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中国农学通报

中国农学通报 ›› 2022, Vol. 38 ›› Issue (8): 102-109.doi: 10.11924/j.issn.1000-6850.casb2021-0379

• 资源·环境·生态·土壤·气象 • 上一篇    下一篇

民勤荒漠绿洲植被覆盖对地下水和降水变化的响应

薛文瑞1(), 杨自辉2, 张永3(), 郭树江2, 王强强2, 张剑挥2   

  1. 1甘肃省武威市石羊河林业总场,甘肃民勤 733300
    2甘肃省治沙研究所/甘肃民勤荒漠草地生态系统国家野外科学观测研究站,兰州 730070
    3兰州大学资源环境学院,兰州 730000
  • 收稿日期:2021-04-10 修回日期:2021-08-10 出版日期:2022-03-15 发布日期:2022-04-06
  • 通讯作者: 张永
  • 作者简介:薛文瑞,男,1964年出生,甘肃民勤人,高级工程师,硕士,研究方向：荒漠化防治研究。通信地址：733300 甘肃省民勤县民湖路112号,Tel：0935-4121524,E-mail： xwr13993552143@163.com。
  • 基金资助:
    国家自然基金项目“绿洲防护带植被变化对土壤水分的响应”(31960334);国家自然基金项目“石羊河流域下游干涸湖底风蚀特征及盐尘运动规律研究”(31760238);甘肃省科技支撑计划“民勤干旱沙区枣树生态经济林高效节水技术研究与示范(1604FKCA095)

Vegetation Cover Response to Groundwater and Precipitation Changes in Minqin Desert Oasis

XUE Wenrui1(), YANG Zihui2, ZHANG Yong3(), GUO Shujiang2, WANG Qiangqiang2, ZHANG Jianhui2   

  1. 1Shiyanghe Forestry General Field, Wuwei City, Gansu Province, Minqin, Gansu 733300
    2Gansu Desert Control Research Institute/Gansu Minqin Desert Grassland Ecosystem Observation and Research Station, Lanzhou 730070
    3College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000
  • Received:2021-04-10 Revised:2021-08-10 Online:2022-03-15 Published:2022-04-06
  • Contact: ZHANG Yong

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摘要：

荒漠植被的生长受制于地下水和大气降水。民勤绿洲地下水位持续下降,现大部分区域植被已无法利用地下水,降水量逐年呈略增趋势,降水逐渐成为植被生长的主要来源。研究民勤荒漠绿洲地下水位、降水量变化对植被的影响,对绿洲保护具有重大意义。本文利用2000—2018年的地下水观测数据、年降水数据结合遥感反演的NDVI数据,探究民勤绿洲年降水和地下水对植被覆盖的影响。研究结果表明：民勤绿洲地下水主要在15~30 m之间;影响绿洲植被覆盖的地下水埋深主要在1~10 m;随着地下水位下降,对植被覆盖影响降低;NDVI和年降水变化趋势一致,均呈现增加趋势,并且降水显著影响绿洲地表植被覆盖。

关键词: 民勤荒漠绿洲, 地下水位, 降水量, 植被覆盖度, 遥感监测

Abstract:

The growth of desert vegetation is constrained by groundwater and atmospheric precipitation. Vegetation in most areas of Minqin desert oasis is unable to use groundwater due to continuously declining groundwater level. Precipitation is increasing slightly year by year, and it has become the main water source of vegetation growth. Thus, it is of great significance for oasis protection to study the influence of groundwater level and precipitation on vegetation in Minqin desert oasis. This paper used groundwater observation data and annual precipitation data combined with NDVI data retrieved by remote sensing from 2000 to 2018, to explore the impact of annual precipitation and groundwater on vegetation cover in Minqin desert oasis. The results showed that the groundwater level in Minqin desert oasis ranged mainly from 15 to 30 m, and the buried depth of groundwater affecting vegetation cover in oasis ranged mainly from 1 to 10 m. The impact of groundwater on vegetation cover decreased with its level dropping. NDVI was consistent with the trend of annual precipitation, both showed increasing trends. Precipitation significantly affected the vegetation cover of oasis surface.

Key words: Minqin desert oasis, groundwater level, precipitation, vegetation coverage, remote sensing monitoring

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