疏勒河灌区土壤剖面盐分分布及组成特征分析

在甘肃省疏勒河灌区黄花一号点上利用"S"型布点法分3 层采集土壤样品,对不同层次土壤总盐、pH 及EC的空间变异性进行研究.通过土壤盐渍剖面的聚类分析,研究并探讨该地区不同盐分剖面类型土壤含盐量在垂直方向的分布特征.结果表明:研究区土壤剖面点盐分除个别点外,大多数剖面盐分分布具有表聚性,土壤含盐量在垂直方向上变异较强,剖面的平均盐分,表层比中间层高56.44%,比底层高93.86%;土壤盐分离子组成中,阳离子含量Na+>Mg2+>Ca2+>K+,阴离子含量SO42->Cl->HCO->CO32-;就各离子与CE的相关性而言,阴阳离子均与EC成显著正相关,其中阳离子以Na+相关性最好,阴离子SO42-相关性最好.

Characteristics and Distribution of Soil Salinity in Soil Profile in Shule Irrigated Areas of Gansu

Soil samples were taken from 3 layers of each of the profiles distributed in a pattern of "S" in Shule irrigated areas of Gansu and used to determine space variability of total salt, pH and EC from layer to layer. through cluster analysis soil salinity profiles. Through hierarchical cluster analysis soil salinity profiles. And discussion profiles of the different types of salt in soil salinity vertical distribution. results showed that: salt accumulation at the surface soil layer was generally significant except individual, soil salinity exhibited strong variation in verticall spatial distribution, On in terms of profile salinity mean, surface higher than the middle layer for 36. 08% ,and than the bottom for 52. 98%. The composition of soil salinity, cation content of Na~+> Mg~(2+)>Ca~(2+)>K~+ , anion content of SO_4~(2-) >Cl~->HCO~->CO_3~(2-) ; On the ions and the relevance of CE, the cation-anion with the EC as a significant positive correlation, in which Na~+ cations and SO_4~(2-) anion in the main