基于SPOT NDVI指数、气象数据和数字高程模型,采用趋势分析法对1999—2015年长江流域上游地区植被覆盖空间格局和动态变化特征进行分析;利用偏相关系数法基于单个像元从动态角度研究植被覆盖对气候变化的响应;引入格网法从静态角度研究植被覆盖对气候和地形因子在整体空间格局上的响应。结果表明:研究区的植被覆盖整体较好,高覆盖地区占66.14%,表现出东高西低的梯度分布特征;从动态角度考虑,植被覆盖对温度和降水变化的响应具有较强的空间异质性,不同地区植被覆盖对温度和降水变化的动态响应关系不同;从静态角度考虑,植被覆盖对温度、降水、高程和坡度的响应表现出显著的非线性关系,存在一定的响应阈值,且都具有西部地区响应明显、东部地区响应不明显的特征。研究结果将为制定适应气候和地形的综合植被管理和土地资源管理提供科学依据。
Abstract
The spatial patterns and dynamic changes of vegetation coverage in the upper reaches of the Yangtze River Basin from 1999 to 2015 are studied through trend analysis based on SPOT NDVI, meteorological data, and digital elevation model. The dynamics of vegetation coverage varying with climate is studied using the partial correlation coefficient method from a single pixel scale; the response of vegetation coverage to climate change and topographic factors in the overall spatial pattern is expounded from a static perspective using a grid method. Results reveal good overall vegetation coverage in the study area, distributing in a gradient from the east to the west with high-coverage areas accounting for 66.14% of the total area. From a dynamic point of view, the response of vegetation coverage to temperature and precipitation changes is of strong spatial heterogeneity. Qualitatively, the dynamic response of vegetation cover to temperature and precipitation changes differs in various regions. From a static point of view, vegetation coverage displays evident nonlinear relation with temperature, precipitation, elevation and slope in a threshold. The response of vegetation coverage is remarkable in the west, while unapparent in the east. The research findings will offer scientific basis for the formulation of comprehensive vegetation management and land resource management adapting to climate and topography.
关键词
植被覆盖 /
NDVI /
气候 /
地形 /
空间分布 /
长江流域上游
Key words
vegetation cover /
NDVI /
climate /
topography /
spatial distribution /
upper reaches of the Yangtze River
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基金
大学生创新创业训练计划项目(201710616088);四川省教育厅重点项目(16ZA0087)
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