2000-2019年宁东北部NDVI时空变化及其影响因素
Spatio-temporal Variation and Influencing Factors of NDVI in Northern Ningdong from 2000 to 2019
投稿时间:2021-02-26  修订日期:2021-02-26
DOI:
中文关键词:  NDVI  时空变化  地下水位埋深  气候因素
英文关键词:NDVI  temporal and spatial variation  water table depth  meteorological factors
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位邮编
田华 西安科技大学地质与环境学院 710054
李金芳 西安科技大学地质与环境学院 710054
杨嘉懿 西安科技大学地质与环境学院 
谢祖峰 西安科技大学地质与环境学院 
张晴 西安科技大学地质与环境学院 
蒲芳 西安科技大学地质与环境学院 
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中文摘要:
      [目的]探究宁东北部植被指数的变化及其影响因素,查明植被指数NDVI的时空变化规律及其与地下水位埋深、气温、降水量和蒸发量等因素之间的响应关系。[方法]应用MODIS NDVI数据结合同时期气象和区域地下水埋深数据,通过ENVI、ArcGIS等软件对数据进行统计分析。[结果](1)2000-2019年宁东北部植被指数整体呈现增长趋势,增长率为68.41%。(2)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%。(3)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4m时,植被指数达到最大。[结论]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。
英文摘要:
      [Objective] The variation laws and influencing factors of Normalized Difference Vegetation Index (NDVI) in northern Ningdong were studied to find out the temporal and spatial variation laws of NDVI and its response relation with factors including the water table depth, temperature, precipitation, and evaporation. [Methods] The data which based on MODIS NDVI and the simultaneous meteorological and regional water table depth were statistically analyzed through ENVI, ArcGIS and other software. [Results](1)The vegetation index in northern Ningdong was gradually increasing from 2000 to 2019,the growth rate was 68.41%. (2)The vegetation index in the region gradually increased from southeast to northwest, and the area with NDVI greater than 0.3 in the northwest increased by 15.63%. (3)NDVI was positively correlated with temperature and precipitation, and negatively correlated with water table depth and evaporation. The vegetation index reached the maximum when the water table depth was 4m. [Conclusion] The variation of the vegetation index was affected by both water table depth and meteorological factors, the influence degree of each factor to NDVI was shown as following: evaporation> water table depth>precipitation>temperature.
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