摘要
为探究宁东北部植被指数的变化及其影响因素,明确NDVI的时空变化规律及其与地下水位埋深、气温、降水量和蒸发量等水文气象因素之间的响应关系,应用MODIS NDVI数据结合同时期气象和区域地下水位埋深数据进行统计分析。结果表明:2000-2019年宁东北部植被指数整体呈现增长趋势(68.41%增长率);区域内植被指数由东南向西北逐渐变大,西北部NDVI大于0.3的面积增加了15.63%;NDVI与气温和降水量呈正相关关系,与地下水位埋深和蒸发量呈负相关关系,在地下水位埋深为3~4 m时,植被指数达到最大。研究区植被指数变化受地下水位埋深和气候因素的共同影响,各因素对NDVI的影响程度表现为蒸发量>地下水位埋深>降水量>气温。
In order to study the temporal and spatial variation of NDVI in northern Ningdong and figure out the relation with hydrological and meteorological factors including water depth, temperature, precipitation, and evaporation, the data of MODIS NDVI during 2000-2019 were used for statistical analysis. The results show that,(1) The vegetation index is gradually increased with the average growth rate of 68.41% during the study period.(2) The vegetation index gradually increases from southeast to northwest,with the northwest area that NDVI is greater than 0.3 increases by 15.63%.(3) The NDVI has positive correlation with temperature and precipitation, and negative correlation with water depth and evaporation. The vegetation index reaches the maximum point when the water depth is 3~4m. Conclusion: The variation of the vegetation index is affected by both water depth and meteorological factors, with the impacting order of: evaporation>water depth>precipitation>temperature.
作者
田华
李金芳
杨嘉懿
谢祖锋
张晴
蒲芳
TIAN Hua;LI Jinfang;YANG Jiayi;XIE Zufeng;ZHANG Qing;PU Fang(College of Geology and Enwironment,Xian University of Science and Technolog,Xian 710054,China)
出处
《水文》
CSCD
北大核心
2022年第3期102-108,共7页
Journal of China Hydrology
基金
国家自然科学基金资助项目(41202176,41672250)
地质勘查基金资助项目(S17-2-XJ07)
陕西省重点研发计划资助项目(2021SF-445)。
关键词
宁东北部
NDVI
时空变化
地下水位埋深
水文气象因素
Northern Ningdong
NDVI
temporal and spatial variation
water depth
hydrological and meteorological factors
作者简介
田华(1973-),女,陕西西安人,博士,副教授,主要研究方向为区域地下水开发与生态环境保护。E-mail院tianhua7366@163.com。
