cated that Mo adsorption on calcium carbonate was low, reanalysis of their data indicated that adsorption on The constant capacitance model, a chemical surface complexation this CaCO3 at pH 7.1 was comparable in magnitude to model, was applied to Mo adsorption on 36 samples from 27 soil series selected for variation in soil properties. A general regression adsorption on illite at pH 7.0 and three times as great model was developed for predicting soil Mo surface complexation as adsorption on montmorillonite at pH 7.0 and wellconstants from four independently measured soil chemical characteriscrystallized kaolinite at pH 6.8. tics: cation exchange capacity, organic carbon content, inorganic carMolybdenum adsorption on soils and soil minerals bon content, and iron oxide content. The constant capacitance model has been described by various modeling approaches. was well able to predict Mo adsorption on all 36 soil samples. IncorpoSuch models include the empirical Freundlich, Langration of these regression prediction equations into chemical speciamuir, and Temkin adsorption isotherms (Reisenauer et tion–transport models will allow simulation of soil solution Mo conal., 1962; Theng, 1971; Karimian and Cox, 1978; Phelan centrations under diverse environmental and agricultural management and Mattigod, 1984; Xie and MacKenzie, 1991; Goldconditions without requiring soil specific adsorption data and subseberg and Forster, 1998) and surface complexation modquent parameter optimization. els: constant capacitance model (Motta and Miranda, 1989; Goldberg et al., 1996, 1998), triple layer model (Goldberg et al., 1998; Wu et al., 2001), Stern variable M is both a micronutrient essential for surface charge-variable surface potential model (Mcplant growth and a potentially toxic trace eleKenzie, 1983), and CD-MUSIC model (Bourikas et al., ment, especially for grazing animals. Molybdenum defi2001). Parameters from empirical models are only valid ciencies have been reported for many agronomic crops for the conditions under which the experiment was conthroughout the world (Murphy and Walsh, 1972). Moducted. Surface complexation models are chemical modlybdenum occurs in an anionic form that is readily taken els that utilize defined surface species, chemical reacup by forage plants and can accumulate to levels detritions, mass balances, and charge balances and contain mental to grazing ruminant animals (Reisenauer et al., molecular features that can be given thermodynamic 1973). Cattle grazing in some areas of the San Joaquin significance (Sposito, 1983). Valley of California, especially on legumes, were found Chemical modeling of Mo adsorption at the mineral– to be adversely affected by elevated soil Mo content solution interface has been successful using the constant mainly on alkaline soils (Barshad, 1948). On the other capacitance model (Motta and Miranda, 1989; Goldberg hand, soils in northwest Oregon producing pastures with et al., 1996, 1998) and the triple layer
注意到Mo在碳酸钙上的吸附较低，对他们的数据进行再分析表明，在恒定电容模型上的吸附是一种化学表面络合模型，该模型在pH值为7.1的CaCO3与模型的量级相当，适用于27个土壤系列中36个样品的Mo吸附。建立了pH 7.0时伊利石的一般回归吸附和pH 7.0时蒙脱土吸附的三倍大模型，并从pH 6.8时四个独立测量的土壤化学特征结晶高岭石的井常数中预测土壤Mo表面络合。tics:阳离子交换容量，有机碳含量，无机碳钼在土壤上的吸附，土壤矿物质碳含量，氧化铁含量。恒电容模型已被各种建模方法所描述。能够很好地预测钼在所有36个土壤样品上的吸附。这些模型包括经验Freundlich，将这些回归预测方程转化为化学模型，以及Temkin吸附等温线(Reisenauer et - transport模型将允许模拟土壤溶液Mo)。, 1962;按照推动,1971;Karimian and Cox, 1978;不同环境和农业管理下的Phelan集中度和Mattigod, 1984;Xie and MacKenzie, 1991;金条件下不需要土壤特定吸附数据和subseberg和Forster, 1998)和表面络合模态参数优化。els:恒电容模型(Motta and Miranda, 1989;Goldberg et al.， 1996,1998)，三层模型(Goldberg et al.， 1998;Wu et al.， 2001)， Stern变量M既是表面电荷-可变表面电位模型(Mcplant生长和潜在毒性痕量eleKenzie, 1983)和CD-MUSIC模型(Bourikas et al.， ment)所必需的微量营养素，特别是对于放牧动物。钼defi2001)。经验模型的参数只有在世界各地进行实验的条件下才有效(Murphy和Walsh, 1972)。Moducted。表面络合模型是以阴离子形式存在的化学钼，它很容易被吸收，利用确定的表面物质，被饲料植物的化学吸收，可以积累到一定程度的破坏，质量平衡和电荷平衡，并包含食草反刍动物(Reisenauer等人，可以给出热力学1973年的分子特征)。在圣华金河的一些重要地区放牧牛(possito, 1983)。在加州谷地，特别是豆科植物上，发现矿物上Mo吸附的化学模型-受到土壤Mo含量升高的不利影响，溶液界面已成功地使用常量主要在碱性土壤上(Barshad, 1948)。另一个电容模型(Motta and Miranda, 1989;Goldberg hand，俄勒冈州西北部生产牧场的土壤(等人，1996年，1998年)和三层模型(Goldberg高Mo含量是酸，pH值在4.4范围内等人，1998年)的氧化物，粘土矿物和土壤。在这些5.3(久保田等人，1967)。豆科植物是钼的有效研究对象，钼吸附被描述为形成单积累体，特别是在高土壤pH值时，而大多数齿状表面络合物。在三层模型中，禾草和粮食作物不积累Mo到毒性研究中，Mo在Fe和Al氧化物、高岭石上的吸附水平(O’connor等，2001)。钼发挥其伊利石作用，两种土壤通过诱导铜失球吸附机制对放牧牛产生内毒效应。钼在蒙脱土上的吸附效果尤其明显，脱硫效果最好。高钼的不良影响可以通过外球吸附机制来减轻(动物的Goldby铜补充)(O 'Connor et berg et al.， 1998)。钼在钛铝上的吸附，2001)。用CD-MUSIC模型对土壤溶液中氧化钼的浓度和吸附特性进行了详细的定量描述，需要在土壤矿物表面进行单齿状和双齿状的混合表面反应。(Bourikas et al.， 2001)。虽然从化学上讲，土壤溶液pH、土壤质地、土壤溶液种类等因素对交换水分、温度、氧化物含量、有机质复合物的主导作用是合理的，但含量与粘土矿物学之间并不一定存在1:1的对应关系(Reisenauer et al.， 1973)。溶液和表面物质(possito, 1983)。随着溶液中钼种类的增加，钼的主要吸附面在大部分溶液pH值上为moo24。在pH范围内，钼的主要吸附面为:pKa1 4.00, pKa2 4.24 (Lindsay, 1979)。 注意到Mo在碳酸钙上的吸附较低，对他们的数据进行再分析表明，在恒定电容模型上的吸附是一种化学表面络合模型，该模型在pH值为7.1的CaCO3与模型的量级相当，适用于27个土壤系列中36个样品的Mo吸附。建立了pH 7.0时伊利石的一般回归吸附和pH 7.0时蒙脱土吸附的三倍大模型，并从pH 6.8时四个独立测量的土壤化学特征结晶高岭石的井常数中预测土壤Mo表面络合。tics:阳离子交换容量，有机碳含量，无机碳钼在土壤上的吸附，土壤矿物质碳含量，氧化铁含量。恒电容模型已被各种建模方法所描述。能够很好地预测钼在所有36个土壤样品上的吸附。这些模型包括经验Freundlich，将这些回归预测方程转化为化学模型，以及Temkin吸附等温线(Reisenauer et - transport模型将允许模拟土壤溶液Mo)。, 1962;按照推动,1971;Karimian and Cox, 1978;不同环境和农业管理下的Phelan集中度和Mattigod, 1984;Xie and MacKenzie, 1991;金条件下不需要土壤特定吸附数据和subseberg和Forster, 1998)和表面络合模态参数优化。els:恒电容模型(Motta and Miranda, 1989;Goldberg et al.， 1996,1998)，三层模型(Goldberg et al.， 1998;Wu et al.， 2001)， Stern变量M既是表面电荷-可变表面电位模型(Mcplant生长和潜在毒性痕量eleKenzie, 1983)和CD-MUSIC模型(Bourikas et al.， ment)所必需的微量营养素，特别是对于放牧动物。钼defi2001)。经验模型的参数只有在世界各地进行实验的条件下才有效(Murphy和Walsh, 1972)。Moducted。表面络合模型是以阴离子形式存在的化学钼，它很容易被吸收，利用确定的表面物质，被饲料植物的化学吸收，可以积累到一定程度的破坏，质量平衡和电荷平衡，并包含食草反刍动物(Reisenauer等人，可以给出热力学1973年的分子特征)。在圣华金河的一些重要地区放牧牛(possito, 1983)。在加州谷地，特别是豆科植物上，发现矿物上Mo吸附的化学模型-受到土壤Mo含量升高的不利影响，溶液界面已成功地使用常量主要在碱性土壤上(Barshad, 1948)。另一个电容模型(Motta and Miranda, 1989;Goldberg hand，俄勒冈州西北部生产牧场的土壤(等人，1996年，1998年)和三层模型(Goldberg高Mo含量是酸，pH值在4.4范围内等人，1998年)的氧化物，粘土矿物和土壤。在这些5.3(久保田等人，1967)。豆科植物是钼的有效研究对象，钼吸附被描述为形成单积累体，特别是在高土壤pH值时，而大多数齿状表面络合物。在三层模型中，禾草和粮食作物不积累Mo到毒性研究中，Mo在Fe和Al氧化
{"title":"Predicting Molybdenum Adsorption by Soils Using Soil Chemical Parameters in the Constant Capacitance Model","authors":"S. Goldberg, S. Lesch, D. Suarez","doi":"10.2136/sssaj2003.0970","DOIUrl":"https://doi.org/10.2136/sssaj2003.0970","url":null,"abstract":"cated that Mo adsorption on calcium carbonate was low, reanalysis of their data indicated that adsorption on The constant capacitance model, a chemical surface complexation this CaCO3 at pH 7.1 was comparable in magnitude to model, was applied to Mo adsorption on 36 samples from 27 soil series selected for variation in soil properties. A general regression adsorption on illite at pH 7.0 and three times as great model was developed for predicting soil Mo surface complexation as adsorption on montmorillonite at pH 7.0 and wellconstants from four independently measured soil chemical characteriscrystallized kaolinite at pH 6.8. tics: cation exchange capacity, organic carbon content, inorganic carMolybdenum adsorption on soils and soil minerals bon content, and iron oxide content. The constant capacitance model has been described by various modeling approaches. was well able to predict Mo adsorption on all 36 soil samples. IncorpoSuch models include the empirical Freundlich, Langration of these regression prediction equations into chemical speciamuir, and Temkin adsorption isotherms (Reisenauer et tion–transport models will allow simulation of soil solution Mo conal., 1962; Theng, 1971; Karimian and Cox, 1978; Phelan centrations under diverse environmental and agricultural management and Mattigod, 1984; Xie and MacKenzie, 1991; Goldconditions without requiring soil specific adsorption data and subseberg and Forster, 1998) and surface complexation modquent parameter optimization. els: constant capacitance model (Motta and Miranda, 1989; Goldberg et al., 1996, 1998), triple layer model (Goldberg et al., 1998; Wu et al., 2001), Stern variable M is both a micronutrient essential for surface charge-variable surface potential model (Mcplant growth and a potentially toxic trace eleKenzie, 1983), and CD-MUSIC model (Bourikas et al., ment, especially for grazing animals. Molybdenum defi2001). Parameters from empirical models are only valid ciencies have been reported for many agronomic crops for the conditions under which the experiment was conthroughout the world (Murphy and Walsh, 1972). Moducted. Surface complexation models are chemical modlybdenum occurs in an anionic form that is readily taken els that utilize defined surface species, chemical reacup by forage plants and can accumulate to levels detritions, mass balances, and charge balances and contain mental to grazing ruminant animals (Reisenauer et al., molecular features that can be given thermodynamic 1973). Cattle grazing in some areas of the San Joaquin significance (Sposito, 1983). Valley of California, especially on legumes, were found Chemical modeling of Mo adsorption at the mineral– to be adversely affected by elevated soil Mo content solution interface has been successful using the constant mainly on alkaline soils (Barshad, 1948). On the other capacitance model (Motta and Miranda, 1989; Goldberg hand, soils in northwest Oregon producing pastures with et al., 1996, 1998) and the triple layer","PeriodicalId":22142,"journal":{"name":"Soil Science Society of America Journal","volume":"1 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2003-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67757900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fluometuron [N,N-dimethyl- N'-[3-(trifluoromethyl)phenyl] urea], a herbicide used on cotton (Gossypium hirsutum), is fairly mobile in soil. This study quantified effects of tillage (conventional-till [CT] and no-till [NT]) and cover crop (native vegetation, hairy vetch [ Vicia villosa] and wheat [Triticum aestivum]) on fluometuron sorption and degradation in intact cores (10-cm diam. by approximately 7.5 cm long) of Gigger (fine-silty, mixed, thermic Typic Fragiudalfs) soil. Batch sorption was well described by Freundlich isotherms. Sorption generally increased with soil organic C and was greater in NT, than in CT, 0- to 3-cm soil. No-till soil had more earthworms and arthropods. suggesting greater physical heterogeneity and potential physical nonequilibrium during transport. Tracer elution from slightly unsaturated (-0.1 bar) cores did not show preferential flow. First-order degradation rate constants were obtained by fitting a convective-dispersive/ diffusive transport model to effluent fluometuron concentrations from seven simulated rains. Degradation was faster in NT, than in CT, native soil (k d s = 0.09 and 0.04 d -1 ). Tillage did not affect degradation in the vetch (k d s = 0.07 d -1 ) or wheat (k d s = 0.8 d -1 ) soils. Degradation in CT and NT vetch cores was faster than in an earlier batch study. To the extent intact cores better represent field conditions than homogeneous soil, degradation in cores may more accurately reflect degradation in the field.
氟脱脲[N,N-二甲基- N'-[3-(三氟甲基)苯基]尿素]是一种用于棉花(棉)的除草剂，在土壤中具有相当的流动性。本研究量化了耕作(常规耕作[CT]和免耕作[NT])和覆盖作物(原生植被、毛叶野豌豆[Vicia villosa]和小麦[Triticum aestivum])对Gigger(细粉质、混合、热典型Fragiudalfs)土壤完整岩心(直径10厘米，长约7.5厘米)中荧光素吸收和降解的影响。Freundlich等温线很好地描述了批吸附。土壤有机碳的吸收量一般随土壤有机碳的增加而增加，在0 ~ 3 cm土壤中，NT的吸收量大于CT。免耕土壤中蚯蚓和节肢动物较多。表明在运输过程中更大的物理异质性和潜在的物理不平衡。轻微不饱和(-0.1 bar)岩心的示踪剂洗脱没有表现出优先流动。通过将对流-色散/扩散输运模型拟合到7次模拟降雨的流出物荧光素浓度，获得了一级降解速率常数。土壤的降解速度比土壤快(k d s分别为0.09和0.04 d -1)。耕作对紫薇(k d s = 0.07 d -1)和小麦(k d s = 0.8 d -1)土壤的退化没有影响。CT和NT紫杉岩心的降解速度比早期的批量研究要快。在某种程度上，完整的岩心比均匀的土壤更能代表野外条件，岩心的退化可能更准确地反映野外的退化。
{"title":"Fluometuron Sorption and Degradation in Cores of Silt Loam Soil from Different Tillage and Cover Crop Systems","authors":"L. Gaston, D. Boquet, M. Bosch","doi":"10.2136/SSSAJ2003.0747","DOIUrl":"https://doi.org/10.2136/SSSAJ2003.0747","url":null,"abstract":"Fluometuron [N,N-dimethyl- N'-[3-(trifluoromethyl)phenyl] urea], a herbicide used on cotton (Gossypium hirsutum), is fairly mobile in soil. This study quantified effects of tillage (conventional-till [CT] and no-till [NT]) and cover crop (native vegetation, hairy vetch [ Vicia villosa] and wheat [Triticum aestivum]) on fluometuron sorption and degradation in intact cores (10-cm diam. by approximately 7.5 cm long) of Gigger (fine-silty, mixed, thermic Typic Fragiudalfs) soil. Batch sorption was well described by Freundlich isotherms. Sorption generally increased with soil organic C and was greater in NT, than in CT, 0- to 3-cm soil. No-till soil had more earthworms and arthropods. suggesting greater physical heterogeneity and potential physical nonequilibrium during transport. Tracer elution from slightly unsaturated (-0.1 bar) cores did not show preferential flow. First-order degradation rate constants were obtained by fitting a convective-dispersive/ diffusive transport model to effluent fluometuron concentrations from seven simulated rains. Degradation was faster in NT, than in CT, native soil (k d s = 0.09 and 0.04 d -1 ). Tillage did not affect degradation in the vetch (k d s = 0.07 d -1 ) or wheat (k d s = 0.8 d -1 ) soils. Degradation in CT and NT vetch cores was faster than in an earlier batch study. To the extent intact cores better represent field conditions than homogeneous soil, degradation in cores may more accurately reflect degradation in the field.","PeriodicalId":22142,"journal":{"name":"Soil Science Society of America Journal","volume":"67 1","pages":"747-755"},"PeriodicalIF":2.9,"publicationDate":"2003-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67757719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Low Frequency Impedance Behavior of Montmorillonite Suspensions","authors":"L. Dudley, S. Bialkowski, D. Or, C. Junkermeier","doi":"10.2136/SSSAJ2003.0518","DOIUrl":"https://doi.org/10.2136/SSSAJ2003.0518","url":null,"abstract":"","PeriodicalId":22142,"journal":{"name":"Soil Science Society of America Journal","volume":"67 1","pages":"518-526"},"PeriodicalIF":2.9,"publicationDate":"2003-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67757711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Aluminum Effects on at Low Solution Concentrations","authors":"A. Heim, I. Brunner, E. Frossard, J. Luster","doi":"10.2136/SSSAJ2003.0895","DOIUrl":"https://doi.org/10.2136/SSSAJ2003.0895","url":null,"abstract":"","PeriodicalId":22142,"journal":{"name":"Soil Science Society of America Journal","volume":"67 1","pages":"895"},"PeriodicalIF":2.9,"publicationDate":"2003-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67757819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ammonia volatilization is an important issue in agricultural production and environmental protection. Experimental methods and numerical models exist to estimate the rate and amount of ammonia volatilization from commercial fertilizers and animal manures applied to a field. The existing models imposed assumptions on water movement in a soil profile that were judged to be inadequate for surface-applied swine (Sus Domesticus) effluent. In this research, a computer model was developed to estimate short-term ammonia volatilization from swine effluent applied to a field by flood or sprinkler irrigation. The model simulates simultaneous water flow, heat flow, and the transport and transformation of ammoniacal N in a soil profile using the finite difference method. Submodels were developed to evaluate concentrations of ammoniacal N in the infiltration pond of a flood irrigation event and in the droplets of sprinkler irrigation. The governing equations for the water flow, heat flow, and chemical transport modules and the irrigation submodules were derived from mass balance and energy balance employing constitutive laws established empirically. The model was tested against data from field experiments using parameters obtained from independent sources. The simulation results were in excellent agreement with experimental data in three out of six experiments. In the other three experiments, the predicted cumulative volatilization exceeded the measured amount by 5 to 30 kg ha -1 at the end of 1 wk. The differences were primarily in the first sampling period after the application. The simulated cumulative volatilization was most sensitive to temperature, pH of the soil system, and pH of the effluent applied.
氨挥发是农业生产和环境保护中的一个重要问题。已有实验方法和数值模型来估计施用于农田的商品肥料和动物粪便的氨挥发速率和量。现有的模型对土壤剖面中的水运动进行了假设，这些假设被认为不适用于表面施用的猪(Sus Domesticus)废水。在这项研究中，开发了一个计算机模型来估计通过洪水或喷灌将猪废水用于农田的短期氨挥发。该模型采用有限差分法模拟了土壤剖面中水流、热流以及氨态氮的运移和转化过程。建立了洪水灌溉入渗池中氨态氮浓度和喷灌水滴中氨态氮浓度的子模型。水流、热流、化学输运模块和灌溉子模块的控制方程由质量平衡和能量平衡推导，采用经验建立的本构律。利用独立来源的参数对该模型进行了现场试验数据的检验。在6次实验中，有3次模拟结果与实验数据吻合良好。在其他三个实验中，在1周结束时，预测的累积挥发量超过实测值5至30 kg ha -1。差异主要出现在施用后的第一个采样周期。模拟的累积挥发量对温度、土壤系统pH值和出水pH值最为敏感。
{"title":"Modeling Ammonia Volatilization from Surface‐Applied Swine Effluent","authors":"J. Wu, D. L. Nofziger, J. Warren, J. Hattey","doi":"10.2136/SSSAJ2003.0001","DOIUrl":"https://doi.org/10.2136/SSSAJ2003.0001","url":null,"abstract":"Ammonia volatilization is an important issue in agricultural production and environmental protection. Experimental methods and numerical models exist to estimate the rate and amount of ammonia volatilization from commercial fertilizers and animal manures applied to a field. The existing models imposed assumptions on water movement in a soil profile that were judged to be inadequate for surface-applied swine (Sus Domesticus) effluent. In this research, a computer model was developed to estimate short-term ammonia volatilization from swine effluent applied to a field by flood or sprinkler irrigation. The model simulates simultaneous water flow, heat flow, and the transport and transformation of ammoniacal N in a soil profile using the finite difference method. Submodels were developed to evaluate concentrations of ammoniacal N in the infiltration pond of a flood irrigation event and in the droplets of sprinkler irrigation. The governing equations for the water flow, heat flow, and chemical transport modules and the irrigation submodules were derived from mass balance and energy balance employing constitutive laws established empirically. The model was tested against data from field experiments using parameters obtained from independent sources. The simulation results were in excellent agreement with experimental data in three out of six experiments. In the other three experiments, the predicted cumulative volatilization exceeded the measured amount by 5 to 30 kg ha -1 at the end of 1 wk. The differences were primarily in the first sampling period after the application. The simulated cumulative volatilization was most sensitive to temperature, pH of the soil system, and pH of the effluent applied.","PeriodicalId":22142,"journal":{"name":"Soil Science Society of America Journal","volume":"41 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2003-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67757251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Nitrogen Retranslocation Response of Young to Nitrogen-15 Supply","authors":"K. Salifu, V. Timmer","doi":"10.2136/SSSAJ2003.0309","DOIUrl":"https://doi.org/10.2136/SSSAJ2003.0309","url":null,"abstract":"","PeriodicalId":22142,"journal":{"name":"Soil Science Society of America Journal","volume":"67 1","pages":"309"},"PeriodicalIF":2.9,"publicationDate":"2003-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67757401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The Method for Fitting Neural Network Parametric Pedotransfer Functions","authors":"B. Minasny, A. McBratney","doi":"10.2136/SSSAJ2002.0352","DOIUrl":"https://doi.org/10.2136/SSSAJ2002.0352","url":null,"abstract":"","PeriodicalId":22142,"journal":{"name":"Soil Science Society of America Journal","volume":"66 1","pages":"352-361"},"PeriodicalIF":2.9,"publicationDate":"2002-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2136/SSSAJ2002.0352","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67751429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Doerr, L. Dekker, C. Ritsema, R. Shakesby, R. Bryant
{"title":"Water repellency of soils","authors":"S. Doerr, L. Dekker, C. Ritsema, R. Shakesby, R. Bryant","doi":"10.2136/sssaj2002.0401","DOIUrl":"https://doi.org/10.2136/sssaj2002.0401","url":null,"abstract":"","PeriodicalId":22142,"journal":{"name":"Soil Science Society of America Journal","volume":"66 1","pages":"401-405"},"PeriodicalIF":2.9,"publicationDate":"2002-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67751444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Desorption Kinetics of Cadmium and Lead from Goethite","authors":"L. Glover, M. Eick, P. Brady","doi":"10.2136/SSSAJ2002.0797","DOIUrl":"https://doi.org/10.2136/SSSAJ2002.0797","url":null,"abstract":"","PeriodicalId":22142,"journal":{"name":"Soil Science Society of America Journal","volume":"66 1","pages":"797"},"PeriodicalIF":2.9,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67752135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
B. Bostick, S. Fendorf, M. Barnett, P. Jardine, S. Brooks
A mechanistic understanding of U sorption in natural soils and sediments is useful for determining its transport and bioavailability in the environment. X-ray absorption spectroscopy (XAS) was used to determine the mechanisms by which U(VI) sorbs to three heterogeneous subsurface media reacted under static and dynamic flow conditions. Regardless of the media chosen, ternary surface complexes were the dominant type of sorption complex. Uranyl phosphate complexes were formed in subsurface media from more acidic environments. In contrast, uranyl carbonate ternary surface complexes formed in media from more neutral conditions. The complexes are predominantly inner-sphere, although some outer-sphere complexes may also be present, and appear to be on iron (hydr)oxides and possibly aluminosilicates. Additionally, the uranyl phosphate and carbonate complexes are highly disordered, which contributes to their reversible sorption properties.
{"title":"Uranyl Surface Complexes Formed on Subsurface Media from DOE Facilities","authors":"B. Bostick, S. Fendorf, M. Barnett, P. Jardine, S. Brooks","doi":"10.2136/SSSAJ2002.0099","DOIUrl":"https://doi.org/10.2136/SSSAJ2002.0099","url":null,"abstract":"A mechanistic understanding of U sorption in natural soils and sediments is useful for determining its transport and bioavailability in the environment. X-ray absorption spectroscopy (XAS) was used to determine the mechanisms by which U(VI) sorbs to three heterogeneous subsurface media reacted under static and dynamic flow conditions. Regardless of the media chosen, ternary surface complexes were the dominant type of sorption complex. Uranyl phosphate complexes were formed in subsurface media from more acidic environments. In contrast, uranyl carbonate ternary surface complexes formed in media from more neutral conditions. The complexes are predominantly inner-sphere, although some outer-sphere complexes may also be present, and appear to be on iron (hydr)oxides and possibly aluminosilicates. Additionally, the uranyl phosphate and carbonate complexes are highly disordered, which contributes to their reversible sorption properties.","PeriodicalId":22142,"journal":{"name":"Soil Science Society of America Journal","volume":"66 1","pages":"99-108"},"PeriodicalIF":2.9,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67751339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：