Effects of Soil Organic Carbon Content on Temporal and Spatial Changes of Surface Soil Water Content on Eroded Slope in the Loess Hilly Region

XIA Bin; ZHU Shishuo; HAO Wanglin; XU Mingxiang

doi:10.13870/j.cnki.stbcxb.2020.03.027

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Effects of Soil Organic Carbon Content on Temporal and Spatial Changes of Surface Soil Water Content on Eroded Slope in the Loess Hilly Region

更新时间：2025-03-12

- Effects of Soil Organic Carbon Content on Temporal and Spatial Changes of Surface Soil Water Content on Eroded Slope in the Loess Hilly Region
- Vol. 34, Issue 3, Pages: 175-181(2020)
- 作者机构：
  
  1. 中国科学院水利部水土保持研究所, 陕西杨凌,712100
  2. 中国科学院大学,北京,100049
  3. 西北农林科技大学林学院, 陕西杨凌,712100
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2020.03.027
  CLC： S278
- Published：2020
- 稿件说明：
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XIA Bin, ZHU Shishuo, HAO Wanglin, et al. Effects of Soil Organic Carbon Content on Temporal and Spatial Changes of Surface Soil Water Content on Eroded Slope in the Loess Hilly Region[J]. 2020, 34(3): 175-181.
DOI：

XIA Bin, ZHU Shishuo, HAO Wanglin, et al. Effects of Soil Organic Carbon Content on Temporal and Spatial Changes of Surface Soil Water Content on Eroded Slope in the Loess Hilly Region[J]. 2020, 34(3): 175-181. DOI： 10.13870/j.cnki.stbcxb.2020.03.027.

摘要

表层土壤含水量能敏感反映降雨、气温、侵蚀等环境要素的变化，明确表层土壤含水量时空变化特征可为农业生产及土壤环境效应评价等提供参考。以黄土丘陵区不同有机碳水平的侵蚀坡面为对象，连续监测了2016年11月至2018年3月0-5 cm土壤含水量的动态变化，结合降水资料，分析了不同土壤有机碳水平下侵蚀坡面沉积区、侵蚀区及对照区表层土壤含水量的变化特征。结果表明：（1）表层土壤含水量不同季节变化差异显著，夏季变幅最大，单日最大变幅可达14.3%，春、秋、冬季的单日最大变幅<8.0%。换言之，夏季是土壤水分变化的敏感期。（2）土壤有机碳水平、坡面部位、土壤温度对表层水分变异的影响程度因季节而异。（3）土壤侵蚀加剧了坡面表层土壤含水量变异，变异程度表现为沉积区 > 侵蚀区 > 对照（未侵蚀）区；侵蚀前后侵蚀区表层土壤含水量变化量与沉积区变化量的差值随有机碳水平升高从0.85%增加至9.81%。（4）侵蚀坡面表层土壤含水量的时空异质性随有机碳水平升高呈非线性变化趋势。

Abstract

Surface soil water content can sensitively reflect the changes of rainfall

temperature

erosion and other environmental factors. It can provide reference for agricultural production and evaluation of soil environmental effect to clarify the temporal and spatial variation characteristics of surface soil water content. In this study

the surface soil water content of 0-5 cm soil was continuously monitored from November 2016 to April 2018 on the eroded slopes with different soil organic carbon levels in the loess hilly region. And based on the precipitation data

the variation characteristics of surface soil water content in the sedimentary area

erosion area and control area of erosion slope with different soil organic carbon levels were analyzed. The results showed that: (1) The variation of surface soil water content was significant among different seasons

with the largest variation in summer. The maximum daily variation was 14.3% in summer

and the maximum daily variations in spring

autumn and winter were all less than 8.0%. In other words

summer was the sensitive period of soil water change.(2) The influence of soil organic carbon level

slope area and soil temperature on the variation of surface soil water content varied with seasons. (3) Soil erosion intensified the variation of surface soil water content on the slope

and the variation degree followed the order: sedimentary area > erosion area > control (non-erosion) area. With the increasing of soil organic carbon level

the difference of variation of surface soil water content before and after erosion in erosion area and that in sedimentary area increased from 0.85% to 9.81%.(4) The spatial-temporal heterogeneity of the surface soil water content on eroded slope showed a non-linear trend with the increasing of soil organic carbon level.

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