Geodiversity research is a growing industry. However, in contrast to diversity studies in other branches of natural sciences, geodiversity specialists have only paid attention to one side of the coin. They focused on the conservation of geological heritage (geoconservation) and its role/use for economic development through geotourism. Most geodiversity experts forgot the more strictly scientific side of the coin such as the use of standard techniques to inventory georesources and analyze their spatial patterns. Furthermore, the lack of a consensual definition with universal classifications and standards to carryout inventories inhibits progress in the inventory and quantification of planetary geodiversity. Even though most definitions of geodiversity include soil resources, pedodiversity is generally ignored in geodiversity research and publications. On the other hand, pedodiversity studies tended to follow the path previously created by biodiversity experts over a period of decades, although they have not convinced policymakers to approve strategies to preserve global soil resources (parks, pedosites, reserves, etc.). Biodiversity studies paid attention to the role of diversity in the structure and function of biocenosis, ecosystems, and biomes, with preservation being placed in the hands of experts in conservation biology. The structure and dynamics of all the Earth surface systems could be analyzed using the standard mathematical tools developed for biodiversity studies and that have been applied with success in pedodiversity analyses. In fact, most of the patterns detected in biodiversity also appear in pedodiversity. According to the canons of the philosophy of science, geodiversity has not reached a paradigm shift, despite the claims of some geodiversity experts. Thus, geodiversity research is at a crossroads as it seeks to reach a genuine paradigm shift.
{"title":"Geodiversity Research at the Crossroads: Two Sides of the Same Coin","authors":"J. Ibáñez, E. Brevik","doi":"10.3389/sjss.2022.10456","DOIUrl":"https://doi.org/10.3389/sjss.2022.10456","url":null,"abstract":"Geodiversity research is a growing industry. However, in contrast to diversity studies in other branches of natural sciences, geodiversity specialists have only paid attention to one side of the coin. They focused on the conservation of geological heritage (geoconservation) and its role/use for economic development through geotourism. Most geodiversity experts forgot the more strictly scientific side of the coin such as the use of standard techniques to inventory georesources and analyze their spatial patterns. Furthermore, the lack of a consensual definition with universal classifications and standards to carryout inventories inhibits progress in the inventory and quantification of planetary geodiversity. Even though most definitions of geodiversity include soil resources, pedodiversity is generally ignored in geodiversity research and publications. On the other hand, pedodiversity studies tended to follow the path previously created by biodiversity experts over a period of decades, although they have not convinced policymakers to approve strategies to preserve global soil resources (parks, pedosites, reserves, etc.). Biodiversity studies paid attention to the role of diversity in the structure and function of biocenosis, ecosystems, and biomes, with preservation being placed in the hands of experts in conservation biology. The structure and dynamics of all the Earth surface systems could be analyzed using the standard mathematical tools developed for biodiversity studies and that have been applied with success in pedodiversity analyses. In fact, most of the patterns detected in biodiversity also appear in pedodiversity. According to the canons of the philosophy of science, geodiversity has not reached a paradigm shift, despite the claims of some geodiversity experts. Thus, geodiversity research is at a crossroads as it seeks to reach a genuine paradigm shift.","PeriodicalId":43464,"journal":{"name":"Spanish Journal of Soil Science","volume":"38 1‐2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41257388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The decomposition of organic matter represents a fundamental pedogenetic process, since it impacts the carbon cycle and the release of nutrients to the soil. However, quantitative research aimed at micro-scale in situ analysis is scarce, despite its relevance in the decomposition process. Therefore, the objectives of this research were to generate discriminating functions of the degrees of organic matter decomposition, based on the brightness values associated with each morphological stage, and from this step, to generate thematic maps. Soil thin sections of forest and compost soils were selected, and petrographic microscope images with three light sources were taken: plane polarized light (PPL), crossed-polarized light (XPL), and crossed polarizers and a retardation plate (gypsum compensator) inserted (XPLλ). Subsequently, the RGB (red, green, blue) image was broken down into three bands, resulting in nine bands for each image. Two thousand sampling points were generated for each band, obtaining brightness values for each decomposed organic matter stage. The points were classified into four categories based on their degree of decomposition: no (A), light (B), moderate (C), and strong (D), in addition to porosity (P). Linear discriminant analysis was performed to obtain classification models for each level of decomposition. The results show that each degree of organic matter decomposition can be highlighted through specific light sources and a set of bands, with an overall accuracy of >94% and kappa coefficients of >0.75 for all classes. In addition, the resulting functions were validated in training images and high-resolution mosaics to create final thematic maps. The use of linear models automated the production and quality of thematic maps at the microscopic level, which can be useful in monitoring the organic matter decomposition process.
{"title":"Brightness Values-Based Discriminant Functions for Classification of Degrees of Organic Matter Decomposition in Soil Thin Sections","authors":"Tania González-Vargas, M. C. Gutiérrez-Castorena","doi":"10.3389/sjss.2022.10348","DOIUrl":"https://doi.org/10.3389/sjss.2022.10348","url":null,"abstract":"The decomposition of organic matter represents a fundamental pedogenetic process, since it impacts the carbon cycle and the release of nutrients to the soil. However, quantitative research aimed at micro-scale in situ analysis is scarce, despite its relevance in the decomposition process. Therefore, the objectives of this research were to generate discriminating functions of the degrees of organic matter decomposition, based on the brightness values associated with each morphological stage, and from this step, to generate thematic maps. Soil thin sections of forest and compost soils were selected, and petrographic microscope images with three light sources were taken: plane polarized light (PPL), crossed-polarized light (XPL), and crossed polarizers and a retardation plate (gypsum compensator) inserted (XPLλ). Subsequently, the RGB (red, green, blue) image was broken down into three bands, resulting in nine bands for each image. Two thousand sampling points were generated for each band, obtaining brightness values for each decomposed organic matter stage. The points were classified into four categories based on their degree of decomposition: no (A), light (B), moderate (C), and strong (D), in addition to porosity (P). Linear discriminant analysis was performed to obtain classification models for each level of decomposition. The results show that each degree of organic matter decomposition can be highlighted through specific light sources and a set of bands, with an overall accuracy of >94% and kappa coefficients of >0.75 for all classes. In addition, the resulting functions were validated in training images and high-resolution mosaics to create final thematic maps. The use of linear models automated the production and quality of thematic maps at the microscopic level, which can be useful in monitoring the organic matter decomposition process.","PeriodicalId":43464,"journal":{"name":"Spanish Journal of Soil Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47098247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Ashrafuzzaman, Cerdà Artemi, F. Santos, Luísa Schmidt
The southwestern coastal regions of Bangladesh (SWCRB) are highly exposed to saltwater intrusions brought about through cyclones and storm surges. These salinity intrusions are contributing to soil and water salinity in the coastal areas. This study aimed to determine the impact of these salinity intrusions on the quality of water and soil in three vulnerable coastal areas. In this investigation, water and soil samples were collected and analysed for pH, electrical conductivity (EC) and other trace elements. The analysis found many of the parameters to be higher than the recommended values. The study found that in soil samples there was a significant correlation between OM and ECe dS/m, as well as K and TN; and a highly significant correlation between TN and OM. This study further examined the historical salinity data at low and high tides to determine any patterns occurring alongside storm surges and cyclones. Water salinity statistics were obtained from the three locations of the Bangladesh Water Development Board (BWDB), which neighbours the study area. A Digital Evaluation Model (DEM) predicts the salinity induced by storm gushes in the corresponding impacted zones. Lastly, the study compared projections for future storm surges at current and predicted sea levels. Potential storm gushes circumstances from 1 to 9 m can impact up to 33% of the nation and 97% of the Shyamnagar Upazila. The occurrence of cyclone-related storms will increase and make cultivation and settlement in the region difficult. The predicted sea-level rises and saltwater contamination will intensify the adverse effects of salinity.
{"title":"Current and Future Salinity Intrusion in the South-Western Coastal Region of Bangladesh","authors":"M. Ashrafuzzaman, Cerdà Artemi, F. Santos, Luísa Schmidt","doi":"10.3389/sjss.2022.10017","DOIUrl":"https://doi.org/10.3389/sjss.2022.10017","url":null,"abstract":"The southwestern coastal regions of Bangladesh (SWCRB) are highly exposed to saltwater intrusions brought about through cyclones and storm surges. These salinity intrusions are contributing to soil and water salinity in the coastal areas. This study aimed to determine the impact of these salinity intrusions on the quality of water and soil in three vulnerable coastal areas. In this investigation, water and soil samples were collected and analysed for pH, electrical conductivity (EC) and other trace elements. The analysis found many of the parameters to be higher than the recommended values. The study found that in soil samples there was a significant correlation between OM and ECe dS/m, as well as K and TN; and a highly significant correlation between TN and OM. This study further examined the historical salinity data at low and high tides to determine any patterns occurring alongside storm surges and cyclones. Water salinity statistics were obtained from the three locations of the Bangladesh Water Development Board (BWDB), which neighbours the study area. A Digital Evaluation Model (DEM) predicts the salinity induced by storm gushes in the corresponding impacted zones. Lastly, the study compared projections for future storm surges at current and predicted sea levels. Potential storm gushes circumstances from 1 to 9 m can impact up to 33% of the nation and 97% of the Shyamnagar Upazila. The occurrence of cyclone-related storms will increase and make cultivation and settlement in the region difficult. The predicted sea-level rises and saltwater contamination will intensify the adverse effects of salinity.","PeriodicalId":43464,"journal":{"name":"Spanish Journal of Soil Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47954871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Daniel Martín Lorenzo, F. J. Rodriguez Tovar, F. M. Martín Peinado
Fire is considered as part of the ecological dynamic in Mediterranean forests and is strongly related to an anthropogenic origin. The aim of this study is to evaluate the evolution of soil properties after a fire in the short term (20 months) by the use of soil quality indicators. The work is based on a multiproxy approach about three basic aspects: 1) the study of changes in soil properties; 2) the estimation of erosion rates; and 3) the evaluation of colonization evolution by soil arthropods through ichnological analysis. Three sectors were selected for this study: a burned and intervened area, a burned and not intervened area, and a reference area. Soil samples were taken randomly from each plot and their main physico-chemical properties analyzed. The assessment of soil erosion was estimated for each plot from three transects (20 m in length) perpendicular to the maximum slope, and the same transects were used for the ichnological study to identify the different bioturbations and the producers. An increase in pH and K values and C/N ratio, and a decrease in total N, available P, CEC, and respiration rate were observed among the fire-affected areas and the reference area; however, there were no significant differences in soil organic carbon. According to erosion, the hydrological correction measures based on the construction of barriers with trunks and branches favored higher runoff and erosion rates in the intervened areas with respect to the not intervened areas. The ichnological analysis showed that arthropods of Formicidae family and Lycosidae sp. genre were the main organisms that recolonized post-fire scenarios; moreover, a lower ichnodiversity is observed in the not intervened area, although with a greater abundance, with respect to the intervened and reference area. According to our results, 20 months after the fire most soil physical-chemical properties did not experiment significant differences in relation to unburned reference area. Our erosion estimation suggested the hydrological correction measures were not appropriate to reduce erosion rates and led to higher soil losses. Moreover, our ichnological study supports the domination by pioneer and opportunist organisms in the recolonization of burned areas.
{"title":"Evaluation of Soil Evolution After a Fire in the Southeast of Spain: A Multiproxy Approach","authors":"Daniel Martín Lorenzo, F. J. Rodriguez Tovar, F. M. Martín Peinado","doi":"10.3389/sjss.2021.10010","DOIUrl":"https://doi.org/10.3389/sjss.2021.10010","url":null,"abstract":"Fire is considered as part of the ecological dynamic in Mediterranean forests and is strongly related to an anthropogenic origin. The aim of this study is to evaluate the evolution of soil properties after a fire in the short term (20 months) by the use of soil quality indicators. The work is based on a multiproxy approach about three basic aspects: 1) the study of changes in soil properties; 2) the estimation of erosion rates; and 3) the evaluation of colonization evolution by soil arthropods through ichnological analysis. Three sectors were selected for this study: a burned and intervened area, a burned and not intervened area, and a reference area. Soil samples were taken randomly from each plot and their main physico-chemical properties analyzed. The assessment of soil erosion was estimated for each plot from three transects (20 m in length) perpendicular to the maximum slope, and the same transects were used for the ichnological study to identify the different bioturbations and the producers. An increase in pH and K values and C/N ratio, and a decrease in total N, available P, CEC, and respiration rate were observed among the fire-affected areas and the reference area; however, there were no significant differences in soil organic carbon. According to erosion, the hydrological correction measures based on the construction of barriers with trunks and branches favored higher runoff and erosion rates in the intervened areas with respect to the not intervened areas. The ichnological analysis showed that arthropods of Formicidae family and Lycosidae sp. genre were the main organisms that recolonized post-fire scenarios; moreover, a lower ichnodiversity is observed in the not intervened area, although with a greater abundance, with respect to the intervened and reference area. According to our results, 20 months after the fire most soil physical-chemical properties did not experiment significant differences in relation to unburned reference area. Our erosion estimation suggested the hydrological correction measures were not appropriate to reduce erosion rates and led to higher soil losses. Moreover, our ichnological study supports the domination by pioneer and opportunist organisms in the recolonization of burned areas.","PeriodicalId":43464,"journal":{"name":"Spanish Journal of Soil Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48557099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Mataix‐Solera, E. Arellano, Jorge E. Jaña, L. Olivares, J. Guardiola, V. Arcenegui, M. García-Carmona, Noelia Garcia-Franco, P. Valenzuela
Wildfires are a common phenomenon globally, nonetheless some ecosystems are more adapted than others. In this work, we show results of a study conducted in Torres del Paine National Park (Chile) that suffered a big forest fire in 2011, affecting 17,666 ha. The Park is located in the transitional forest-steppe zone whose annual rainfall varies between 300 and 1,500 mm. Plant communities goes from Patagonian steppe, pre-Andean scrub to Magellanic forest. Based on vegetation community and trying to cover all representative sectors affected by the fire, 5 areas of the park were sampled in 2019 following the transects where a vegetation recovery study has been monitored since the fire occurred. Soil parameters used to evaluate were: texture, soil water repellency (WR), organic matter (OM), and aggregation, including total content of macroaggregates (TCA) and their stability (AS). The results showed high values of OM, however three of the 5 areas showed statistically lower values of OM in burned samples. WR was present (from slight to severe) in the 75% of the samples, and without differences between burned and unburned. The correlations analyses indicated that WR is more related with the OM type than with quantity, since better correlations were obtained when only samples from the same area were included in the analyses. The results of aggregation indicated that soils have a poor structural development. The TCA varies from 16 to 50%, and the AS is not very high (average of 66%), being the highest in the area with lowest TCA and more affected by the fire and erosion processes. This suggests that the higher values of AS are a consequence of the destruction and loss of the less resistant fraction after the fire. The combination of the high sand content (low specific surface area) and high OM make them very susceptible to develop WR. Since these soils have a scarce development with a poor structure, the combination of the WR and the poor soil structure make them very vulnerable to erosion processes after the fire. Measures to protect the soils or accelerate the recovery are recommended in these areas when new human caused wildfires could occur.
{"title":"Soil Vulnerability Indicators to Degradation by Wildfires in Torres del Paine National Park (Patagonia, Chile)","authors":"J. Mataix‐Solera, E. Arellano, Jorge E. Jaña, L. Olivares, J. Guardiola, V. Arcenegui, M. García-Carmona, Noelia Garcia-Franco, P. Valenzuela","doi":"10.3389/sjss.2021.10008","DOIUrl":"https://doi.org/10.3389/sjss.2021.10008","url":null,"abstract":"Wildfires are a common phenomenon globally, nonetheless some ecosystems are more adapted than others. In this work, we show results of a study conducted in Torres del Paine National Park (Chile) that suffered a big forest fire in 2011, affecting 17,666 ha. The Park is located in the transitional forest-steppe zone whose annual rainfall varies between 300 and 1,500 mm. Plant communities goes from Patagonian steppe, pre-Andean scrub to Magellanic forest. Based on vegetation community and trying to cover all representative sectors affected by the fire, 5 areas of the park were sampled in 2019 following the transects where a vegetation recovery study has been monitored since the fire occurred. Soil parameters used to evaluate were: texture, soil water repellency (WR), organic matter (OM), and aggregation, including total content of macroaggregates (TCA) and their stability (AS). The results showed high values of OM, however three of the 5 areas showed statistically lower values of OM in burned samples. WR was present (from slight to severe) in the 75% of the samples, and without differences between burned and unburned. The correlations analyses indicated that WR is more related with the OM type than with quantity, since better correlations were obtained when only samples from the same area were included in the analyses. The results of aggregation indicated that soils have a poor structural development. The TCA varies from 16 to 50%, and the AS is not very high (average of 66%), being the highest in the area with lowest TCA and more affected by the fire and erosion processes. This suggests that the higher values of AS are a consequence of the destruction and loss of the less resistant fraction after the fire. The combination of the high sand content (low specific surface area) and high OM make them very susceptible to develop WR. Since these soils have a scarce development with a poor structure, the combination of the WR and the poor soil structure make them very vulnerable to erosion processes after the fire. Measures to protect the soils or accelerate the recovery are recommended in these areas when new human caused wildfires could occur.","PeriodicalId":43464,"journal":{"name":"Spanish Journal of Soil Science","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42309871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-03-13DOI: 10.3232/SJSS.2021.V11.N1.03
Kamel Ghadernejad, Gholamhossein Shahgholi, A. Mardani, M. Maleki
One of the important factors that can control and decrease soil compaction is incorporation farmyard manure to the soil. It increases soil elasticity and soil tolerance to the imported load. To evaluate the farmyard manure effect on the soil compaction, it was incorporated in the clay soil at different rates of 0, 45, 60, and 90 Mg ha-1. Tests were conducted at different tire passes of 1, 6, 11 and 16 on the same track at three soil moisture contents of 8%, 11% and 14% (dry base); soil bulk density was measured at depths of 10, 20, and 30 cm. To evaluate soil compaction, cylindrical cores were employed to measure the soil bulk density. To assess soil behavior during the soil compaction process, three displacement transducers were placed in the soil in three coordinate directions of x, y and z. The soil volumetric change was measured using the transducers and soil sinkage was also measured. A single-wheel tester was used in a soil bin with a Barez 8.25-16 (8) P.R HLF agricultural tractor tire operated at a forward velocity of 0.8 m s-1 under a vertical load of 4 kN and an inflation pressure of 300 kPa. Incorporating the farmyard manure noticeably decreased the final vertical and longitudinal displacement below the tire track, while the lateral displacement increased. Bulk density decrements of 14.7%, 9.7% and 6.3% were occurred via farmyard manure application rates of 90, 60 and 45 Mg ha-1, respectively. Maximum soil sinkage occurred at 14% moisture, 16 passes of tire and with no manure condition.
{"title":"Investigating the effect of farmyard manure on clay soil compactibility","authors":"Kamel Ghadernejad, Gholamhossein Shahgholi, A. Mardani, M. Maleki","doi":"10.3232/SJSS.2021.V11.N1.03","DOIUrl":"https://doi.org/10.3232/SJSS.2021.V11.N1.03","url":null,"abstract":"One of the important factors that can control and decrease soil compaction is incorporation farmyard manure to the soil. It increases soil elasticity and soil tolerance to the imported load. To evaluate the farmyard manure effect on the soil compaction, it was incorporated in the clay soil at different rates of 0, 45, 60, and 90 Mg ha-1. Tests were conducted at different tire passes of 1, 6, 11 and 16 on the same track at three soil moisture contents of 8%, 11% and 14% (dry base); soil bulk density was measured at depths of 10, 20, and 30 cm. To evaluate soil compaction, cylindrical cores were employed to measure the soil bulk density. To assess soil behavior during the soil compaction process, three displacement transducers were placed in the soil in three coordinate directions of x, y and z. The soil volumetric change was measured using the transducers and soil sinkage was also measured. A single-wheel tester was used in a soil bin with a Barez 8.25-16 (8) P.R HLF agricultural tractor tire operated at a forward velocity of 0.8 m s-1 under a vertical load of 4 kN and an inflation pressure of 300 kPa. Incorporating the farmyard manure noticeably decreased the final vertical and longitudinal displacement below the tire track, while the lateral displacement increased. Bulk density decrements of 14.7%, 9.7% and 6.3% were occurred via farmyard manure application rates of 90, 60 and 45 Mg ha-1, respectively. Maximum soil sinkage occurred at 14% moisture, 16 passes of tire and with no manure condition.","PeriodicalId":43464,"journal":{"name":"Spanish Journal of Soil Science","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42689664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-03-13DOI: 10.3232/sjss.2021.v11.n1.04
M. Panettieri, M. Jiménez-González, L. L. Sosa, G. Almendros, E. Madejón
Increasing food production while avoiding the progressive degradation of agricultural soils has become one of the major challenges at a global level. In consequence, the development of sustainable tillage methodologies or cultivation strategies is an important subject of current research. In fact, it has been observed that the implementation of reduced tillage (RT) vs. traditional tillage (TT) in the long term not only improves soil physicochemical properties but also global soil quality in terms of soil health. In particular, the increase of the soil organic carbon (SOC) content under RT conditions is one of the most important factors, but there is little information about the chemical composition and humification level of this carbon, and thus about its persistence at long-term. This is of particular importance considering the policies of carbon sequestration and climate change mitigation, such as the “4 per 1000” initiative. In this study, molecular-level characterization of the humic acid (HA) and fulvic acid (FA) fractions isolated from a soil after 19 years under RT and TT practices was carried out. This study would provide objective descriptors of the impact of these two tillage practices in the chemical composition of the resulting SOC. With this purpose, the potential of Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FTICR-MS) for assessing changes in the molecular assemblages released from the humic fractions (HA and FA) was examined. The results showed enhanced diversity and chemical richness (expressed as number of molecular formulas) in the composition of SOC under RT. Different tillage-specific compound classes were associated with both tillage practices. As a whole, the humic fraction showed a higher proportion of molecular formulas for lipid and hydroaromatic families in the case of RT compared to TT, while the same fraction under TT showed a greater richness of oxidized protein-derived formulas than RT. In the case of FAs, a similar pattern was observed for hydroaromatic and protein-derived formulas, but the proportion of molecular formulas assigned to unsaturated lipids was higher in TT than in RT. In addition, increased number of formulas for aromatic and condensed aromatic compounds was observed in FAs under TT respect to RT.
{"title":"Chemical diversity and molecular signature of soil humic fractions used as proxies of soil quality under contrasted tillage management","authors":"M. Panettieri, M. Jiménez-González, L. L. Sosa, G. Almendros, E. Madejón","doi":"10.3232/sjss.2021.v11.n1.04","DOIUrl":"https://doi.org/10.3232/sjss.2021.v11.n1.04","url":null,"abstract":"Increasing food production while avoiding the progressive degradation of agricultural soils has become one of the major challenges at a global level. In consequence, the development of sustainable tillage methodologies or cultivation strategies is an important subject of current research. In fact, it has been observed that the implementation of reduced tillage (RT) vs. traditional tillage (TT) in the long term not only improves soil physicochemical properties but also global soil quality in terms of soil health. In particular, the increase of the soil organic carbon (SOC) content under RT conditions is one of the most important factors, but there is little information about the chemical composition and humification level of this carbon, and thus about its persistence at long-term. This is of particular importance considering the policies of carbon sequestration and climate change mitigation, such as the “4 per 1000” initiative. In this study, molecular-level characterization of the humic acid (HA) and fulvic acid (FA) fractions isolated from a soil after 19 years under RT and TT practices was carried out. This study would provide objective descriptors of the impact of these two tillage practices in the chemical composition of the resulting SOC. With this purpose, the potential of Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FTICR-MS) for assessing changes in the molecular assemblages released from the humic fractions (HA and FA) was examined. The results showed enhanced diversity and chemical richness (expressed as number of molecular formulas) in the composition of SOC under RT. Different tillage-specific compound classes were associated with both tillage practices. As a whole, the humic fraction showed a higher proportion of molecular formulas for lipid and hydroaromatic families in the case of RT compared to TT, while the same fraction under TT showed a greater richness of oxidized protein-derived formulas than RT. In the case of FAs, a similar pattern was observed for hydroaromatic and protein-derived formulas, but the proportion of molecular formulas assigned to unsaturated lipids was higher in TT than in RT. In addition, increased number of formulas for aromatic and condensed aromatic compounds was observed in FAs under TT respect to RT.","PeriodicalId":43464,"journal":{"name":"Spanish Journal of Soil Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43927599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-03-13DOI: 10.3232/SJSS.2021.V11.N1.02
X. Úbeda, M. Francos, Pablo Eguzkiza, E. B. Stefanuto
The soil from three organically cultivated plots in Rioja Alavesa vineyards, specifically in Lanciego (Álava, Spain), and the foliage of their vines were analyzed. The aim of this study was to determine differences in soil and grapevine quality between different aged vineyards. The first 20 centimeters of the soil were sampled and leaves were collected during the growing season. The results show that the quality of the soil in the three plots was optimal and did not differ from reported values of soils from traditionally cultivated plots. The only element found at a lower concentration in the three plots and the leaves was iron. Organic cultivation of vineyards is a viable mode of cultivation and could help reduce greenhouse gas emissions and contamination by pesticides and fertilizers.
{"title":"Soil and grapevine leaf quality in organic vineyards of different ages in DO Rioja-Alavesa, northern Spain","authors":"X. Úbeda, M. Francos, Pablo Eguzkiza, E. B. Stefanuto","doi":"10.3232/SJSS.2021.V11.N1.02","DOIUrl":"https://doi.org/10.3232/SJSS.2021.V11.N1.02","url":null,"abstract":"The soil from three organically cultivated plots in Rioja Alavesa vineyards, specifically in Lanciego (Álava, Spain), and the foliage of their vines were analyzed. The aim of this study was to determine differences in soil and grapevine quality between different aged vineyards. The first 20 centimeters of the soil were sampled and leaves were collected during the growing season. The results show that the quality of the soil in the three plots was optimal and did not differ from reported values of soils from traditionally cultivated plots. The only element found at a lower concentration in the three plots and the leaves was iron. Organic cultivation of vineyards is a viable mode of cultivation and could help reduce greenhouse gas emissions and contamination by pesticides and fertilizers.","PeriodicalId":43464,"journal":{"name":"Spanish Journal of Soil Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45223641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-03-13DOI: 10.3232/SJSS.2021.V11.N1.01
P. Baveye
Soil “biofilms”: “Bioclusters” would be a much better descriptor
土壤“生物膜”：“生物集群”是一个更好的描述词
{"title":"Soil “biofilms”: “Bioclusters” would be a much better descriptor","authors":"P. Baveye","doi":"10.3232/SJSS.2021.V11.N1.01","DOIUrl":"https://doi.org/10.3232/SJSS.2021.V11.N1.01","url":null,"abstract":"Soil “biofilms”: “Bioclusters” would be a much better descriptor","PeriodicalId":43464,"journal":{"name":"Spanish Journal of Soil Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44144330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-03-13DOI: 10.3232/SJSS.2021.V11.N1.05
Leticia Salomé Jiménez Álvarez, Edwin Andrade, Edwin Daniel Capa Mora, Natacha del Cisne Fierro Jaramillo, Pablo Geovanny Quichimbo Miguitama, Wilmer Jiménez, Humberto Vinicio Carrión Paladines
Local farmers' knowledge of edaphic fertility indicators is a decisive factor for decision making and sustainable soil management. Thus, the purpose of this study was to determine soil fertility indicators according to the criteria of small farmers and contrast it with scientific knowledge. A field study was developed in northern Ecuador, where 95 semi-structured surveys were applied to farm owners in the Andean and Subtropical zones. Each questionnaire grouped several questions with topics such as plant indicators of soil fertility, physical indicators of soil fertility, forms of soil degradation and conservation strategies, as well as the acquisition of knowledge over time according to farmers' perception. Farmers consider that crops are indicators of soil fertility, while the presence of “weeds” indicate poor soils. Additionally, characteristics like color, texture, stoniness, depth, the presence of macrofauna and crop yield indicated soil fertility. Also, farmers are aware of the soil's contamination and of conservation strategies available to avoid this; however, since their main objective is to improve crop yield and not precisely soil conservation, they do not always apply these strategies. Some of these practices are transmitted from one generation to the next and are at risk of being lost, hence the importance of integrating farmers’ perception and scientific knowledge to generate guidelines for sustainable soil management.
{"title":"Traditional knowledge on soil management and conservation in the inter-Andean region, northern Ecuador","authors":"Leticia Salomé Jiménez Álvarez, Edwin Andrade, Edwin Daniel Capa Mora, Natacha del Cisne Fierro Jaramillo, Pablo Geovanny Quichimbo Miguitama, Wilmer Jiménez, Humberto Vinicio Carrión Paladines","doi":"10.3232/SJSS.2021.V11.N1.05","DOIUrl":"https://doi.org/10.3232/SJSS.2021.V11.N1.05","url":null,"abstract":"Local farmers' knowledge of edaphic fertility indicators is a decisive factor for decision making and sustainable soil management. Thus, the purpose of this study was to determine soil fertility indicators according to the criteria of small farmers and contrast it with scientific knowledge. A field study was developed in northern Ecuador, where 95 semi-structured surveys were applied to farm owners in the Andean and Subtropical zones. Each questionnaire grouped several questions with topics such as plant indicators of soil fertility, physical indicators of soil fertility, forms of soil degradation and conservation strategies, as well as the acquisition of knowledge over time according to farmers' perception. Farmers consider that crops are indicators of soil fertility, while the presence of “weeds” indicate poor soils. Additionally, characteristics like color, texture, stoniness, depth, the presence of macrofauna and crop yield indicated soil fertility. Also, farmers are aware of the soil's contamination and of conservation strategies available to avoid this; however, since their main objective is to improve crop yield and not precisely soil conservation, they do not always apply these strategies. Some of these practices are transmitted from one generation to the next and are at risk of being lost, hence the importance of integrating farmers’ perception and scientific knowledge to generate guidelines for sustainable soil management.","PeriodicalId":43464,"journal":{"name":"Spanish Journal of Soil Science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44762104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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