Limits...
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.


Spatial distribution of mean annual WUE (g C kg−1 H2O) over the period 2000-2011 across China.This figure was produced using ArcGIS 10.0.
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f1: Spatial distribution of mean annual WUE (g C kg−1 H2O) over the period 2000-2011 across China.This figure was produced using ArcGIS 10.0.

Mentions: The mean annual WUE of China’s terrestrial ecosystems over the period 2000-2011 showed large spatial variability owing to the influences of climate, soils, and vegetation types exhibiting large gradients across the country (Fig. 1). Deciduous forests in northeastern China had the highest annual WUE (>1.4 g C kg−1 H2O). The crop producing regions such as the Huaibei Plains, Huabei Plains, and the upper reaches of the Yangtze River also had high WUE (above 1.0 g C kg−1 H2O). Southeast China, Central China, South China, and the east of Southwest China had intermediate annual WUE ranging from 0.5 to 0.8 g C kg−1 H2O. These regions are characterized by suitable temperature and abundant precipitation and therefore have relatively high net primary productivity (NPP) and evapotranspiration (ET). The vast Tibetan Plateau, Northwest China, and the grasslands of Inner Mongolia had the lowest annual WUE (<0.4 g C kg−1 H2O) because of the low productivity and high ratio of evaporation to ET associated with sparse vegetation and low temperature.


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)

Spatial distribution of mean annual WUE (g C kg−1 H2O) over the period 2000-2011 across China.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

f1: Spatial distribution of mean annual WUE (g C kg−1 H2O) over the period 2000-2011 across China.This figure was produced using ArcGIS 10.0.
Mentions: The mean annual WUE of China’s terrestrial ecosystems over the period 2000-2011 showed large spatial variability owing to the influences of climate, soils, and vegetation types exhibiting large gradients across the country (Fig. 1). Deciduous forests in northeastern China had the highest annual WUE (>1.4 g C kg−1 H2O). The crop producing regions such as the Huaibei Plains, Huabei Plains, and the upper reaches of the Yangtze River also had high WUE (above 1.0 g C kg−1 H2O). Southeast China, Central China, South China, and the east of Southwest China had intermediate annual WUE ranging from 0.5 to 0.8 g C kg−1 H2O. These regions are characterized by suitable temperature and abundant precipitation and therefore have relatively high net primary productivity (NPP) and evapotranspiration (ET). The vast Tibetan Plateau, Northwest China, and the grasslands of Inner Mongolia had the lowest annual WUE (<0.4 g C kg−1 H2O) because of the low productivity and high ratio of evaporation to ET associated with sparse vegetation and low temperature.

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.