DOI: 10.5194/hess-19-3387-2015
Scopus记录号: 2-s2.0-84938633163
论文题名: Relating seasonal dynamics of enhanced vegetation index to the recycling of water in two endorheic river basins in north-west China
作者: Matin M ; A ; , Bourque C ; P ; -A
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2015
卷: 19, 期: 8 起始页码: 3387
结束页码: 3403
语种: 英语
Scopus关键词: Biology
; Dynamics
; Landforms
; Precipitation (meteorology)
; Rain
; Recycling
; Rivers
; Snow melting systems
; Vegetation
; Water resources
; Watersheds
; Enhanced vegetation index
; Growing season
; Land-cover types
; Qilian mountains
; Seasonal dynamics
; Temporal variation
; Vegetation coverage
; Vegetation phenology
; Water recycling
; correlation
; evaporation
; global warming
; growing season
; land cover
; meltwater
; mountain environment
; oasis
; phenology
; precipitation (climatology)
; precipitation assessment
; rainfall
; recycling
; river basin
; seasonal variation
; snowmelt
; temporal variation
; vegetation cover
; vegetation index
; vegetation structure
; water vapor
; China
; Gansu
; Qilian Mountains
英文摘要: This study associates the dynamics of enhanced vegetation index in lowland desert oases to the recycling of water in two endorheic (hydrologically closed) river basins in Gansu Province, north-west China, along a gradient of elevation zones and land cover types. Each river basin was subdivided into four elevation zones representative of (i) oasis plains and foothills, and (ii) low-, (iii) mid-, and (iv) high-mountain elevations. Comparison of monthly vegetation phenology with precipitation and snowmelt dynamics within the same basins over a 10-year period (2000-2009) suggested that the onset of the precipitation season (cumulative % precipitation > 7-8 %) in the mountains, typically in late April to early May, was triggered by the greening of vegetation and increased production of water vapour at the base of the mountains. Seasonal evolution of in-mountain precipitation correlated fairly well with the temporal variation in oasis-vegetation coverage and phenology characterised by monthly enhanced vegetation index, yielding coefficients of determination of 0.65 and 0.85 for the two basins. Convergent cross-mapping of related time series indicated bi-directional causality (feedback) between the two variables. Comparisons between same-zone monthly precipitation amounts and enhanced vegetation index provided weaker correlations. Start of the growing season in the oases was shown to coincide with favourable spring warming and discharge of meltwater from low- to mid-elevations of the Qilian Mountains (zones 1 and 2) in mid-to-late March. In terms of plant requirement for water, mid-seasonal development of oasis vegetation was seen to be controlled to a greater extent by the production of rain in the mountains. Comparison of water volumes associated with in-basin production of rainfall and snowmelt with that associated with evaporation seemed to suggest that about 90 % of the available liquid water (i.e. mostly in the form of direct rainfall and snowmelt in the mountains) was recycled locally. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78456
Appears in Collections: 气候变化事实与影响
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作者单位: Faculty of Forestry and Environmental Management, University of New Brunswick, New-Brunswick, Canada; School of Soil and Water Conservation, Beijing Forestry University, Beijing, China
Recommended Citation:
Matin M,A,, Bourque C,et al. Relating seasonal dynamics of enhanced vegetation index to the recycling of water in two endorheic river basins in north-west China[J]. Hydrology and Earth System Sciences,2015-01-01,19(8)