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

doi:10.11924/j.issn.1000-6850.casb2021-0379

Abstract

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

CLC Number:

S812.1

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.

Figures/Tables 6

References 15

[1]	郑丹, 李卫红, 陈亚鹏, 等. 干旱区地下水与天然植被关系研究综述[J]. 资源科学, 2005, 27(4):160-167.
[2]	WEI K, WANG L. Reexamination of the aridity conditions in arid northwestern China for the last decade[J]. Journal of Climate, 2013, 26(23):9594-9602. doi: 10.1175/JCLI-D-12-00605.1 URL
[3]	WEI X, SU X S. Challenges and impacts of climate change and human activities on groundwater-dependent ecosystems in arid areas-A case study of the Nalenggele alluvial fan in NW China[J]. Journal of Hydrology, 2019:376-385.
[4]	AINIWAER M, DING J, WANG J, et al. Spatiotemporal dynamics of water table depth associated with changing agricultural land use in an arid zone oasis[J]. Water, 2019, 11(4):673. doi: 10.3390/w11040673 URL
[5]	CHEN Y, LI W, DENG H, et al. Changes in central asia's water tower: past, present and future[J]. Scientific reports, 2016.
[6]	王文, 王靖淑, 陶奕源, 等. 人类活动对水文干旱形成与发展的影响研究进展[J]. 水文, 2020, 40(3):1-8.
[7]	王希义, 徐海量, 潘存德, 等. 2000-2014年塔里木河下游地下水补给量及合理需求量[J]. 水资源保护, 2017, 33(4):32-39.
[8]	王红瑞, 洪思扬, 秦道清. 干旱与水资源短缺相关问题探讨[J]. 水资源保护, 2017, 33(5):1-4.
[9]	孟婧莹, 康博, 杨浩北, 等. 基于GIS平台的地下水埋深与植被盖度响应关系研究[J]. 节水灌溉, 2012, 6:30-34.
[10]	LIU S, LI W, QIAO W, et al. Effect of natural conditions and mining activities on vegetation variations in arid and semiarid mining regions[J]. Ecological indicators, 2019, 103(AUG.):331-345. doi: 10.1016/j.ecolind.2019.04.034 URL
[11]	齐蕊, 王旭升, 万力, 等. 地下水和干旱指数对植被指数空间分布的联合影响:以鄂尔多斯高原[J]. 地学前沿, 2017, 24(02):265-273.
[12]	管子隆, 吕爱锋, 贾绍凤, 等. 格尔木河中游地区植被覆盖与地下水埋深关系研究[J]. 南水北调与水利科技, 2018, 16(3):86-93.
[13]	杨自辉, 方峨天, 刘虎俊, 等. 民勤绿洲边缘地下水位变化对植物种群生态位的影响[J]. 生态学报, 2007, 27(11):4900-4906.
[14]	杨自辉, 高志海. 荒漠绿洲边缘降水和地下水对白刺群落消长的影响[J]. 应用生态学报, 2000, 11(6):927-930.
[15]	PENG D, ZHOU T. Why was the arid and semiarid northwest China getting wetter in the recent decades?[J]. J.Geophys.Res.Atmos, 2017, 122:9060-9075.