为揭示三峡水库蓄水前后区域植被覆盖对气候变化的响应规律,基于SPOT NDVI和实际观测气象数据,采用偏相关系数法分析了三峡水库蓄水前后长江上游干流区间寸滩至宜昌段及外围100 km的气象因子与植被覆盖的相关性,同时对其非线性映射关系进行了研究。结果表明:在长江上游干流区间寸滩至宜昌段及外围100 km区域内,植被覆盖对气温和降水变化的动态响应具有较强的空间异质性,且气温是植被覆盖变化的主要驱动因素;二次函数可有效刻画植被覆盖对气温的响应规律,且较好地解释了植被覆盖-气温响应关系中的物理机制;植被覆盖对气温的响应规律在一定程度上受三峡水库蓄水影响,且随着与河道距离的增加,植被覆盖对气温的响应受蓄水影响程度递减。
Abstract
The aim of this research is to reveal the response of vegetation cover to climate change before and after the Three Gorges impoundment. The correlation between vegetation cover and climate factors in the upstream of the Yangtze River from Cuntan to Yichang and 100 km around was analyzed by using partial correlation coefficient method based on SPOT NDVI and observed meteorological data. Meanwhile, the non-linear mapping relationship was also investigated. Results unveiled high spatial heterogeneity of the dynamic response of vegetation cover to temperature and precipitation in the study area. Temperature is the major driving factor of vegetation cover variations. Second-order non-linear mapping effectively characterizes the response of vegetation cover to temperature, and well explains the physical mechanism of the relationship between vegetation cover and temperature. The response of vegetation cover to temperature is affected by the impoundment of the Three Gorges Reservoir to a certain extent, and the influence degree attenuates with the distancing from the river.
关键词
植被覆盖 /
NDVI /
气候响应 /
蓄水 /
三峡水库
Key words
vegetation cover /
normalized difference vegetation index(NDVI) /
climate response /
impoundment /
Three Gorges Reservoir
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基金
国家自然科学基金重点项目(U1865202,91547208);国家十三五重点研发计划项目(2016YFC0402205)
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