不同磷水平塿土的表面性质及其对磷素流失特征的影响
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1.西北农林科技大学资源环境学院;2.西北农林科技大学资源环境学院,农业部西北地区植物营养与农业环境重点实验室

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陕西省耕地土壤环境质量类别划分及受污染耕地修复示范项目(NYKJ-2021-YL(XN)19),陕西省自然科学基础研究计划项目(2021JQ-170),国家重点研发专项项目(2017YFD0200205)


The surface properties of Loessial soil with different phosphorus levels and its effect on the loss of phosphorus
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1.College of Natural Resources and Environment of Northwest A&2.F University;3.amp;4.F University, Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, China.

Fund Project:

Classification of Cultivated Soil Environmental Quality and Demonstration of Restoration of Polluted Cultivated Land in Shaanxi Province of China (No. NYKJ-2021-YL(XN)19), the Natural Science Foundation of Shaanxi Province, China (No. 2021 JQ-170), the National Key R&D Program of China (No. 2017YFD0200205)

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    摘要:

    为明确不同磷水平塿土的表面电化学性质特征,阐明电解质浓度调控下塿土表面性质的变化及其与土壤磷素流失特征的内在关联,利用物质表面性质联合测定分析技术,结合降雨模拟试验,研究了长期定位配施磷肥条件下不同磷水平塿土的表面电化学性质及其对土壤磷素流失特征的影响。结果表明:(1)长期施磷处理下的塿土全磷含量为不施磷处理的2.46倍,但其表面电位、表面电荷密度、表面电场强度、比表面积以及表面电荷数量均低于不施磷处理塿土;(2)不同磷水平塿土均表现出土壤颗粒及磷素流失量随着土粒表面电位(绝对值)升高而加剧的趋势,颗粒态磷的累积流失量与土壤颗粒累积流失量间呈线性正相关;(3)由于低磷水平塿土表面电位(绝对值)相对较高,所受土壤颗粒间静电排斥力更大,导致土壤团聚体稳定性较差,土壤颗粒及其附着磷素累积流失量更多;(4)本实验条件下土壤中磷素流失以颗粒态磷为主,占流失总量的81%~99%,溶解态磷占比十分有限。本研究阐明了长期定位施磷处理对土壤表面电化学性质的影响,明确了表面性质变化与土壤颗粒及磷素流失特征的关系,为长期施磷土壤的环境风险防控提供了新思路。

    Abstract:

    【Objective】This study was designed to identify the surface electrochemical characteristics of Loessial soil with different phosphorus levels and to study the transportation processes of phosphorus in the soil solid-liquid phase. Also, the relationship with soil surface properties was investigated and the change of surface properties of Loessial soil under controlled electrolyte concentration and its internal relevance with phosphorus loss were clarified. 【Method】The number of soil particles and phosphorus loss of Loessial soil under different electrolyte concentrations was obtained by rainfall simulation test. The surface chemical properties of the soil were determined by combined measurement and analysis of surface properties. Also, the surface electrochemical properties of Loessial soil with different phosphorus levels and their effects on soil phosphorus loss under the condition of long-term localized application of phosphate fertilizer were studied. 【Result】The results show that: (1) The total phosphorus content of Loessial soil treated with long-term application of phosphate fertilizer is 2.46 times larger than that of Loessial soil treated without phosphate fertilizer. However, the former’s surface potential, surface charge density, surface electric field strength, specific surface area, and surface charge number were lower than those of Loessial soil without the application of phosphorus; (2) For Loessial soils with different phosphorus levels, the cumulative loss of soil particles and phosphorus tended to intensify with an increase in the surface potential (absolute value) of soil particles. There was a linear positive correlation between the cumulative loss of particulate phosphorus (PP) and the cumulative loss of soil particles; (3) The surface potential (absolute value) of Loessial soil with lower phosphorus content was larger than that of Loessial soil with higher phosphorus content, and the electrostatic repulsion between soil particles was larger, resulting in poor stability of soil aggregates and more cumulative loss of soil particles and their attached phosphorus; (4) Under the experimental conditions, the phosphorus loss in Loessial soil was dominated by PP, accounting for 81%-99% of total phosphorus loss, and the proportion of dissolved phosphorus (DP) was extremely low. 【Conclusion】Long-term application of phosphate fertilizer can change the Loessial soil surface properties, and effectively maintain the stability of soil aggregates and attached phosphorus during rainfall. This study provides a new idea for environmental risk prevention and control of the long-term phosphorus application soil.

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胡良,杜伟,常博焜,曹钢,杨学云,吕家珑.不同磷水平塿土的表面性质及其对磷素流失特征的影响[J].土壤学报,,[待发表]
huliang, duwei, changbokun, caogang, yangxueyun, lvjialong. The surface properties of Loessial soil with different phosphorus levels and its effect on the loss of phosphorus[J]. Acta Pedologica Sinica,,[In Press]

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