Spatial-temporal Dynamics of Vegetation Coverage and Responding to Climate Change in Shiyang River Basin during 2000-2015

doi:10.7522/j.issn.1000-694X.2017.00061

Journal of Desert Research ›› 2018, Vol. 38 ›› Issue (5): 1108-1118.DOI: 10.7522/j.issn.1000-694X.2017.00061

Spatial-temporal Dynamics of Vegetation Coverage and Responding to Climate Change in Shiyang River Basin during 2000-2015

Li Lili¹, Wang Dawei², Han Tao²

1. College of Earth Environmental Sciences, Lanzhou University, Lanzhou 730000, China;
2. Northwest Regional Climate Center, Lanzhou 730020, China

Received:2017-03-17 Revised:2017-06-30 Online:2018-09-20 Published:2018-11-03

Abstract

Abstract: The sensitivity of vegetation coverage in inland river basin is an important index to predict the change of future biodiversity, as well as a significant feedback of vegetation to global warming. Based on mean temperature, precipitation, sunshine hours, relative humidity, surface temperature and evaporation data, we analysis the correlation between vegetation coverage inversion and climatic factors, discuss the process of climatic factors with the changes of vegetation coverage, and investigate the response of vegetation coverage to climate change in the process of global warming in different spatial and temporal scales. The results show that:(1) the average vegetation coverage was low in Shiyang River Basin,the vegetation coverage in upper reaches was better than in downstream, was 59.4% and 13.6% respectively. The improved vegetation area is far greater than the degraded one and the vegetation coverage in oasis area increased obviously from 2000 to 2015. The overall trend of vegetation restoration was good but the vegetation in high altitude district and the surrounding area of Minqin oasis were degraded with different degree. (2) During 2000-2015, the relation between vegetation and the climatic factors of Shiyang River Basin were not significant. The area with positive correlation with precipitation and the area with negative correlation with evaporation were both the largest. The correlation between vegetation growth and heat gradually weakened at the same time the correlation between vegetation growth and water gradually strengthened. (3) There was a significant linear correlation between spline function and climatic factors of Shiyang River Basin. There is a higher response to climate factors in water conservation and desert area, a lower response in oasis area. The ground temperature is the crucial factor, which would result in the spatial and temporal patterns of vegetation coverage.

Key words: vegetation coverage, climatic factor, correlation, constraints, Shiyang River

CLC Number:

Q948.1

Li Lili, Wang Dawei, Han Tao. Spatial-temporal Dynamics of Vegetation Coverage and Responding to Climate Change in Shiyang River Basin during 2000-2015[J]. Journal of Desert Research, 2018, 38(5): 1108-1118.

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Spatial-temporal Dynamics of Vegetation Coverage and Responding to Climate Change in Shiyang River Basin during 2000-2015

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