Plant leaf litter decomposition provides a source of energy and nutrients in forest ecosystems. In addition to traditional environmental factors, the degradation process of litter is also affected by plant functional traits and litter quality. However, at the community level, it is still unclear whether the relative importance of plant traits and litter quality on the litter decomposition rate is consistent. A year-long mixed leaf litter decomposition experiment in a similar environment was implemented by using the litterbag method in seven typical forest types in Dongling Mountain, Beijing, North China, including six monodominant communities dominated by Juglans mandshurica, Populus cathayana, Betula dahurica, B. platyphylla, Pinus tabuliformis and Larix gmelinii var. principis-rupprechtii and one codominant community dominated by Fraxinus rhynchophylla, Quercus mongolica and Tilia mongolica. The results showed that there were considerable differences in the litter decomposition rate (k-rate) among the different forest types. The community weighted mean (CWM) traits of green leaves and litter quality explained 35.60% and 9.05% of the k-rate variations, respectively, and the interpretation rate of their interaction was 23.37%, indicating that the CWM traits and their interaction with litter quality were the main factors affecting the k-rate variations. In the RDA, leaf nitrogen content, leaf dry matter content, leaf tannin content and specific leaf area were the main factors affecting the k-rate variations. Therefore, we suggest that future studies should focus on the effects of the CWM traits of green leaves on litter decomposition at the community level.
{"title":"Leaf litter decomposition characteristics and controlling factors across two contrasting forest types","authors":"Yuanfeng Zhao, Zhuo-Ting Li, Ting Xu, A. Lou","doi":"10.1093/jpe/rtac073","DOIUrl":"https://doi.org/10.1093/jpe/rtac073","url":null,"abstract":"\u0000 Plant leaf litter decomposition provides a source of energy and nutrients in forest ecosystems. In addition to traditional environmental factors, the degradation process of litter is also affected by plant functional traits and litter quality. However, at the community level, it is still unclear whether the relative importance of plant traits and litter quality on the litter decomposition rate is consistent. A year-long mixed leaf litter decomposition experiment in a similar environment was implemented by using the litterbag method in seven typical forest types in Dongling Mountain, Beijing, North China, including six monodominant communities dominated by Juglans mandshurica, Populus cathayana, Betula dahurica, B. platyphylla, Pinus tabuliformis and Larix gmelinii var. principis-rupprechtii and one codominant community dominated by Fraxinus rhynchophylla, Quercus mongolica and Tilia mongolica. The results showed that there were considerable differences in the litter decomposition rate (k-rate) among the different forest types. The community weighted mean (CWM) traits of green leaves and litter quality explained 35.60% and 9.05% of the k-rate variations, respectively, and the interpretation rate of their interaction was 23.37%, indicating that the CWM traits and their interaction with litter quality were the main factors affecting the k-rate variations. In the RDA, leaf nitrogen content, leaf dry matter content, leaf tannin content and specific leaf area were the main factors affecting the k-rate variations. Therefore, we suggest that future studies should focus on the effects of the CWM traits of green leaves on litter decomposition at the community level.","PeriodicalId":50085,"journal":{"name":"Journal of Plant Ecology","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2022-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48293042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Previous studies showed that moss stoichiometric characteristics were influenced by moss patch size, shrubs and the environment in the desert. The study of moss stoichiometry in different spatial distribution areas is crucial for an understanding of growth and adaptation strategy of the mosses. In this study, the dominant moss (Syntrichia caninervis Mitt.) of biological soil crusts, and soil under the moss patches in the Gurbantunggut Desert were selected to determine their stoichiometry in different dunes and sites. Moss stoichiometry and soil available nutrients were significantly influenced by different distribution areas except for moss C. The Naboveground vs. Nbelowground, Paboveground vs. Pbelowground, and Kaboveground vs. Kbelowground scaling exponents of moss were 0.251, 0.389, 0.442, respectively. The N vs. P scaling exponents were 0.71, 0.84 in above- and below-ground parts of moss. Moss stoichiometry was disproportionately distributed in the above-ground and below-ground parts. Moreover, moss N, P and K elements were influenced by mean annual precipitation (MAP), longitude and soil nutrients. The nutrients of moss were affected by spatial distribution, mean annual temperature (MAT), MAP and soil nutrients. The growth of moss was limited by N element in the temperate desert. This study provides the stoichiometric characteristics of C, N, P and K of moss at different spatial scales, and explores their relationships with environmental variables, which can help understand nutrient patterns and utilization strategy of N, P and K, and their potential responses to global climate changes in desert.
{"title":"Moss C, N, P and K stoichiometry and their relationships are related to soil nutrients and environment in a temperate desert of central Asia","authors":"Yonggang Li, Xiaobing Zhou, Yongxing Lu, Yuanming Zhang","doi":"10.1093/jpe/rtac070","DOIUrl":"https://doi.org/10.1093/jpe/rtac070","url":null,"abstract":"\u0000 Previous studies showed that moss stoichiometric characteristics were influenced by moss patch size, shrubs and the environment in the desert. The study of moss stoichiometry in different spatial distribution areas is crucial for an understanding of growth and adaptation strategy of the mosses. In this study, the dominant moss (Syntrichia caninervis Mitt.) of biological soil crusts, and soil under the moss patches in the Gurbantunggut Desert were selected to determine their stoichiometry in different dunes and sites. Moss stoichiometry and soil available nutrients were significantly influenced by different distribution areas except for moss C. The Naboveground vs. Nbelowground, Paboveground vs. Pbelowground, and Kaboveground vs. Kbelowground scaling exponents of moss were 0.251, 0.389, 0.442, respectively. The N vs. P scaling exponents were 0.71, 0.84 in above- and below-ground parts of moss. Moss stoichiometry was disproportionately distributed in the above-ground and below-ground parts. Moreover, moss N, P and K elements were influenced by mean annual precipitation (MAP), longitude and soil nutrients. The nutrients of moss were affected by spatial distribution, mean annual temperature (MAT), MAP and soil nutrients. The growth of moss was limited by N element in the temperate desert. This study provides the stoichiometric characteristics of C, N, P and K of moss at different spatial scales, and explores their relationships with environmental variables, which can help understand nutrient patterns and utilization strategy of N, P and K, and their potential responses to global climate changes in desert.","PeriodicalId":50085,"journal":{"name":"Journal of Plant Ecology","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2022-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46645882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bayesian belief networks (BBN) have been increasingly used as a potential decision supporting tool useful in conservation management. We assessed the application of the BBN model to support management in conservation planning of Pulsatilla patens (L.) Mill., the endangered plant species on a European scale, as an example. The Bayesian network approach was used to develop a model of the impact of biotic and abiotic variables on the morphological-developmental features and demographic features of the population in NE Poland. Field data collected from the total number of 47 sites in the 4 largest forest complexes were used to develop a model using GeNIe 2.0. The diagnostic testing and sensitivity analysis indicated that the greatest impact on the population features was the number of competing species in the forest undergrowth. Validation has shown that the developed model is effective for evaluation of the impact of habitat conditions on the population features deciding about the reproduction of this taxon. The BBN model was also used to define optimal habitat conditions ensuring regular growth and development of P. patens. Finally, we indicated the protective treatment to help preserving the species considered. Therefore, the developed model is recommended as a potential tool to support decision-making aimed at the conservation planning of endangered plant species.
{"title":"Bayesian belief networks - a potential tool for conservation planning of endangered plant species populations","authors":"A. Sienkiewicz, G. Łaska","doi":"10.1093/jpe/rtac071","DOIUrl":"https://doi.org/10.1093/jpe/rtac071","url":null,"abstract":"\u0000 Bayesian belief networks (BBN) have been increasingly used as a potential decision supporting tool useful in conservation management. We assessed the application of the BBN model to support management in conservation planning of Pulsatilla patens (L.) Mill., the endangered plant species on a European scale, as an example. The Bayesian network approach was used to develop a model of the impact of biotic and abiotic variables on the morphological-developmental features and demographic features of the population in NE Poland. Field data collected from the total number of 47 sites in the 4 largest forest complexes were used to develop a model using GeNIe 2.0. The diagnostic testing and sensitivity analysis indicated that the greatest impact on the population features was the number of competing species in the forest undergrowth. Validation has shown that the developed model is effective for evaluation of the impact of habitat conditions on the population features deciding about the reproduction of this taxon. The BBN model was also used to define optimal habitat conditions ensuring regular growth and development of P. patens. Finally, we indicated the protective treatment to help preserving the species considered. Therefore, the developed model is recommended as a potential tool to support decision-making aimed at the conservation planning of endangered plant species.","PeriodicalId":50085,"journal":{"name":"Journal of Plant Ecology","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43831532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Native herbivory may be detrimental to plant fitness and thus can contribute a biotic resistance to exotic plant invasion. Eupatorium adenophorum Sprengel, a non-native species, has formed dense monocultures in many southern Provinces of China. Because several native generalist insects feed on E. adenophorum, we evaluated whether the lower level of induced defences and greater compensatory growth contributed to successful invasion of E. adenophorum by comparison with a native congener E. heterophyllum. Early events in the jasmonic acid (JA) cascade and chlorophyll fluorescence, non-target metabolomic profiles, and recovery in biomass compensation of E. adenophorum and its native congener E. heterophyllum were measured during mechanical wounding and herbivory by the generalist insect Helicoverpa armigera. Mechanical and simulated chewing damage immediately initiated defences in the two species. However, E. heterophyllum was more sensitive to tissue loss, and it produced more metabolic defensive compounds than invasive E. adenophorum. Although H. armigera feeding amplified the effects of mechanical wounding on defence induction, the biomass of E. adenophorum was only weakly affected, as its higher compensatory growth could offset the biomass loss and metabolic cost. Overall, our results suggested that H. armigera herbivory and mechanical wounding could induce different physiological responses, and were often specific to invasive E. adenophorum and native E. heterophyllum. Moreover, lower metabolic defences and higher compensation growth may contribute to the invasion success of E. adenophorum.
{"title":"Low-level expression of induced defences and increased compensation in Eupatorium adenophorum relative to its native congeneric plant to mechanical wounding and insect herbivory","authors":"Rui-fang Wang, Z. Liao, Weitao Li, Chunyuan Zhang, Han-Bo Zhang, Yu-long Zheng","doi":"10.1093/jpe/rtac069","DOIUrl":"https://doi.org/10.1093/jpe/rtac069","url":null,"abstract":"\u0000 Native herbivory may be detrimental to plant fitness and thus can contribute a biotic resistance to exotic plant invasion. Eupatorium adenophorum Sprengel, a non-native species, has formed dense monocultures in many southern Provinces of China. Because several native generalist insects feed on E. adenophorum, we evaluated whether the lower level of induced defences and greater compensatory growth contributed to successful invasion of E. adenophorum by comparison with a native congener E. heterophyllum. Early events in the jasmonic acid (JA) cascade and chlorophyll fluorescence, non-target metabolomic profiles, and recovery in biomass compensation of E. adenophorum and its native congener E. heterophyllum were measured during mechanical wounding and herbivory by the generalist insect Helicoverpa armigera. Mechanical and simulated chewing damage immediately initiated defences in the two species. However, E. heterophyllum was more sensitive to tissue loss, and it produced more metabolic defensive compounds than invasive E. adenophorum. Although H. armigera feeding amplified the effects of mechanical wounding on defence induction, the biomass of E. adenophorum was only weakly affected, as its higher compensatory growth could offset the biomass loss and metabolic cost. Overall, our results suggested that H. armigera herbivory and mechanical wounding could induce different physiological responses, and were often specific to invasive E. adenophorum and native E. heterophyllum. Moreover, lower metabolic defences and higher compensation growth may contribute to the invasion success of E. adenophorum.","PeriodicalId":50085,"journal":{"name":"Journal of Plant Ecology","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45993148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bowen Li, Jianping Sun, Shiping Wang, Wangwang Lv, Yang Zhou, Peipei Liu, Qi Wang, Wang A, Suren Zhang, Lu Xia, Huan Hong, Li-li Jiang, C. Luo, Zhenhua Zhang, S. Piao, Yanfen Wang, T. Dorji
There is a debate about unmatched results between manipulative warming using constant warming rates every year (CW) and long-term observations warming affect temperature sensitive of flowering phenology, and it is probable because that long-term observations could represent the actual yearly increase in temperature (i.e., a yearly stepwise warming rate per year, SW) which would differ from CW and their effects would be regulated by precipitation alteration. Here we conducted a warming experiment with CW (temperature increase by +1 ºC and sustained this elevated temperature for the duration of the study) and SW (temperature increase by + 0.25 ºC progressively each year) with precipitation addition in an alpine grassland for four years. Our results showed that neither warming rates affected community flowering phenology. However, precipitation addition advanced onsets of flowering for early-spring flowering (ESF) and mid-summer flowering (MSF) groups, and advanced the end date of flowering for ESF but delayed it for the MSF group. Thus, flowering duration remained stable for the ESF group and was prolonged for the MSF group, and further prolonged the flowering duration of the community. There were no interactions between warming rates and precipitation addition on the community flowering phenology. A severe drought in a year significantly decreased the maximum number of community flowers the following year. Therefore, change in precipitation has a greater effect than warming on the community flowering phenology in the semi-arid alpine grassland.
{"title":"Greater responses of flower phenology of Kobresia pygmaea community to precipitation addition than to constant and stepwise warming","authors":"Bowen Li, Jianping Sun, Shiping Wang, Wangwang Lv, Yang Zhou, Peipei Liu, Qi Wang, Wang A, Suren Zhang, Lu Xia, Huan Hong, Li-li Jiang, C. Luo, Zhenhua Zhang, S. Piao, Yanfen Wang, T. Dorji","doi":"10.1093/jpe/rtac066","DOIUrl":"https://doi.org/10.1093/jpe/rtac066","url":null,"abstract":"\u0000 There is a debate about unmatched results between manipulative warming using constant warming rates every year (CW) and long-term observations warming affect temperature sensitive of flowering phenology, and it is probable because that long-term observations could represent the actual yearly increase in temperature (i.e., a yearly stepwise warming rate per year, SW) which would differ from CW and their effects would be regulated by precipitation alteration. Here we conducted a warming experiment with CW (temperature increase by +1 ºC and sustained this elevated temperature for the duration of the study) and SW (temperature increase by + 0.25 ºC progressively each year) with precipitation addition in an alpine grassland for four years. Our results showed that neither warming rates affected community flowering phenology. However, precipitation addition advanced onsets of flowering for early-spring flowering (ESF) and mid-summer flowering (MSF) groups, and advanced the end date of flowering for ESF but delayed it for the MSF group. Thus, flowering duration remained stable for the ESF group and was prolonged for the MSF group, and further prolonged the flowering duration of the community. There were no interactions between warming rates and precipitation addition on the community flowering phenology. A severe drought in a year significantly decreased the maximum number of community flowers the following year. Therefore, change in precipitation has a greater effect than warming on the community flowering phenology in the semi-arid alpine grassland.","PeriodicalId":50085,"journal":{"name":"Journal of Plant Ecology","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2022-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43945361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The four alien farmland weeds of genus Veronica (i.e., V. arvensis, V. didyma, V. hederifolia, and V. persica) have successfully colonized in China, but caused different ecological consequences in the colonized habitats. However, the key biological traits conferring to bio-invasion differences under different light conditions among the four alien species of Veronica remain unknown. A comprehensive contrastive analysis experiment was conducted to assess the contribution intensity of photosynthetic and sexual and asexual reproductive traits of the four alien Veronica weeds to their invasion level in both field trial and laboratory. The field survey results showed that V. persica had the highest invasion level, V. didyma, V. hederifolia and V. arvensis in turn. Their invasiveness were mainly attributed to photosynthetic-related parameters (LMA) and asexual reproduction traits (the ratio of adventitious root) out of all the 22 tested indexes. The photosynthetic-related and some asexual reproduction indexes from separated determinations under both sun and shade conditions showed that V. persica was able to adapt strong illumination but more tolerant to the shade than the other species. This adaptive differentiation to illumination conferred the four alien Veronica weeds to different competitiveness to crops through allocating resource to the biomass of each organ in farmland. It may conclude that the adaptability to illumination conditions and the asexual reproduction traits may endow their successful invasion and become different important farmland weeds.
{"title":"A comparative study reveals the key biological traits causing bioinvasion difference among four alien species of genus Veronica in China","authors":"Yujing Liu, Hairong Wu, Cong-yan Wang, Jiliang Cheng, Shengze Qiang","doi":"10.1093/jpe/rtac068","DOIUrl":"https://doi.org/10.1093/jpe/rtac068","url":null,"abstract":"\u0000 The four alien farmland weeds of genus Veronica (i.e., V. arvensis, V. didyma, V. hederifolia, and V. persica) have successfully colonized in China, but caused different ecological consequences in the colonized habitats. However, the key biological traits conferring to bio-invasion differences under different light conditions among the four alien species of Veronica remain unknown. A comprehensive contrastive analysis experiment was conducted to assess the contribution intensity of photosynthetic and sexual and asexual reproductive traits of the four alien Veronica weeds to their invasion level in both field trial and laboratory. The field survey results showed that V. persica had the highest invasion level, V. didyma, V. hederifolia and V. arvensis in turn. Their invasiveness were mainly attributed to photosynthetic-related parameters (LMA) and asexual reproduction traits (the ratio of adventitious root) out of all the 22 tested indexes. The photosynthetic-related and some asexual reproduction indexes from separated determinations under both sun and shade conditions showed that V. persica was able to adapt strong illumination but more tolerant to the shade than the other species. This adaptive differentiation to illumination conferred the four alien Veronica weeds to different competitiveness to crops through allocating resource to the biomass of each organ in farmland. It may conclude that the adaptability to illumination conditions and the asexual reproduction traits may endow their successful invasion and become different important farmland weeds.","PeriodicalId":50085,"journal":{"name":"Journal of Plant Ecology","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2022-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46636686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Seed dormancy ensures seedling will establish in the favorable season in a seasonally changing environment. Korean pine seeds have morphophysiological dormancy after dispersal in autumn. A small fraction of seeds germinates in the first spring, but most seeds germinate in the second spring following dispersal. It is not clear how dormancy status changes and thus drives germination characteristic. Fresh Korean pine seeds were buried between litterfall and soil in Fenglin National Nature Reserves, Heilongjiang province, Northeastern China, in middle October 2018 and regularly exhumed. Field germination percentage, embryo growth, seed viability and laboratory germination percentage of exhumed seeds were determined. The physiological dormancy part of morphophysiological dormancy was gradually released during the first winter, but re-induced in the first summer following dispersal. The re-induced physiological dormancy was broken again in the second autumn and winter. The morphological dormancy part of morphophysiological dormancy was slowly released over the first summer but rapidly broken during the second early and middle autumn. In the second spring, Korean pine seeds completely escaped from morphophysiological dormancy. The physiological dormancy part of morphophysiological dormancy was completely released, but the morphological dormancy part was still maintained, leading to very low germination in the first spring in the field. Relief of morphophysiological dormancy enables a high percentage of seeds to germinate at relatively low temperature (alternating day/night temperature above 10/5°C) in the second spring. Korean pine provides an example of the change in dormancy status of seeds with morphophysiological dormancy.
{"title":"Change in seed dormancy status controls seasonal timing of seed germination in Pinus koraiensis Sieb. et Zucc","authors":"Yuan Song, M. Zhang, Yun Guo, Xiaoye Gao","doi":"10.1093/jpe/rtac067","DOIUrl":"https://doi.org/10.1093/jpe/rtac067","url":null,"abstract":"\u0000 Seed dormancy ensures seedling will establish in the favorable season in a seasonally changing environment. Korean pine seeds have morphophysiological dormancy after dispersal in autumn. A small fraction of seeds germinates in the first spring, but most seeds germinate in the second spring following dispersal. It is not clear how dormancy status changes and thus drives germination characteristic. Fresh Korean pine seeds were buried between litterfall and soil in Fenglin National Nature Reserves, Heilongjiang province, Northeastern China, in middle October 2018 and regularly exhumed. Field germination percentage, embryo growth, seed viability and laboratory germination percentage of exhumed seeds were determined. The physiological dormancy part of morphophysiological dormancy was gradually released during the first winter, but re-induced in the first summer following dispersal. The re-induced physiological dormancy was broken again in the second autumn and winter. The morphological dormancy part of morphophysiological dormancy was slowly released over the first summer but rapidly broken during the second early and middle autumn. In the second spring, Korean pine seeds completely escaped from morphophysiological dormancy. The physiological dormancy part of morphophysiological dormancy was completely released, but the morphological dormancy part was still maintained, leading to very low germination in the first spring in the field. Relief of morphophysiological dormancy enables a high percentage of seeds to germinate at relatively low temperature (alternating day/night temperature above 10/5°C) in the second spring. Korean pine provides an example of the change in dormancy status of seeds with morphophysiological dormancy.","PeriodicalId":50085,"journal":{"name":"Journal of Plant Ecology","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2022-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45221349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The ecosystem apparent quantum yield (α), maximum rate of gross CO2 assimilation (Pmax), and daytime ecosystem respiration rate (Rd) reflecting the physiological functioning of ecosystem, are vital photosynthetic parameters for the estimation of ecosystem carbon budget. Climatic drivers may affect photosynthetic parameters both directly and indirectly by altering the response of vegetation. However, the relative contribution and regulation pathway of environmental and physiological controls remain unclear, especially in semi-arid grasslands. We analyzed seasonal and interannual variations of photosynthetic parameters derived from eddy-covariance observation in a typical semi-arid grassland in Inner Mongolia, northern China, over 12 years from 2006 to 2017. Regression analyses and a structural equation model (SEM) were adopted to separate the contributions of environmental and physiological effects. The photosynthetic parameters showed unimodal seasonal patterns and significantly interannual variations. Variations of air temperature (Ta) and soil water content (SWC) drove the seasonal patterns of photosynthetic parameters, while SWC predominated their interannual variations. Moreover, contrasting with the predominant role of Ta on α and Rd, SWC explained more variances of Pmax than Ta. Results of SEM elucidated that environmental factors impacted photosynthetic parameters both directly and indirectly through regulating physiological responses reflected by stomatal conductance at the canopy level. Moreover, leaf area index (LAI) directly affected α, Pmax and Rd and dominated the variation of Pmax. On the other hand, SWC influenced photosynthetic parameters indirectly through LAI and canopy surface conductance (gc). Our finding highlights the importance of physiological regulation on the photosynthetic parameters and carbon assimilation capacity, especially in water-limited grassland ecosystems.
{"title":"Seasonal and interannual variations of ecosystem photosynthetic characteristics in a semi-arid grassland of Northern China","authors":"Cuihai You, Yanbing Wang, Xingru Tan, Bingwei Zhang, Tingting Ren, Boyu Chen, Mengzhen Xu, Shiping Chen","doi":"10.1093/jpe/rtac065","DOIUrl":"https://doi.org/10.1093/jpe/rtac065","url":null,"abstract":"\u0000 The ecosystem apparent quantum yield (α), maximum rate of gross CO2 assimilation (Pmax), and daytime ecosystem respiration rate (Rd) reflecting the physiological functioning of ecosystem, are vital photosynthetic parameters for the estimation of ecosystem carbon budget. Climatic drivers may affect photosynthetic parameters both directly and indirectly by altering the response of vegetation. However, the relative contribution and regulation pathway of environmental and physiological controls remain unclear, especially in semi-arid grasslands. We analyzed seasonal and interannual variations of photosynthetic parameters derived from eddy-covariance observation in a typical semi-arid grassland in Inner Mongolia, northern China, over 12 years from 2006 to 2017. Regression analyses and a structural equation model (SEM) were adopted to separate the contributions of environmental and physiological effects. The photosynthetic parameters showed unimodal seasonal patterns and significantly interannual variations. Variations of air temperature (Ta) and soil water content (SWC) drove the seasonal patterns of photosynthetic parameters, while SWC predominated their interannual variations. Moreover, contrasting with the predominant role of Ta on α and Rd, SWC explained more variances of Pmax than Ta. Results of SEM elucidated that environmental factors impacted photosynthetic parameters both directly and indirectly through regulating physiological responses reflected by stomatal conductance at the canopy level. Moreover, leaf area index (LAI) directly affected α, Pmax and Rd and dominated the variation of Pmax. On the other hand, SWC influenced photosynthetic parameters indirectly through LAI and canopy surface conductance (gc). Our finding highlights the importance of physiological regulation on the photosynthetic parameters and carbon assimilation capacity, especially in water-limited grassland ecosystems.","PeriodicalId":50085,"journal":{"name":"Journal of Plant Ecology","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2022-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41893675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The carbon and water cycle, an important biophysical process of terrestrial ecosystems, may be changed by anthropogenic revegetation in arid and semiarid areas. However, there is still a lack of understanding of the mechanism of carbon and water coupling in intrinsic ecosystems in the context of human activities. Based on the CO2 and H2O flux measurements of the desert steppe with the planted shrub Caragana liouana, this study explores the carbon and water flux coupling of the ecosystem by analyzing the variations in gross primary productivity (GPP), evapotranspiration (ET), and water use efficiency (WUE) and discussing the driving mechanism of biological factors. The seasonal variation in climate factors induced a periodic variation pattern of biophysical traits and carbon and water fluxes. The GPP and ET fluctuated in season, but the WUE was relatively stable in the growing season. The GPP, ET, and WUE were significantly driven by global radiation (Rg), temperature (Ta and Ts), water vapor pressure deficit (VPD), leaf area index (LAI), and plant water stress index (PWSI). However, Rg, temperature, and PWSI were the most important factors regulating WUE. Rg and temperature directly affected WUE with a positive effect but indirectly inhibited WUE by rising PWSI. Plant water stress inhibited photosynthesis and transpiration of the planted shrub community in desert steppe. When the plant water stress breaks a threshold (PWSI >0.54), the WUE will decrease since the GPP respond more quickly to the plant water stress than ET. Our findings suggest that policies related to large-scale carbon sequestration initiatives under afforestation must first fully consider the statuses of water consumption and WUE.
{"title":"Carbon-water coupling and its relationship with environmental and biological factors in a planted Caragana liouana shrub community in desert steppe, northwest China","authors":"Lingfeng Du, Longlong Ma, Hairong Pan, Chenglong Qiao, Chen Meng, Hongyue Wu, Jing Tian, Honggang Yuan","doi":"10.1093/jpe/rtac064","DOIUrl":"https://doi.org/10.1093/jpe/rtac064","url":null,"abstract":"\u0000 The carbon and water cycle, an important biophysical process of terrestrial ecosystems, may be changed by anthropogenic revegetation in arid and semiarid areas. However, there is still a lack of understanding of the mechanism of carbon and water coupling in intrinsic ecosystems in the context of human activities. Based on the CO2 and H2O flux measurements of the desert steppe with the planted shrub Caragana liouana, this study explores the carbon and water flux coupling of the ecosystem by analyzing the variations in gross primary productivity (GPP), evapotranspiration (ET), and water use efficiency (WUE) and discussing the driving mechanism of biological factors. The seasonal variation in climate factors induced a periodic variation pattern of biophysical traits and carbon and water fluxes. The GPP and ET fluctuated in season, but the WUE was relatively stable in the growing season. The GPP, ET, and WUE were significantly driven by global radiation (Rg), temperature (Ta and Ts), water vapor pressure deficit (VPD), leaf area index (LAI), and plant water stress index (PWSI). However, Rg, temperature, and PWSI were the most important factors regulating WUE. Rg and temperature directly affected WUE with a positive effect but indirectly inhibited WUE by rising PWSI. Plant water stress inhibited photosynthesis and transpiration of the planted shrub community in desert steppe. When the plant water stress breaks a threshold (PWSI >0.54), the WUE will decrease since the GPP respond more quickly to the plant water stress than ET. Our findings suggest that policies related to large-scale carbon sequestration initiatives under afforestation must first fully consider the statuses of water consumption and WUE.","PeriodicalId":50085,"journal":{"name":"Journal of Plant Ecology","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2022-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61597351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Michael J O’Brien,Elisa P Carbonnell,Christian Schöb
Abstract The Dehesa ecosystem provides important social and economic values across the Iberian Peninsula and assessing the temporal dynamics of this system under climate change is important for the maintenance and conservation of these highly valuable ecosystems. Here we present the baseline data of an observational plot network in the Dehesa that will form the foundation for monitoring long-term dynamics and for experimental manipulations testing the mechanisms driving resilience within the Dehesa. The initial surveys indicate that the forest structure is typical for the Dehesa, which suggests it is an exemplary site for examining temporal dynamics of this ecosystem. We present these initial data to encourage collaborations from international scientists via either direct experimental projects or meta-analyses.
{"title":"Aprisco Field Station: The spatial structure of a new experimental site focused on agroecology","authors":"Michael J O’Brien,Elisa P Carbonnell,Christian Schöb","doi":"10.1093/jpe/rtac061","DOIUrl":"https://doi.org/10.1093/jpe/rtac061","url":null,"abstract":"Abstract The Dehesa ecosystem provides important social and economic values across the Iberian Peninsula and assessing the temporal dynamics of this system under climate change is important for the maintenance and conservation of these highly valuable ecosystems. Here we present the baseline data of an observational plot network in the Dehesa that will form the foundation for monitoring long-term dynamics and for experimental manipulations testing the mechanisms driving resilience within the Dehesa. The initial surveys indicate that the forest structure is typical for the Dehesa, which suggests it is an exemplary site for examining temporal dynamics of this ecosystem. We present these initial data to encourage collaborations from international scientists via either direct experimental projects or meta-analyses.","PeriodicalId":50085,"journal":{"name":"Journal of Plant Ecology","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2022-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138516942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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