摘要
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。呈自然对数正态分布。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。回归方程为Y=e-2.72-0.0822x，其中Y为饱和导水率（mm／s）．x为放牧率（羊／hm2）。随着放牧率的增大，土壤饱和导水率的变异程度并未出现趋势性的变化。
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.
出处
《草地学报》
CAS
CSCD
1999年第3期211-216,共6页
Acta Agrestia Sinica
基金
中国科学院"九五"特别支持项目!KZ95T-04-03
重大项目!KZ951-A1-301
国家自然科学基金重大基金!49790020
关键词
草地
放牧率
土壤饱和导水率
Grazing
Stocking rate
Soil saturated conductivity
