放牧率对土壤饱和导水率及其空间变异的影响

本文研究放牧对土壤饱和导水率及其对饱和导水率空间变异的影响。结果表明，在２ｍ及２ｍ以上相邻两点之间土壤饱和导水率相互独立，在各个方向均如此。虽自然对数正态分。放牧对饱和导水率和饱和导水率的标准差有极显著的作用，一元方差分析ｐ＝０．００３和０．００４。随着放牧率的增大，饱和导水率降低，与放牧率呈极显著的回归关系。

Effects of Stocking Rate on Soil Saturated Hydraulic Conductivity and Its Spatial Variation

The effects of grazing rate on the soil saturated hydraulic conductivity and its spatial variation were investigated in a grazing trial which began in 1990 at Baiyinxile Rancho,Inner Mongolia .China.The stocking rate were 0, 1. 33, 2. 67, 4. 0, 5. 33, 6. 67 sheep unit/ha and rotation grazing treatn1ent was conducted.The saturated hydraulic conductivity between two adjacent points,with separation distance of 2m or above in all directions are independent. The saturated hydraulic conductiviy was in-normally distributed and all data were natural logarithmically transformed be fore statistical analysis. Grazing had significant effects on soil saturaed hydraulic conductivity (p=0. 003 of one way analysis of variance ) and its standard deviation (p = 0. 004 of one way analysis of variance ). The soil saturated hydraulic conductivity decreased with the increasing of stocking rate,and the two demonstrated significant regression relation. The regression equation was Y = e, where Y was saturated hydraulic conductivity in mm/second and X was stocking rate in sheep unit/ha. The stocking rate and the spatial variation of saturated hydraulic conductivity did not lead a linear relation.