西南地区植被动态变化的驱动力解析

曾兴兰; 陈田田

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中国环境科学 ›› 2023, Vol. 43 ›› Issue (12) : 6561-6570.

环境生态

西南地区植被动态变化的驱动力解析

曾兴兰¹, 陈田田^1,2

作者信息 +

Analysis of the driving forces of vegetation dynamic changes in southwest China

ZENG Xing-lan¹, CHEN Tian-tian^1,2

Author information +

文章历史 +

摘要

以归一化植被指数(NDVI)、土地利用、气候数据集为基础,综合集合经验模态分解、偏相关分析、分段线性回归等方法,在明晰区域植被变化特征的基础上阐明气候变化和城市扩张两大驱动要素对植被动态的影响.结果显示,1990~2018年,西南地区NDVI呈波动上升趋势,植被变绿趋势明显,在空间上表现东南高、西北低的分布格局.相较于太阳辐射和降水,气温对区域植被生长的影响力及范围均较大,约占区域总面积的64.6%,主要分布在研究区中部以及西部.西南地区土地城市化、经济城市化和人口城市化随时间推移均呈增加趋势,且空间分布格局较一致;在县域尺度上,经济、人口城市化与植被生长呈先增后降的非线性关系,土地城市化与植被生长呈负相关关系;在栅格尺度上,三类城市化与植被生长的关系保持不变,但是非线性阈值以及线性斜率差异明显.

Abstract

Based on the Normalized Difference Vegetation Index (NDVI), land use and climate datasets, this study analyzed the trend of change in vegetation growth and clarified the impact of climate change and urban expansion on vegetation dynamics in southwest China by the ensemble empirical mode decomposition, partial correlation analysis and segmented linear regression. The results showed that the NDVI in the southwest China fluctuating increased, indicating an obvious vegetation greening trend; spatially, the regions with high NDVI were distribution in the southeast part and the regions with low NDVI were concentrated at the northwest part. Compared to the solar radiation and precipitation, the influencing scale and degree of temperature on regional vegetation growth was relatively large, accounting for approximately 64.6% of the study area, mainly distributed in the central and western parts of the study area. The land urbanization, economy urbanization and demographic urbanization increased over time, and the spatial distribution of these three urbanizations was relatively consistent. At the county scale, the correlation between economic urbanization, demographic urbanization and vegetation growth increased firstly and then decreased, showing a nonlinear characteristic; while there was a negative correlation between land urbanization and vegetation growth. At the grid scale, the relationship between these three urbanization and vegetation growth remains unchanged; but there were significant differences in the thresholds of nonlinear relationship and the slope of linear relationship. This study can provide scientific reference for implementing more precise ecological management measures and achieving sustainable socio-economic development in this region.

导出引用

曾兴兰, 陈田田. 西南地区植被动态变化的驱动力解析[J]. 中国环境科学. 2023, 43(12): 6561-6570

ZENG Xing-lan, CHEN Tian-tian. Analysis of the driving forces of vegetation dynamic changes in southwest China[J]. China Environmental Science. 2023, 43(12): 6561-6570

中图分类号： X173 Q948

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