放牧条件下草地土壤圆锥指数变异及其对牧草生长的影响

为研究放牧条件下草地土壤圆锥指数性质及其对草地牧草产量的影响,在内蒙古正常放牧的4块各100 hm2草地上测定产草量和用装载DGPS的电动圆锥仪测试土壤圆锥指数,采用Kriging插值法分析采样数据,绘制草地产草量和土壤圆锥指数分布图,分析圆锥指数变异对产草量的影响.试验表明,在放牧条件下,草地土壤圆锥指数变异强度中等,圆锥指数太大和太小都会降低草地牧草产量,当草地土壤圆锥指数在0.8～1.6 MPa时,草地牧草产量较高.

The variance of grazing grassland soil cone index and its relationship with grass yield

In this study the soil cone index(CI) was measured by using an auto penetrometer which was mounted on the tractor with a DGPS system.Soil cores were taken in four grazing grasslands in Inner Mongolia.The data which was collected was analyzed using a kriging method which was used to determine contour maps of CI at different layers and grass yields.The effect of the soil cone index on grass yield in the test areas was analyzed.The results showed that the soil CI variance intensity was at a middle level in the grasslands studied,and that grass yields will tend to decrease when CI values are either too high or too low.The grass growth was shown to be better and grass yield higher when soil CI ranged from 0.8 MPa to 1.6 MPa in the grazing grassland.