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台湾省植被NDVI随海拔高度的变化及其气候响应
林日志, 钟亮, 刘小生
江西理工大学 建筑与测绘工程学院, 江西 赣州 341000
摘要:
[目的] 揭示台湾省陆地植被生态系统随海拔高度的变化趋势及其响应程度,为区域可持续发展、生态环境保护提供理论依据。[方法] 基于台湾省1998-2018年SPOT/VEGETATION NDVI卫星遥感数据、气象及DEM数据,结合相关分析法、回归分析法等数理统计方法,对气候变化下的台湾省植被归一化植被指数(NDVI)变化趋势及区域响应进行了分析。[结果] 1998-2018年台湾省植被NDVI均值增长率为5.09%;台湾省不同高程范围所占的面积比例差异较大,<500 m区域的面积比例高达52.49%,>3 600 m区域的面积比例仅为0.01%,且NDVI均呈现较低值,分别为0.72和0.73;1998-2018年台湾省海拔除>3 600 m外,其他海拔高程范围NDVI均值增长明显(p<0.001);在500~3 600 m高程范围内,NDVI年均值与气温、降雨相关关系显著(p<0.05)。[结论] 海拔越高,植被生长状况对降雨的变化较气温更为敏感。
关键词:  归一化植被指数(NDVI)  海拔高度  气候因子  台湾省
DOI:10.13961/j.cnki.stbctb.2020.01.044
分类号:S157.2;Q948
基金项目:国家自然科学基金项目"基于支持向量机的岩质边坡滑移变形智能预测模型研究"(41561091);江西省科技厅重点项目"云GIS支持下的防汛抗洪空间数据高效管理技术及应用研究"(20142BBE50024)
Change of Vegetation NDVI with Altitude and Its Climatic Response in Taiwan Province
Lin Rizhi, Zhong Liang, Liu Xiaosheng
School of Architectural and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China
Abstract:
[Objective] To provide a theoretical basis for regional sustainable development and ecological environmental protection, the changing trend with altitude of Taiwan's terrestrial vegetation ecosystem and its response to climatic were investigated.[Methods] Based on SPOT/VEGETATION NDVI satellite remote sensing data, meteorological, and digital elevation model (DEM) data from 1998-2018, we combined a regression analysis and correlation analysis to assess the normalized difference vegetation index(NDVI) trend and regional response of vegetation in Taiwan Province under climate change.[Results] The average growth rate of NDVI of vegetation in Taiwan Province from 1998 to 2018 was 5.09%; The proportion of area occupied by different elevation ranges in Taiwan Province was quite different, the area proportion <500 m area was as high as 52.49%, the area proportion >3 600 m area was only 0.01%, and NDVI in the two altitude ranges showed lower values, 0.72 and 0.73; From 1998 to 2018, except for the altitude of >3 600 m, the mean value of NDVI in other altitude ranges increased significantly (p<0.001). In the elevation range of 500-3 600 m, the annual mean of NDVI was significantly correlated with temperature and rainfall (p<0.05).[Conclusion] The higher the altitude, the more sensitive is the growth of vegetation to the change of rainfall as compared to the change of temperature.
Key words:  normalized difference vegetation index(NDVI)  altitude  climate factors  Taiwan Province