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2000-2018年赣江上游植被覆盖度时空演化及其对气候变化的响应
刘明霞1, 刘友存2, 陈明2, 李奇2,3, 梁旗2, 邹杰平2, 乔丽潘古丽·吐尔洪2
1.江西理工大学 建筑与测绘工程学院, 江西 赣州 341000;2.江西理工大学 资源与环境工程学院, 江西 赣州 341000;3.江西环境工程职业学院 生态建设与环境保护学院, 江西, 赣州 341000
摘要:
[目的] 对赣江上游植被覆盖度时空演化及其对气候变化响应的研究,为区域的生态环境保护提供科学依据和数据支撑。[方法] 基于MODIS NDVI数据,结合年平均气温和年降水量数据,运用趋势分析、变异系数、Hurst指数与相关分析等方法对赣江上游2000—2018年的植被覆盖度时空演化及其对气候变化的响应进行了分析。[结果] ①赣江上游植被覆盖度呈显著增加趋势,增速为5.21%/10 a,空间上呈现四周高中间低的特征,且以高植被覆盖为主;研究区植被覆盖度呈极显著和显著增加的分别占25.59%和39.7%,极显著和显著减少的分别占1.32%和2.46%,而变化不显著的占57.84%;②研究区植被覆盖总体上比较稳定,平均变异系数为14.73%;Hurst分析显示赣江上游植被变化反持续性要强于持续性,总体上以弱反持续性为主;③研究区植被生长总体上受气温影响强于降水量,但存在空间差异。[结论] 赣江上游植被覆盖度变化较小,未来将呈微弱下降趋势,气温是影响植被生长的主要气候因子。
关键词:  植被覆盖度  时空变化  气候变化  趋势分析  赣江上游
DOI:10.13961/j.cnki.stbctb.2020.05.041
分类号:X171;TP79
基金项目:国家自然科学基金项目“稀土矿区典型流域水沙过程与氨氮及重金属多界面迁移机制研究”(41861002);江西省自然科学资助项目(20181BAB203026);赣州市创新人才项目(赣市科发2019[60]号);江西省教育厅科技项目(GJJ190443)和江西省“双千计划”创新人才项目(JXSQ2018106054)。
Spatiotemporal Evolution of Vegetation Coverage and Its Response to Climate Change in Upper Reaches of Ganjiang River Basin During 2000-2018
Liu Mingxia1, Liu Youcun2, Chen Ming2, Li Qi2,3, Liang Qi2, Zou Jieping2, Qiaolipanguli·Tuerhong2
1.School of Architectural and Surveying&Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China;2.School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China;3.School of Ecological Construction and Environmental Protection, Jiangxi Environmental Engineering Vocational College, Ganzhou, Jiangxi 341000, China
Abstract:
[Objective] The spatiotemporal evolution of vegetation coverage and its response to climate change in the upper reaches of the Ganjiang River basin were studied to provide a scientific basis and data support for regional ecological environmental protection.[Methods] Based on MODIS normalized difference vegetation index (NDVI) data, combined with annual average temperature and annual precipitation data, the trend analysis, coefficient of variation, Hurst index, and correlation analysis were used to analyze the spatiotemporal evolution of vegetation coverage and its response to climate change in the upper reaches of the Ganjiang River basin from 2000 to 2018.[Results] ① The fractional vegetation coverage in the upper reaches of the Ganjiang River basin showed a significant increase, with a growth rate of 5.21%/10 a. Spatially, the vegetation coverage showed the distribution characteristics of being low in the middle and high in the surroundings, mainly with high vegetation coverage. The fractional vegetation coverage in the study area showed an extremely significant increase and a significant increase account for 25.59% and 39.70%, respectively, and an extremely significant decrease and a significant decrease account for 1.32% and 2.46%, respectively. Insignificant change accounts for 57.84%. ② The vegetation coverage was generally stable in the study area, with an average coefficient of variation of 14.73%. Hurst analysis showed that the antisustainability of vegetation changes in the upper reaches of the Ganjiang River basin was stronger than the sustainability, and weak antisustainability was mainly dominant. ③ The vegetation growth in the study area was generally more affected by temperature than by precipitation, but there were spatial differences.[Conclusion] The fractional vegetation coverage in the upper reaches of Ganjiang River basin changes little and will decrease slightly in the future. Temperature is the main climate factor affecting vegetation growth.
Key words:  fractional vegetation coverage  spatiotemporal variation  climate change  trend analysis  upper reaches of Ganjiang River basin