Evaluating the grassland net primary productivity of southern China from 2000 to 2011 using a new climate productivity model

文献类型： 外文期刊

第一作者： Sun Cheng-ming

作者： Sun Cheng-ming;Chen Chen;Gu Ting;Chen Wen;Zhong Xiao-chun

作者机构：

关键词： grassland NPP;estimation model;annual precipitation;mean annual temperature;southern China

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：2.848； 五年影响因子：2.979 ）

ISSN： 2095-3119

年卷期： 2016 年 15 卷 7 期

页码：

收录情况： SCI

摘要： Grassland is the important component of the terrestrial ecosystems. Estimating net primary productivity (NPP) of grassland ecosystem has been a central focus in global climate change researches. To simulate the grassland NPP in southern China, we built a new climate productivity model, and validated the model with the measured data from different years in the past. The results showed that there was a logarithmic correlation between the grassland NPP and the mean annual temperature, and there was a linear positive correlation between the grassland NPP and the annual precipitation in southern China. All these results reached a very significant level (P<0.01). There was a good correlation between the simulated and the measured NPP, with R-2 of 0.8027, reaching the very significant level. Meanwhile, both root mean square errors (RMSE) and relative root-mean-square errors (RRMSE) stayed at a relatively low level, 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 from south to north, and the mean NPP was 471.62 g C m(-2) from 2000 to 2011. Additionally, there was a rising trend year by year for the mean annual NPP of southern grassland and the tilt rate of the mean annual NPP was 3.49 g C m(-2) yr(-1) in recent 12 years. The above results provided a new method for grassland NPP estimation in southern China.

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