稀疏植被净初级生产力时空变化及气象因素关系分析

本文探讨了2001-2018年古尔班通古特沙漠植被NPP时空格局,基于改进的CASA模型,采用空间分析、相关性分析及地理探测器模型等方法,揭示了研究区NPP气候驱动因子及其影响。结果表明:①古尔班通古特沙漠近18年植被NPP变化总体呈现波动增加趋势,增速为0.56 gC· a^-1,NPP均值为46.90 gC· m^-2· a^-1;②2001-2018年,年均NPP整体呈西低东高、北低南高的空间分布格局,但从动态上而言,基本呈现沙漠腹地较稳定、四周较活跃的格局;③古尔班通古特沙漠植被NPP主要受降水因子的影响,与降水、气温因子均呈正相关关系,从各因子驱动力分析而言,降水因子(0.614 4)为限制荒漠植被生长的主导因素。

Analysis of spatiotemporal variation of sparse vegetation net primary productivity and meteorological factors

Based on the improved CASA model,this paper uses methods containing spatial analysis,correlation analysis,and geographical detector model to explore the spatiotemporal pattern of the vegetation net primary production (NPP) in the Gurbantunggut desert from 2001 to 2018,and reveals the climate forcing factors of NPP and their impacts in the study area.The results of this paper show that:①In the past 18 years,the change of vegetation NPP in the Gurbantunggut desert showes a fluctuating increasing trend,with the growth rate of 0.56 gC· a^-1,and the average NPP is 46.90 gC· m^-2· a^-1.②From 2001 to 2018,the average annual NPP showes a spatial distribution pattern of increasing from northwest to southeast,and it is stable in the hinterland of the desert and more active around.③NPP in the Gurbantunggut desert is mainly affected by precipitation and is positively correlated with precipitation and temperature.In terms of the forcing analysis of each factor,precipitation (0.614 4) is the dominant factor restricting the growth of desert vegetation.