摘要
土壤性质是影响坡地降雨入渗、产流及土壤水再分布的重要因素。研究坡地土壤性质的空间变异特征，有助于进一步研究坡地降雨入渗产流规律。通过对20m×24m径流小区土壤性质的空间变异特征分析，结果表明：（1）沿坡面，从坡上向坡下砂粒含量逐渐减少，土壤质地总体变细；有机质含量变化不大；土壤容重和饱和导水率均呈弱变异性。（2）在剖面内，从表层（0～10cm）向深层（120—130cm），土壤质地逐渐变粗，为弱变异性；有机质含量变化趋势明显，从地表向深层依次减小，坡上和坡下表层有机质含量分别高出深层约8．6和7．6倍，为中等变异性；土壤容重呈波状增大的变化，变化范围为1．08-1．63g／cm^3，整体为弱变异性；土壤饱和导水率最大值出现在表层，向深层有呈波状减小的变化趋势，且波动强度依次减小，变异强度大，属强变异性，其大小属“高级”水平。
The soil character is the mail influential factor of rain infiltration - runoff - redistribution of the soil water. The studies on the spatial variability of slope - land soil character can accelerate or deepen the studies on rainfall - infiltration - runoff rule on the slope - land. Spatial variation of slope - land soil character of some soil properties at the runoff plot, 20m×24m,were studied with the statistical analysis. The results show that the content of sand gradually decrease from upper slope to lower slope, and the soil texture become fine in the mass , but organic matter content become no visible, and bulk density and saturated hydraulic conductivity have small variability. In the soil profile the soil texture gradually become coarse and has small variability and organic matter content evidently decrease and the trend is visible from upper layer（0 ～ 10cm） to lower layer（ 120 ～ 130cm） and the content apiece decrease 8.6 and 7.6 times. And that has moderate variability. Alike from upper layer to lower layer bulk density increase undulated from 1.08g/cm^3 to 1.63 g/cm^3 and has small variability in the mass. But saturated hydraulic conductivity has contrary change and the magnitude belongs to the biggest level. And in the soil profile saturated hydraulic conductivity has sixange variability.
出处
《亚热带水土保持》
2007年第2期1-4,29,共5页
Subtropical Soil and Water Conservation
关键词
红壤
土壤容重
饱和导水率
空间变异
red region
bulk density
saturated hydraulic conductivity
spatial variability
