| 黄土丘陵区土壤有机碳含量对侵蚀坡面表层土壤含水量时空变化的影响 |
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| 引用本文： | 夏彬,朱世硕,郝旺林,许明祥.黄土丘陵区土壤有机碳含量对侵蚀坡面表层土壤含水量时空变化的影响[J].水土保持学报,2020,34(3):175-181. |
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| 作者姓名： | 夏彬 朱世硕 郝旺林 许明祥 |
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| 作者单位： | 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 |
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| 基金项目： | 国家自然科学基金项目（41771318，41830758）；国家重点研发计划项目（2017YFC0506503） |
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| 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。
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| 关 键 词： | 表层土壤含水量 侵蚀坡面 有机碳水平 不同季节 变异性 |
| 收稿时间： | 2020/1/17 0:00:00 |
| 修稿时间： | 2020/2/15 0:00:00 |
Effects of Soil Organic Carbon Content on Temporal and Spatial Changes of Surface Soil Water Content on Eroded Slope in the Loess Hilly Region |
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| XIA Bin,ZHU Shishuo,HAO Wanglin,XU Mingxiang.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].Journal of Soil and Water Conservation,2020,34(3):175-181. |
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| Authors: | XIA Bin ZHU Shishuo HAO Wanglin XU Mingxiang |
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| Institution: | 1. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100;2. University of Chinese Academy of Sciences, Beijing 100049;3. College of Forestry, Northwest A&F University, Yangling, Shaanxi 712100 |
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| 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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| Keywords: | surface soil water content erosion slope organic carbon levels different seasons variability |
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