石羊河中游生长季植被覆盖对气候的响应

doi:10.13866/j.azr.2018.03.20

Abstract

Abstract: In this paper,the MODIS-EVI monthly data were used to calculate the values of vegetation coverage in the middle reaches of the Shiyang River in growing season during the period from 2006 to 2015. The interannual variation of vegetation coverage and its response to climate factors were investigated.The dimidiate pixel model (DPM) was used to calculate the values of vegetation coverage,and the interannual variation of vegetation coverage at different levels in the study area was extracted.The results showed that the low vegetation coverage was mainly distributed in the middle reaches in the 10 years,which was closely related to the interannual variation of precipitation in the same period.Secondly,the trend analysis was used to calculate the dynamic changes of vegetation coverage during the monitoring period.The results showed that the vegetation coverage in the middle reaches was increased,and its increase rate was 0.041·(10a)^-1.Significant increase of vegetation coverage occurred in the oasis-desert ecotone.Finally,the correlations between vegetation coverage and temperature and precipitation in growing season were analyzed by correlation analysis.The results showed that the correlation between vegetation coverage and precipitation in growing season was higher than that between vegetation coverage and temperature,and the average partial correlation coefficients were 0.14 and -0.05 respectively.The desert-oasis ecotone was significantly correlated with climatic factors.

Key words: growing season, vegetation coverage, dynamic monitoring, correlation, climatic factor, middle reaches of the Shiyang River

ZHANG Yong, YANG Zi-hui, WANG Li, KANG Ying. Response of Vegetation Coverage to Climatic Factors in the Middle Reaches of the Shiyang River in Growing Season[J].Arid Zone Research, 2018, 35(3): 662-668.

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Response of Vegetation Coverage to Climatic Factors in the Middle Reaches of the Shiyang River in Growing Season

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