摘要
【目的】探索植被时空演化规律和机理,为揭示区域环境变化奠定基础。【方法】利用SPOT/VEGETATION数据,辅以Theil-Sen Median趋势分析、回归分析以及残差分析等方法,探索2000—2018年四川省植被覆盖时空变化趋势,并揭示其影响因素。【结果】近二十年四川省植被覆盖呈显著增加趋势,增速为6.4%/10a,其中2006—2012年植被覆盖呈波动趋势;植被覆盖空间格局呈“东高西低”的分布特征,城镇化进程和高海拔地区气候对植被覆盖有剧烈干扰;四川省植被覆盖呈增加趋势的面积比例为72.45%,呈减少趋势的面积占比27.55%,植被状况改善较显著。四川省18个地级市中,雅安市、乐山市、攀枝花市、达州市、宜宾市、巴中市和广元市的植被改善状态较好。四川省海拔0~1000、1000~3000 m是植被恢复最显著的区域。【结论】通过剥离自然、人类活动因素发现,人类活动是导致四川省植被覆盖变化的主要因素,气候因素是影响四川省植被覆盖变化的次要因素。研究结果可为四川省生态保护和修复工程的科学布局提供依据。
【Objective】In order to lay a foundation for revealing regional environmental changes, the laws and mechanisms of vegetation spatiotemporal evolution were explored. 【Method】Based on SPOT/VEGETATION data, the temporal and spatial change trend of vegetation cover was explored and its influencing factors was revealed by using Theil Sen median trend analysis, regression analysis and residual analysis in Sichuan province from 2000 to 2018. 【Result】The vegetation cover in Sichuan province has increased significantly in recent 20 years, with a growth rate of 6.4%/10a, of which the vegetation cover decreased in a fluctuation way from 2006 to 2012. Moreover, the spatial pattern of vegetation cover showed a trend of high in the east and low in the west in Sichuan province. The process of urbanization and high-altitude climate had a severe interference with vegetation cover. In addition, the area proportion of increasing vegetation cover in Sichuan(72.45%) was about 11 times that of decreasing(27.55%), and the vegetation condition was improved significantly. The vegetation cover changes between 18 prefecture-level cities and different elevation zones in Sichuan province were counted. Among them, Ya'an, Leshan, Panzhihua, Dazhou, Yibin, Bazhong and Guangyuan, and the elevation range of 0-1000 and 1000-3000 meters were the most significant areas of vegetation recovery. Among the 18 prefectural cities, Ya'an city, Leshan city, Panzhihua city, Dazhou city, Yibin city, Bazhong city and Guangyuan city, as well as the altitude range of 0-1000 and 1000-3000 meters, were the most significant areas of vegetation restoration. 【Conclusion】 By separating the interaction of natural and human factors, it is found that human activities are the main factors leading to vegetation cover change(fluctuated reduction), and climate is the secondary factor affecting vegetation cover change(overall growth trend) in Sichuan province. The findings are helpful to provide decision-making basis for scientifically formulating vegetation management and utilization strategy and realizing the coordinated development of environment and economy in Sichuan province.
作者
孙炼
SUN Lian(Environment Information Center of Sichuan,Chengdu 610000,China)
出处
《西南农业学报》
CSCD
北大核心
2023年第5期1082-1089,共8页
Southwest China Journal of Agricultural Sciences
基金
国家自然科学基金项目(42001090)。
关键词
植被覆盖
时空变化
影响因素
人类活动
四川省
Vegetation cover
Temporal and spatial change
Driving factor
Human activities
Sichuan
