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盐化和有机质对土壤结构稳定性及阿特伯格极限的影响
引用本文:李小刚,崔志军,王玲英,胡恒觉.盐化和有机质对土壤结构稳定性及阿特伯格极限的影响[J].土壤学报,2002,39(4):550-559.
作者姓名:李小刚  崔志军  王玲英  胡恒觉
作者单位:甘肃农业大学资源环境系,兰州,730070,甘肃农业大学农学系,兰州,730070
基金项目:甘肃省科委科技攻关项目(批准号:GK971-2-28A)的部分内容
摘    要:对甘肃景电灌区盐化和有机质对土壤团聚体的稳定性、黏粒的分散性及阿特伯格极限进行了调查研究。研究结果表明该灌区盐化土壤中水溶性盐以钠盐为主,土壤具有钠质现象。随含盐量和交换性钠离子百分率(ESP)的增加土壤团聚体的稳定性显著降低,黏粒的分散性显著增加,阿特伯格极限具有降低的趋势,明确地说明盐化和伴随着的钠质化是土壤结构性能退化的主要原因。随有机质含量的增加,土壤团聚体的稳定性显著增加,黏粒的分散性显著降低,阿特伯格极限显著增加,说明增加有机质含量可以显著改善盐化土壤的结构性能。可以根据如下公式利用有机质含量(OM)和ESP预测团聚体的稳定性:WSAR=19.4 0.98OM-1.43 ESP(R2=0.5741,n=67)。团聚体稳定性、黏粒分散性、流限和塑限互相之间显著相关,说明流限和塑限可以作为反映盐化土壤结构状况的指标。

关 键 词:团聚体稳定性  黏粒分散性  阿特伯格极限  盐度和钠质度  有机质含量
收稿时间:2000/10/10 0:00:00
修稿时间:2000年10月10

EFFECTS OF SALINIZATION AND ORGANIC MATTER ON SOIL STRUCTURAL STABILITY AND ATTERBERG LIMITS
Li Xiao-gang,Cui Zhi-jun,Wang Ling-ying and Hu Heng-jue.EFFECTS OF SALINIZATION AND ORGANIC MATTER ON SOIL STRUCTURAL STABILITY AND ATTERBERG LIMITS[J].Acta Pedologica Sinica,2002,39(4):550-559.
Authors:Li Xiao-gang  Cui Zhi-jun  Wang Ling-ying and Hu Heng-jue
Affiliation:Department of Environment and Resources, Gansu Agricultural University, Lanzhou 730070;Department of Environment and Resources, Gansu Agricultural University, Lanzhou 730070;Department of Environment and Resources, Gansu Agricultural University, Lanzhou 730070;Department of Agronomy, Gansu Agricultural University, Lanzhou 730070
Abstract:Soil structural stability, as measured by water-stable aggregate rate ( WSAR, the rate of > 0.25 mm water-stable aggregate's weight in 1- 5 mm dry aggregate's weight) and clay dispersion rate, and Atter-berg limits (ALS) were assessed with relation to salinity, sodicity and organic matter on salt-affected soil samples taken from Jingdian Irrigation Area, Gansu. The obtained results showed that soluble salts were dominated by sodium ion. As a result, soils were sodic. With increase in salinity and sodicity, aggregate stability decreased and clay dispersion increased significantly, meanwhile, there was a declining trend in ALS. This clearly implied that salinization as well as increase in sodicity was one of the factors which are responsible for soil structural degradation. With increase in organic matter ( OM) , aggregate stability and ALS increased and clay dispersion decreased markedly, which showed that addition in organic matter to salt-affected soils can improve structural characteristics. On the effects of OM and ESP on aggregate stability, WSAR could be predicted according to the following equation:WASR= 19.4 0.98OM-1.43ESP (R2 = 0.574 1, n = 67)Aggregate stability, clay dispersion, liquid limit and plastic limit significantly correlated. This illustrated that liquid limit and plastic limit could be used to characterize the structure of salt-affected soils.
Keywords:Aggregate stability  Clay dispersion  Atterberg limits  Organic matter  Salinity and sodicity
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