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

Niu Haishan; Li Xiangzhen; Chen Zuozhong(Ecological Research Centre, Institute of Botany,Chinese Acadmy of Sciences, Beijing 100093)  
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.
【Fund】: 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
【CateGory Index】: S812
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