江西吉安市近20a植被覆盖度时空演变的特征及驱动因素分析  

Analysis of Characteristics and Driving Factors of Spatiotemporal Evolution of Vegetation Coverage in Ji’an City,Jiangxi Province over the Past 20 Years

作　　者：鲁金萍 李满根[1] 多玲花 陈念楠 LU Jinping;LI Mangen;DUO Linghua;CHEN Liannan(School of Earth Sciences,East China University of Technology,330013,Nanchang,PRC;School of Surveying and Geoinformation Engineering,East China University of Technology,330013,Nanchang,PRC)

机构地区：[1]东华理工大学地球科学学院,南昌330013 [2]东华理工大学测绘与空间信息工程学院,南昌330013

出　　处：《江西科学》2024年第5期974-981,1059,共9页Jiangxi Science

基　　金：江西省省级财政出资地质勘查项目(20220014)。

摘　　要：植被覆盖度是评价生态质量和制定环保政策的关键指标。系统性地了解植被覆盖度的状况对制定和实施生态环境保护政策至关重要。利用2001—2023年同(近)时相的陆地卫星Landsat-5 TM和Landsat-8 OLI影像,计算植被覆盖度,并采用变异系数、Mann-Kendall趋势检验及Theil-Sen Median趋势和地理探测器分析了吉安市2001—2023年植被覆盖度时空演变规律及其驱动因素,利用马尔科夫链模型预测未来植被覆盖度演变。结果显示,吉安市植被覆盖度演变趋势可以分为2个阶段:2001—2007年,呈现出高覆盖面积减少;2009—2023年,中高植被覆盖面积逐渐增加。根据变异系数的计算显示,河流、湖泊和城市周边的植被覆盖度波动范围较大,20 a间吉安市植被覆盖度明显改善,吉安市未来植被覆盖度继续呈改善趋势。海拔、温度、降水是影响区域内植被覆盖度的主导环境因子,多因子交互背景下,海拔与地貌类型、海拔与降水这2对组合是影响吉安市植被覆盖度变化的主要驱动因子。Vegetation coverage is a key indicator for evaluating ecological quality and formulating environmental policies.A systematic understanding of the state of vegetation coverage is essential for the development and implementation of ecological and environmental protection policies.This paper utilizes Landsat-5 TM and Landsat-8 OLI satellite images from 2001 to 2023 to calculate vegetation coverage.It employs the coefficient of variation,Mann-Kendall trend test,Theil-Sen Median trend and geographic detector to explore the spatiotemporal evolution and its driving factors of vegetation coverage in Ji’an city between 2001 and 2023.The Markov chain model is used to predict future vegetation coverage dynamics.The results indicate that the evolution trend of vegetation coverage in Ji’an city can be divided into two stages:from 2001 to 2007,there was a decrease in high coverage areas;from 2009 to 2023,there was a progressive increase in medium to high vegetation coverage areas.Based on the coefficient of variation,it was found that vegetation coverage around rivers,lakes and urban areas showed larger fluctuations;over 20 years,the vegetation coverage in Ji’an city has significantly improved,and it continues to show a trend of improvement in the future.Elevation,temperature and precipitation are the dominant environmental factors impacting vegetation cover in the region,under the interaction of multiple factors,the combinations of elevation and geomorphologic types,as well as elevation and precipitation,are the main driving factors affecting vegetation coverage changes in Ji’an city.

关 键 词：陆地卫星 植被覆盖度 时空演变 地理探测器 吉安市 

分 类 号：Q948[生物学—植物学]