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Solid Earth An interactive open-access journal of the European Geosciences Union

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doi:10.5194/se-2016-148
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
08 Nov 2016
Review status
A revision of this discussion paper is under review for the journal Solid Earth (SE).
Application of a new productivity coupling hydrothermal factors (PCH) model for evaluating net primary productivity of grassland in Southern China
Zheng-Guo Sun1, Jie Liu2, and Hai-Yang Tang1 1College of Agro-grassland Science, Nanjing Agricultural University, 1 Weigang, Nanjing, Jiangsu 210095, People's Republic of China
2Department of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan
Abstract. Grassland ecosystems play important roles in the global carbon cycle. The net primary productivity (NPP) of grassland ecosystems has become the hot spot of terrestrial ecosystems. To simulate grassland NPP in Southern China, a new productivity coupling hydrothermal factors (PCH) model was built and validated based on data recorded from 2003 to 2014. The results show a logarithmic correlation between grassland NPP and mean annual temperature and a linear positive correlation between grassland NPP and mean annual precipitation in Southern China, both highly significant relationships. There was a highly significant correlation between simulated and measured NPP (R2 = 0.8027). Both RMSE and RRMSE were relatively low, showing that the simulation results of the model were reliable. The NPP values in the study area had a decreasing trend from east to west and south to north. Mean NPP was 471.62 g C m−2 from 2003 to 2014. Additionally, the mean annual NPP of Southern grassland presented a rising trend increasing 3.49 g C m−2 yr−2 during the past 12 years. These results document performance and use of a new method to estimate the grassland NPP in Southern China.

Citation: Sun, Z.-G., Liu, J., and Tang, H.-Y.: Application of a new productivity coupling hydrothermal factors (PCH) model for evaluating net primary productivity of grassland in Southern China, Solid Earth Discuss., doi:10.5194/se-2016-148, in review, 2016.
Zheng-Guo Sun et al.
Zheng-Guo Sun et al.
Zheng-Guo Sun et al.

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Short summary
To simulate grassland NPP in Southern China, a new model was built and validated based on data recorded from 2003 to 2014. There was a highly significant correlation between simulated and measured NPP. The NPP values had a decreasing trend from east to west and south to north. Mean NPP was 471.62 g C m−2 from 2003 to 2014. Additionally, the mean annual NPP presented a rising trend increasing 3.49 g C m−2 yr−2.
To simulate grassland NPP in Southern China, a new model was built and validated based on data...
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