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Water use efficiency of China's terrestrial ecosystems and responses to drought.

Liu Y, Xiao J, Ju W, Zhou Y, Wang S, Wu X - Sci Rep (2015)

Bottom Line: Droughts usually increased annual WUE in Northeast China and central Inner Mongolia but decreased annual WUE in central China. "Turning-points" were observed for southern China where moderate and extreme droughts reduced annual WUE and severe drought slightly increased annual WUE.The cumulative lagged effect of drought on monthly WUE varied by region.WUE is expected to continue to change under future climate change particularly as drought is projected to increase in both frequency and severity.

View Article: PubMed Central - PubMed

Affiliation: Jiangsu Key Laboratory of Agricultural Meteorology, School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing, 210044, China.

ABSTRACT
Water use efficiency (WUE) measures the trade-off between carbon gain and water loss of terrestrial ecosystems, and better understanding its dynamics and controlling factors is essential for predicting ecosystem responses to climate change. We assessed the magnitude, spatial patterns, and trends of WUE of China's terrestrial ecosystems and its responses to drought using a process-based ecosystem model. During the period from 2000 to 2011, the national average annual WUE (net primary productivity (NPP)/evapotranspiration (ET)) of China was 0.79 g C kg(-1) H2O. Annual WUE decreased in the southern regions because of the decrease in NPP and the increase in ET and increased in most northern regions mainly because of the increase in NPP. Droughts usually increased annual WUE in Northeast China and central Inner Mongolia but decreased annual WUE in central China. "Turning-points" were observed for southern China where moderate and extreme droughts reduced annual WUE and severe drought slightly increased annual WUE. The cumulative lagged effect of drought on monthly WUE varied by region. Our findings have implications for ecosystem management and climate policy making. WUE is expected to continue to change under future climate change particularly as drought is projected to increase in both frequency and severity.

No MeSH data available.


Trends of annual WUE (g C kg−1 H2O yr−1) for the terrestrial ecosystems across China during the period 2000-2011.This figure was produced using ArcGIS 10.0.
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f2: Trends of annual WUE (g C kg−1 H2O yr−1) for the terrestrial ecosystems across China during the period 2000-2011.This figure was produced using ArcGIS 10.0.

Mentions: Annual WUE exhibited increasing trends in northern parts of China and decreasing trends in southern counterparts (Fig. 2). Annual WUE increased at a rate of 0.005 g C kg−1 H2O yr−1 for most regions in the eastern part of North China and a rate of 0.01 g C kg−1 H2O yr−1 in the eastern part of Northeast China. In the southern part of Northeast China and adjacent areas of North and Northwest China, annual WUE increased at a slightly higher rate (0.03 g C kg−1 H2O yr−1). South China also showed an increasing trend of WUE with a rate of >0.02 g C kg−1 H2O yr−1 in its southern parts. In contrast, annual WUE showed decreasing trends in northeastern Inner Mongolia, northern parts of Northeast, Tibetan Plateau, Southwest, Southeast and Central China. Southeastern Tibetan Plateau and central and southern East China exhibited decreasing trends of annual WUE (0.02 g C kg−1 H2O yr−1).


Water use efficiency of China's terrestrial ecosystems and responses to drought.

Liu Y, Xiao J, Ju W, Zhou Y, Wang S, Wu X - Sci Rep (2015)

Trends of annual WUE (g C kg−1 H2O yr−1) for the terrestrial ecosystems across China during the period 2000-2011.This figure was produced using ArcGIS 10.0.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4562296&req=5

f2: Trends of annual WUE (g C kg−1 H2O yr−1) for the terrestrial ecosystems across China during the period 2000-2011.This figure was produced using ArcGIS 10.0.
Mentions: Annual WUE exhibited increasing trends in northern parts of China and decreasing trends in southern counterparts (Fig. 2). Annual WUE increased at a rate of 0.005 g C kg−1 H2O yr−1 for most regions in the eastern part of North China and a rate of 0.01 g C kg−1 H2O yr−1 in the eastern part of Northeast China. In the southern part of Northeast China and adjacent areas of North and Northwest China, annual WUE increased at a slightly higher rate (0.03 g C kg−1 H2O yr−1). South China also showed an increasing trend of WUE with a rate of >0.02 g C kg−1 H2O yr−1 in its southern parts. In contrast, annual WUE showed decreasing trends in northeastern Inner Mongolia, northern parts of Northeast, Tibetan Plateau, Southwest, Southeast and Central China. Southeastern Tibetan Plateau and central and southern East China exhibited decreasing trends of annual WUE (0.02 g C kg−1 H2O yr−1).

Bottom Line: Droughts usually increased annual WUE in Northeast China and central Inner Mongolia but decreased annual WUE in central China. "Turning-points" were observed for southern China where moderate and extreme droughts reduced annual WUE and severe drought slightly increased annual WUE.The cumulative lagged effect of drought on monthly WUE varied by region.WUE is expected to continue to change under future climate change particularly as drought is projected to increase in both frequency and severity.

View Article: PubMed Central - PubMed

Affiliation: Jiangsu Key Laboratory of Agricultural Meteorology, School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing, 210044, China.

ABSTRACT
Water use efficiency (WUE) measures the trade-off between carbon gain and water loss of terrestrial ecosystems, and better understanding its dynamics and controlling factors is essential for predicting ecosystem responses to climate change. We assessed the magnitude, spatial patterns, and trends of WUE of China's terrestrial ecosystems and its responses to drought using a process-based ecosystem model. During the period from 2000 to 2011, the national average annual WUE (net primary productivity (NPP)/evapotranspiration (ET)) of China was 0.79 g C kg(-1) H2O. Annual WUE decreased in the southern regions because of the decrease in NPP and the increase in ET and increased in most northern regions mainly because of the increase in NPP. Droughts usually increased annual WUE in Northeast China and central Inner Mongolia but decreased annual WUE in central China. "Turning-points" were observed for southern China where moderate and extreme droughts reduced annual WUE and severe drought slightly increased annual WUE. The cumulative lagged effect of drought on monthly WUE varied by region. Our findings have implications for ecosystem management and climate policy making. WUE is expected to continue to change under future climate change particularly as drought is projected to increase in both frequency and severity.

No MeSH data available.