Publications

Zhao, YL; Liu, HX; Zhang, AB; Cui, XM; Zhao, AZ (2019). Spatiotemporal variations and its influencing factors of grassland net primary productivity in Inner Mongolia, China during the period 2000-2014. JOURNAL OF ARID ENVIRONMENTS, 165, 106-118.

Abstract
The quantification of changes in long-term trends in grassland net primary productivity (NPP) and its large-scale driving forces are important for understanding terrestrial ecosystem changes in arid and semi-arid regions. Based on the MODIS-NPP dataset, this study investigated patterns in the spatiotemporal variations in NPP and its possible influencing factors in Inner Mongolia during 2000-2014 using the linear trend analysis method, correlation analysis, and an F test. The results show that grassland NPP had an annual rate of increase of 4.53 g C/(m(2).a) with a significant increasing trend (p < 0.01). Spatial analysis results indicate that the average grassland NPP presented a gradual increasing trend from southwest to northeast, with an area of longitudinal zonality being identified. Grassland NPP presented a significant increase (p < 0.05) in more than 31.93% of the region. Grassland NPP and growing season precipitation (GSP) had a significant negative correlation in 54.78% of the study area. Grassland NPP and the growing season average land surface temperature (GSALST) had a significant negative correlation for 65.93% of the study area; growing season average temperature (GSAT) had no significant effect on the grassland NPP. For different grassland types, GSP had the greatest impact on alpine meadows (r = 0.73), and GSALST had the greatest impact on alpine steppes and alpine meadows (r = - 0.81). Related ecological restoration projects such as fenced rangeland and planted grass played a positive impact on annual NPP in the study area.

DOI:
10.1016/j.jaridenv.2019.01.004

ISSN:
0140-1963