塔里木河中下游地区不同植被群系土壤盐基离子特征研究

为了寻求抑制植被生长的盐基离子的种类和含量范围,为塔里木河中下游地区天然植被的恢复和人工植被的重建提供依据。通过调查研究,确定了塔里木河中下游地区有10个植被群系,利用数理统计方法对CO32-、HCO3-、Cl-、SO42-、Ca2+、Mg2+、K+、Na+等土壤盐基离子进行了相关性分析,并采用多元统计法对植被群系盖度与土壤盐基离子进行相关性分析。NaCl、Na2SO4、NaHCO3是限制10个植被群系的主要盐分因素。HCO3-和Cl-、Mg2+和SO42-、Ca2+和K++Na+呈显著正相关;K++Na+和SO42-、K++Na+和Mg2+呈极显著正相关。植被群系盖度与各盐基离子之间没有显著相关性。不同植被群系下的土壤盐渍化类型主要有MgSO4和Na2SO4盐土,土壤各盐基离子对植被群系盖度均无显著的抑制作用。

Study on the Characteristics of Saline Base Ion in Soil in Different Vegetation Formation in the Middle and Lower Reach of Tarim River

The research was constructed to look for kind and content range of saline base ion to restrain the vegetation growth and provide the basis for resuming the natural vegetation and reestablishing the artificial vegetation in the middle and lower reach of Tarim Lake.On basis of investigation,10 vegetation formations were confirmed in the middle and lower reach of Tarim Lake.The mathematical statistical method was used to analyze the correlation among some soil saline base ion of CO32-,HCO3-,Cl-,SO42-,Ca2 ,Mg2 and K Na .The multivariate statistical method was used to analyze the correlation of coverage of vegetation formation and the saline base ion in soils.NaCl,Na2SO4 and NaHCO3 were the main salt factors restraining 10 vegetation formations.Significant positive correlations existed between HCO3-and Cl-, Mg2 and SO42-,Ca2 and K Na .And extremely significant positive correlations existed between K Na and SO42-,K Na and Mg2 .The coverage of vegetation formation had no significant correlation to each saline base ion in soil.The main salinization type of soil in different vegetation formations was MgSO4 and Na2SO4 saline soil.And various saline base ions all had no significant inhibition effect on the coverage of vegetation formations.