快速湿润过程中钾和钙离子浓度对土壤团聚体稳定性的影响

发布时间：2018-05-04 19:26

本文选题：土壤 + 团聚体　；参考：《农业工程学报》2017年22期

【摘要】：为探索土壤团聚体稳定性对电解质的响应情况,该文研究湖北省2种土地利用方式下(林地、耕地)的3种类型土壤(黄褐土、黄棕壤、棕红壤)团聚体,在不同浓度(0、0.005、0.01、0.02、0.05、0.08、0.10、0.20 mol/L)电解质(KNO_3、Ca(NO_3)_2)溶液中快速湿润时的稳定性和破碎过程。结果表明:1)浓度低于0.1 mol/L时,团聚体稳定性随电解质浓度增大而减小;2)团聚体稳定度AS随湿润时间呈双指数衰减,与纯水相比,棕红壤和林地黄褐土的破碎过程受电解质溶液影响尤为显著,黄褐土和耕地黄棕壤在电解质溶液中迅速全部破碎;3)初始阶段团聚体破碎能量与土壤粉粘比和有机质含量呈负相关,与铁铝氧化物含量呈正相关。总之,团聚体稳定性随电解质溶液浓度增大而减小,且相对于纯水,团聚体在电解质溶液中破碎更快。
[Abstract]:In order to explore the response of soil aggregate stability to electrolytes, three types of soil aggregates (yellow cinnamon soil, yellow brown soil, brown red soil) under two land use patterns (woodland, cultivated land) in Hubei Province were studied. The stability and breakage process of KNO3CaNo3 + KNO3 + KNO3 / L + 0.20 mol / L electrolyte at different concentrations of 0. 005 ~ 0. 01 ~ 0. 02 ~ 0. 05 ~ 0. 085 ~ 0. 010 ~ 0. 10 ~ 0. 20 mol / L) during rapid wetting. The results show that when the concentration of 1: 1) is below 0.1 mol/L, the stability of the aggregates decreases with the increase of electrolyte concentration. The stability of the aggregates decreases exponentially with the wetting time, compared with pure water. The breaking process of brown-red soil and woodland yellow cinnamon soil was especially affected by electrolyte solution. Yellow cinnamon soil and cultivated yellow brown soil were rapidly broken in electrolyte solution.) in the initial stage, the crushing energy of aggregates was negatively correlated with soil silt-viscosity ratio and organic matter content, and positively correlated with iron and aluminum oxide content. In a word, the stability of aggregates decreases with the increase of electrolyte concentration, and the aggregates break up faster than pure water.
【作者单位】：华中农业大学资源与坏境学院;农业部长江中下游耕地保育重点实验室;
【基金】：国家自然科学基金重点项目“花岗岩风化岩土体特性的地带性分异及崩岗形成机理研究”(No:41630858);国家自然科学基金“典型地带性土壤团聚体抗侵蚀稳定性及其与铁铝氧化物关系”(No:41471231)
【分类号】：S152.4

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