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应用生态学报 ›› 2018, Vol. 29 ›› Issue (11): 3577-3586.doi: 10.13287/j.1001-9332.201811.001

• 研究报告 • 上一篇    下一篇

宁夏东部荒漠草原灌丛引入下土壤水分空间异质性

赵亚楠1, 周玉蓉1, 王红梅1,2*   

  1. 1宁夏大学农学院, 银川 750021;
    2西北退化生态系统恢复与重建教育部重点实验室, 银川 750021
  • 收稿日期:2018-02-11 出版日期:2018-11-20 发布日期:2018-11-20
  • 通讯作者: *E-mail: whm_826@163.com
  • 作者简介:赵亚楠, 男, 1995年生, 硕士研究生. 主要从事草原生态、资源与环境研究. E-mail: nxuzyn@163.com
  • 基金资助:

    本文由宁夏高等学校科研项目(NGY2015054)、宁夏科技支撑计划项目(2015惠民计划)、国家自然科学基金项目(31060325)和宁夏高等学校一流学科建设项目(NXYLXK2017A01)资助

Spatial heterogeneity of soil water content under introduced shrub (Caragana korshinskii) in desert grassland of the eastern Ningxia, China

ZHAO Ya-nan1, ZHOU Yu-rong1, WANG Hong-mei1,2*   

  1. 1School of Agriculture, Ningxia University, Yinchuan 750021, China;
    2Ministry of Education Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwest China, Yinchuan 750021, China
  • Received:2018-02-11 Online:2018-11-20 Published:2018-11-20
  • Contact: *E-mail: whm_826@163.com
  • Supported by:

    This work was supported by the Ningxia Higher Education Institutions Research Fund (NGY2015054), the Ningxia Science-technology Support Plan Project (the Public-Benefit Plan 2015), the National Natural Science Foundation of China (31060325), and the Ningxia Higher Education Institutions First-class Discipline Construction Project (NXYLXK2017A01).

摘要: 结合地理信息系统(GIS),运用经典统计学和地统计学方法对宁夏东部荒漠草原人工灌丛引入下0~200 cm土层土壤水分空间异质性进行研究.结果表明: 0~200 cm土层土壤含水量为0.6%~19.0%,均值为4.4%,土壤水分含量较低,变异系数为49.5%~86.3%,属于中等变异.不同土层半变异函数的最佳理论模型分别为:0~60、80~120 cm各层土壤水分符合球状模型,60~80 cm符合指数模型,120~200 cm符合高斯模型.不同土层土壤含水量均呈不同程度的空间相关,0~40、60~80、120~200 cm各层土壤水分的块金系数C0/(C0+C)为26.1%~49.9%,为中等程度空间相关;40~60、80~100、100~120 cm各层土壤含水量的块金系数为15.5%~22.1%,具强烈空间相关.0~200 cm不同土层土壤水分含量变程不同,0~20 和 20~40 cm土层变程较大,为37.10~45.18 km,40~200 cm各层土壤含水量的变程较小,为3.58~8.66 km.荒漠草原人工灌丛引入过程中加速土壤水分利用和深层水分消耗,导致土壤水分的空间异质性和破碎化程度加强,且对深层次土壤水分作用更强.

Abstract: Combined with geographic information system (GIS) data, the spatial heterogeneity of soil water in the 0-200 cm soil layer of the desert steppe with the introduction of the shrub Caragana korshinskii in eastern Ningxia was studied by classical statistical and geostatistical methods. It was found that the soil water content of each soil layer in the 0-200 cm profile was relatively low, ranging from 0.6% to 19.0% (averaged 4.4%). The coefficient of soil water content variation ranged from 49.5% to 86.3%, which indicated moderate spatial heterogeneity. The variation of soil water content at the 0-60 cm and 80-120 cm soil layers fitted the spherical model, while that at the 60-80 cm soil layer fitted the exponential model and that at the 120-200 cm soil layer fitted the Gaussian model. Soil water content at different soil layers showed different degrees of spatial autocorrelation. The nugget/sill [C0/(C0+C)] of soil water content in the 0-40, 60-80, and 120-200 cm soil layers ranged from 26.1% to 49.9%, with moderate spatial correlations. The nugget/sill of soil water content in the 40-60 cm, 80-100 cm, and 100-120 cm soil layers ranged from 15.5% to 22.1%, with strong spatial correlations. The scale of spatial heterogeneity in soil water content (A0) varied among soil layers. The A0 was relatively large in the 0-20 and 20-40 cm soil layers (37.10-45.18 km) and small in the 40-200 cm soil layers (3.58-8.66 km). The results indicated that the introduction of C. korshinskii shrubs into desert grassland for vegetation recovery in recent decades have depleted soil water and accelerated the depletion of soil water in the deep layer (40-200 cm), leading to spatial heterogeneity and fragmentation of soil water (0-200 cm) with stronger effects at deep soil layer.