[1]CHANG Xiaoge,WANG Zhihui,XIAO Peiqing,et al.Spatial Variation Patterns of Dynamics of Water Use Efficiency of Ecosystem and Its Drivers on the Chinese Loess Plateau[J].Research of Soil and Water Conservation,2022,29(05):244-252.
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Spatial Variation Patterns of Dynamics of Water Use Efficiency of Ecosystem and Its Drivers on the Chinese Loess Plateau
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
29
Number of periods:
2022 05
Page number:
244-252
Column:
Public date:
2022-08-20
- Title:
- Spatial Variation Patterns of Dynamics of Water Use Efficiency of Ecosystem and Its Drivers on the Chinese Loess Plateau
- Keywords:
- water use efficiency; spatial variation pattern; Chinese Loess Plateau; partial correlation analysis; influential factors
- CLC:
- Q948
- DOI:
- -
- Abstract:
- Water Use Efficiency(WUE)is a key factor in the carbon-water coupling process. Study on the spatial and temporal variability of WUE on the China Loess Plateau(CLP)and its drivers can help explain the mechanisms of ecosystem response to climate and water resources changes, and also contributes to the management of water resources and the assessment of carbon budgets. Based on satellite remote sensing products, including Gross Primary Productivity(GPP), Evapotranspiration(ET), land cover and meteorological field observations, linear slope method was used to calculate the variation trend of WUE in different vegetation types from 2000 to 2018. Partial correlation coefficient method was employed to explore the variation characteristics of correlations between WUE and precipitation(P), temperature(Temp), vapor pressure difference(VPD), potential evapotranspiration(ET0)and leaf area index(LAI)with drought index, respectively changs. The results showed that:(1)the annual mean WUE was 1.24 gC/(m2·mm)in the CLP from 2000 to 2018, and the growth rate of inter-annual WUE was 0.02 gC/(m2·mm·a). Meanwhile, the area with significant increasing trend accounted for 47.36% of the CLP;(2)the annual mean WUE of all vegetation types on the CLP showed a significant decreasing trend with the increase of drought index, among which the decrease rate of WUE of grassland was the fastest with the increase of drought index. Although the variation rate of WUE was positive for all vegetation types, there were differences in the variation pattern of WUE growth rate with drought index for different vegetation types; the WUE growth rate of croplands which were significantly affected by human activities was less sensitive to the drought index, while the WUE growth rate of forest and grass vegetation showed a pattern that increased first and then decreased with the increase of drought index, and there was a threshold effect;(3)the LAI had the greatest effect on the change in WUE, with its change dominating 58.16% of the area, and the other drivers were Temp, ET0, VPD and P. Under the severe drought conditions, the WUE of all vegetation was negatively correlated with P; compared with cropland and forest, the correlation between WUE and Temp of shrub-grass vegetation was more sensitive to the drought index; in addition, there was a threshold effect in the correlation of WUE of shrub-grass vegetation with VPD and ET0 with the increase of drought index.
- References:
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Last Update:
2022-08-20