干旱区研究

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2014 , Vol. 31 >Issue 5: 812 - 818

DOI: https://doi.org/10.13866/j.azr.2014.05.05

水土资源

绿洲边缘土壤水分与有机质空间分布及变异特征

  • 张帅普 ,
  • 邵明安
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  • 1.西北农林科技大学资源环境学院,陕西 杨凌 712100;
    2.西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西 杨凌 712100;
    3.中国科学院地理科学与资源研究所,北京 100101
张帅普(1989－),男,在读硕士,主要研究方向为生态环境工程. E-mail:sir858@126.com
邵明安. E-mail:mashao@ms.iswc.ac.cn

收稿日期: 2013-04-07

  修回日期: 2013-05-08

  网络出版日期: 2014-09-25

基金资助

国家重大研究计划重点支持项目(91025018)资助

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Spatial Variability of Soil Moisture Content and Soil Organic Matter Content in Oasis Marginal Zone

  • ZHANG Shuai-pu ,
  • SHAO Ming-an
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  • 1. College of Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi Province, China;
    2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, Shaanxi Province, China;
    3. Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China

Received date: 2013-04-07

  Revised date: 2013-05-08

  Online published: 2014-09-25

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摘要

在黑河中游绿洲边缘由北向南选取的1 200 m × 250 m长方形沙漠、林地和耕地3种土地类型为研究区,利用经典统计学方法对其土壤水分与有机质空间分布及变异性进行研究。结果表明:由沙漠向耕地过渡,土壤水分与有机质含量上升,平均值变化幅度分别为9.36%和4.92 g·kg-1。在水平方向上,随着样带位置南移,0~200 cm土层土壤水分与有机质变异程度均表现为先增大后减小,且林地>耕地>沙漠。在垂直方向上,随土壤深度增加,土壤有机质变异性减弱,土壤含水量变异性在0~100 cm范围内增强,之后亦减弱。绿洲边缘土壤有机质含量对土壤水分影响显著,土壤含水量随有机质含量增加呈对数增长,适当增加有机质含量可以提高土壤蓄水能力。

关键词： 土壤水分; 土壤有机质; 空间分布; 变异特征; 绿洲边缘

本文引用格式

张帅普 , 邵明安 . 绿洲边缘土壤水分与有机质空间分布及变异特征[J]. 干旱区研究, 2014 , 31(5) : 812 -818 . DOI: 10.13866/j.azr.2014.05.05

Abstract

In this study, a rectangular area (1 200 m × 250 m) was delimited to carry out a case study on the spatial patterns of soil moisture and organic matter contents in oasis marginal zone in middle reaches of the Heihe River, where there are three land types, i.e. the desert, woodland and cultivated land. Spatial variations of soil moisture and organic matter contents were studied by the conventional statistical analysis. The results showed that the soil moisture and organic matter contents were increased from desert to oasis, and the average values of change extent were 9.36% and 4.92 g·kg-1 respectively. Horizontally, the soil moisture and organic matter contents in soil layer of 0-200 cm in depth were increased at first and then decreased with shifting the sample strips southward, and they were in an order of woodland > cultivated land > desert. Vertically, the variability of soil organic matter content was decreased with the increase of soil depth, but that of soil moisture content was increased in soil layer of 0-100 cm in depth and then decreased. In the oasis marginal zone, there was a significant positive correlation between soil organic matter content and soil moisture content, especially in upper soil layer. These indicated that the increase of soil organic matter content could improve the soil water storage capacity.

Key words： soil moisture content; soil organic matter content; spatial distribution; variability; oasis marginal zone

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