Characteristics of vegetation net primary productivity change and its climatic driving forces in the Yinshanbeilu Steppe,Inner Mongolia
[Objective]The spatiotemporal variation characteristics of net primary productivity(NPP)of vegetation in Yinshan-beilu steppe are studied,and the effects of climate and topographic factors on the changes in vegetation NPP are analysed,aiming to provide a theoretical basis for the ecological protection and sustainable development of steppe in Inner Mongolia.[Methods]Based on MODIS NPP,meteorological,and DEM,the change characteristics of vegetation NPP and its driving factors in Yinshanbeilu steppe were analysed and identified by using Theil-Sen Median trend analysis,M-K mutation analysis,geographical detector,and Pearson correlation analysis.[Results]From 2001 to 2022,there was an average annual increase of 2.784 gC m-2a-1 in the net primary productivity(NPP)of vegetation in Yinshanbeilu steppe,and the eastern and southern parts are increasing more rapid than other zone of the study area.Precipitation,sunshine duration,minimum temperature,maximum temperature and topographic are the driven forces to the changes in vegetation NPP.An increase in precipitation promoted in the growth of vegetation NPP,with a correlation coefficient of 0.639.The maximum and minimum temperatures were found to be slightly negatively correlated with vegetation NPP,with correlation coefficients of-0.162 and-0.051,respectively.[Conclusion]The net primary productivity(NPP)of vegetation in Yinshanbeilu steppe exhibited a significant overall increasing trend,topographic factors were found to exert a weak driving force on vegetation NPP,and the main driving factor is precipitati-on.The interaction between precipitation and sunshine duration,maximum temperature,and minimum temperature was found to affect the changes in vegetation NPP significantly.
万方数据
维普
