Spatial Variability of Soil Erodibility K Value and Influence of Sampling Densities on K Value Accuracy at a Scale of Small Watershed

YANG Ping; HU Xuli; JIANG Xiaosan; HE Xudong; PAN Jianjun

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Spatial Variability of Soil Erodibility K Value and Influence of Sampling Densities on K Value Accuracy at a Scale of Small Watershed

- Spatial Variability of Soil Erodibility K Value and Influence of Sampling Densities on K Value Accuracy at a Scale of Small Watershed
- Bulletin of Soiland Water Conservation Vol. 25, Issue 6, Pages: 35-39(2006)
- 作者机构：
  
  1. 南京农业大学资源与环境科学学院,江苏,南京,210095
  2. 淮河流域水土保持监测中心站,安徽,蚌埠,233001
  3. 河南省鲁山县水土保持科学试验站, 河南鲁山,467300
- 作者简介：
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- Published：2006
- 稿件说明：
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YANG Ping, HU Xuli, JIANG Xiaosan, et al. Spatial Variability of Soil Erodibility K Value and Influence of Sampling Densities on K Value Accuracy at a Scale of Small Watershed[J]. Bulletin of Soiland Water Conservation, 2006, 25(6): 35-39.
DOI：

YANG Ping, HU Xuli, JIANG Xiaosan, et al. Spatial Variability of Soil Erodibility K Value and Influence of Sampling Densities on K Value Accuracy at a Scale of Small Watershed[J]. Bulletin of Soiland Water Conservation, 2006, 25(6): 35-39. DOI：

摘要

以观音寺小流域为例

通过高密度采样

利用EPIC模型中土壤可蚀性K值计算公式计算了可蚀性K值

并运用逆距离加权插值方法生成了研究区的K值分布图。经典统计学方法分析表明

在小流域尺度下土壤可蚀性K值存在很强的空间变异性

其变异系数达39.94%。因此

定量监测、评价流域水土流失时

K值的这种空间变异性不能忽略。对不同采样密度下K值空间估值精度的评价表明

当采样点数目均匀地减少一半时

即4个/km

的样点密度下

K值估计误差仍然可以控制在25%以内。

Abstract

Taking the Guangyinsi watershed as an example

soil erodibility K values were calculated using EPIC model at large sampling densities

and the dist ribution map of K values was made using inverse distance weighting spatial interpolation. Classical statistical analyses show significant spatial variability of soil erodibility K values at a scale of small watershed

the variance coefficient of which is 39.94%. Therefore

the spatial variability should be taken into account in soil erosion monitoring at a scale of small watershed. The relative error of K values is less than 25% when half of the total samples

4 samples persquare kilometer

are taken.

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