| 民勤荒漠绿洲植被覆盖对地下水和降水变化的响应 |
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| 引用本文： | 薛文瑞,杨自辉,张永,郭树江,王强强,张剑挥.民勤荒漠绿洲植被覆盖对地下水和降水变化的响应[J].中国农学通报,2022,38(8):102-109. |
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| 作者姓名： | 薛文瑞 杨自辉 张永 郭树江 王强强 张剑挥 |
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| 作者单位： | 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 |
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| 基金项目： | 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)； |
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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。
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| 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 |
| 收稿时间： | 2021-04-10 |
Vegetation Cover Response to Groundwater and Precipitation Changes in Minqin Desert Oasis |
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| XUE Wenrui,YANG Zihui,ZHANG Yong,GUO Shujiang,WANG Qiangqiang,ZHANG Jianhui.Vegetation Cover Response to Groundwater and Precipitation Changes in Minqin Desert Oasis[J].Chinese Agricultural Science Bulletin,2022,38(8):102-109. |
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| Authors: | XUE Wenrui YANG Zihui ZHANG Yong GUO Shujiang WANG Qiangqiang ZHANG Jianhui |
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| Institution: | 1.Shiyanghe Forestry General Field, Wuwei City, Gansu Province, Minqin, Gansu 733300;2.Gansu Desert Control Research Institute/Gansu Minqin Desert Grassland Ecosystem Observation and Research Station, Lanzhou 730070;3.College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000 |
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| 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. |
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| Keywords: | Minqin desert oasis groundwater level precipitation vegetation coverage remote sensing monitoring |
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