2001-2013年华北地区植被覆盖度与干旱条件的相关分析

doi:10.11821/dlxb201505004

Abstract

Abstract:

Based on previous studies, the climate drought index can be used to assess the evolution trend of ecological environment under various arid climatic conditions. It is necessary for us to further explore the relationship between vegetation coverage (index) and climate drought conditions. Therefore, in this study, based on MODIS-NDVI products and meteorological observation data, the Palmer Drought Severity Index (PDSI) and vegetation coverage in North China were first calculated. Then the interannual variation of PDSI and vegetation coverage over 2001-2013 was analyzed by using a Theil-Sen slope estimator. Finally in an ecoregion perspective the correlation between them was discussed. The experimental results demonstrated that PDSI index and vegetation coverage value varied over different ecoregions. During the period 2001-2013, vegetation coverage increased in southern and northern mountains in North China, while it showed a decreasing trend in Beijing-Tianjin-Tangshan City Circle area and suburban agricultural zone. During the 13 years, the climate of the northeastern part of North China became more humid, while in the southern part of North China, it tended to be dry. According to the correlation analysis results, 73.37% of North China had a positive correlation between the vegetation coverage and climate drought index. A negative correlation was observed mainly in urban and periurban areas of Beijing, Tianjin, Hebei Province and Henan Province. In most parts of North China, drought conditions in summer and autumn had more influence on vegetation coverage.

Key words: North China, vegetation coverage, PDSI, ecoregion, correlation analysis

ZHAO Shuyi, GONG Zhaoning, LIU Xuying. Correlation analysis between vegetation coverage and climate drought conditions in North China during 2001-2013[J].Acta Geographica Sinica, 2015, 70(5): 717-729.

Figures/Tables 10

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干旱指数值	等级	干旱指数值	等级
≥ 4.00	极端湿润	-1.99~-1.00	轻微干旱
3.00~3.99	严重湿润	-2.99~-2.00	中等
2.00~2.99	中等湿润	-3.99~-3.00	严重干旱
1.00~1.99	轻微湿润	≤-4.00	极端干旱
-0.99~0.99	正常

Correlation analysis between vegetation coverage and climate drought conditions in North China during 2001-2013

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