内蒙古大青沟自然保护区土壤水分时空梯度分析

该文采用TDR分层对大青沟自然保护区土壤水分进行定位观测，利用DCCA排序定量分析土壤水分时空梯度与环境因子关系，通过Surfer软件的Kriging插值法绘制土壤水分等值线排序图。结果表明:该地区影响土壤水分生长季节变化的主要环境因子为植被、坡位和坡向。0～60 cm土层平均体积含水率在5～9月沟底阔叶林为29.33%～37.86%；下坡位蒙古栎矮林为6.29%～17.24%；中上坡灌丛为5.45%～12.20%；沙地樟子松林为5.04%～11.20%；沙地疏林草原为4.16%～5.43%。0～15 cm与16～30 cm表层土壤水分排序第1轴与海拔、坡向、坡位、植被有极显著的负相关系；31～45 cm与46～60 cm第1轴与坡向和坡度呈显著正相关；0～15 cm表层土壤水分波动较大，16～30 cm次之，31～45 cm和46～60 cm相对稳定。 

Spatio-temporal gradients of soil moisture in Daqinggou Nature Reserve,Inner Mongolia

By means of time domain reflectometry,the soil moisture contents in different soil layers of Daqinggou Nature Reserve were studied by site-fixed observation. By detrended canonial correspond analysis,the spatio-temporal gradients of soil moisture and the relationship with environmental factors were analyzed quantitatively.Ordination diagram of soil moisture contours was drawn by Kriging interpolation of Surfer software.Results show that slope position,vegetation,slope aspect were the main factors affecting ...