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冰川冻土 ›› 2014, Vol. 36 ›› Issue (1): 88-94.doi: 10.7522/j.issn.1000-0240.2014.0011

• 冰冻圈与全球变化 • 上一篇    下一篇

祁连山退化高寒草甸土壤水分空间变异特征分析

张泉1, 刘咏梅1, 杨勤科1, 王雷1, 莫重辉2, 李京忠3   

  1. 1. 西北大学 城市与环境学院, 陕西 西安 710127;
    2. 青海大学 农牧学院, 青海 西宁 810016;
    3. 许昌学院 城市与环境学院, 河南 许昌 461000
  • 收稿日期:2013-08-03 修回日期:2013-11-28 出版日期:2014-02-25 发布日期:2014-03-18
  • 通讯作者: 刘咏梅,E-mail:liuym@nwu.edu.cn E-mail:liuym@nwu.edu.cn
  • 作者简介:张泉(1989-),男,陕西西安人,2012年毕业于西北大学,现为硕士研究生,主要从事区域生态水文环境研究. E-mail:zhangquanzq@126.com
  • 基金资助:

    农业部公益性行业专项资助项目(201203062);国家自然科学基金项目(41171225)资助

Analysis of the spatial variability of soil moisture in degrading alpine meadow in the Qilian Mountains

ZHANG Quan1, LIU Yongmei1, YANG Qinke1, WANG Lei1, MO Chonghui2, LI Jingzhong3   

  1. 1. College of Urban and Environmental Sciences, Northwest University, Xi'an 710127, China;
    2. Agriculture and Animal Husbandry College, Qinghai University, Xining 810016, China;
    3. College of Urban and Environmental Sciences, Xuchang University, Xuchang 461000, Henan, China
  • Received:2013-08-03 Revised:2013-11-28 Online:2014-02-25 Published:2014-03-18

摘要:

利用传统统计学方法和地统计学方法,对祁连山地区受到过度放牧影响而退化为以狼毒为优势种的高寒草甸的土壤水分垂直变异特征、水平空间异质性以及分布特征进行了系统分析. 结果表明:在垂直方向上,0~100 cm土壤水分含量随深度的增加而逐渐减少,土壤水分含量的变化速度随深度的增加也趋于减少;土壤水分分布的变异系数在浅层和深层土壤较大,在中层土壤较小. 在水平方向上,0~40 cm土壤水分具有中等空间变异性,其中10~20 cm土壤水分变异性主要受根系的影响,随机部分引起的变异性最大;而在其他土壤层,随着深度的增加土壤水分含量由随机部分引起的空间异质性程度减弱,由空间自相关部分引起的异质性程度增强. 整体上,土壤水分含量与微地形关系密切,与距离溪流的远近程度正相关,与高程分布负相关.

关键词: 高寒草甸, 狼毒, 土壤水分, 空间变异特征, 地统计学

Abstract:

Traditional statistics and geostatistics methods are used to study the soil moisture variation characteristics in vertical direction, spatial heterogeneity in horizontal direction and spatial distribution in the overgrazed and the nocuous grass invading alpine meadow in the Qilian Mountains. The results show that in vertical direction, soil moisture decreases with depth, and so does the variation rate. Coefficient of variation of the soil moisture distribution in superficial layer and deep layers are larger than that in middle layers. In horizontal direction, the soil moisture in 0~40 cm depth range possesses a feature of moderate variability. The 10~20 cm depth range is mainly affected by root system, with the maximum variability in the random section. For the rest layers, soil moisture due to variability of random section decreases with depth, while that due to the autocorrelation section increases. In macroscopic view, content of soil moisture is closely related to micro-topography, with positive correlation with the distance to rivers and negative correlation with the height above sea level.

Key words: alpine meadow, Stellera chamaejasme, soil moisture, spatial variability, geostatistics

中图分类号: 

  • S152.7