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

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Solid Earth, 8, 545-552, 2017
https://doi.org/10.5194/se-8-545-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
21 Apr 2017
Application of a new model using productivity coupled with hydrothermal factors (PCH) 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 model using productivity coupled with hydrothermal factors (PCH) 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 relative root mean square error (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−1 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 model using productivity coupled with hydrothermal factors (PCH) for evaluating net primary productivity of grassland in southern China, Solid Earth, 8, 545-552, https://doi.org/10.5194/se-8-545-2017, 2017.
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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−1.
To simulate grassland NPP in Southern China, a new model was built and validated based on data...
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