Journal
JOURNAL OF INTEGRATIVE AGRICULTURE
Volume 15, Issue 7, Pages 1638-1644Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S2095-3119(15)61253-9
Keywords
grassland NPP; estimation model; annual precipitation; mean annual temperature; southern China
Categories
Funding
- Priority Academic Program Development of Jiangsu Higher Education Institutions, China (PAPD)
- Science and Technology Innovation Project Fund of Chinese Academy of Agricultural Sciences
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available