陕甘宁三省区植被NPP时空变化及影响因素  

Spatiotemporal Variations of NPP and Influencing Factors in Shaanxi,Gansu and Ningxia Regions

作　　者：周璐红[1,2] 张康 ZHOU Luhong;ZHANG Kang(College of Land Engineering,Chang'an University,Xi'an 710054,Shaanxi,China;Key Laboratory of Land Consolidation of Shaanxi Province,Xi'an 710054,Shaanxi,China)

机构地区：[1]长安大学土地工程学院,陕西西安710054 [2]陕西省土地整治重点实验室,陕西西安710054

出　　处：《西北林学院学报》2024年第6期177-186,196,共11页Journal of Northwest Forestry University

基　　金：陕西省土地整治重点实验室开放基金项目(2019-JC02);长安大学研究生教育教学改革资助项目(300103120050)。

摘　　要：对植被净初级生产力(NPP)时空变化及其驱动机制进行分析,可以在一定程度上反映生态恢复与管理工程的水平,具有十分重要的现实意义。本研究基于MOD17A3 NPP数据集以及同期气象、地形等数据,采用趋势分析、偏相关分析以及地理探测器等方法,对2001—2020年陕甘宁植被NPP时空变化及其影响因素进行研究。结果表明:1)陕甘宁植被NPP整体呈增长趋势,增速为4.51 g/(m^(2)·a),其中陕西增长最为显著,甘肃和宁夏变化较为相近,植被固碳能力均不断提升。植被NPP在空间上有明显的差异性,总体呈现东南高西北低的特点,其中陕西汉中、安康、商洛以及甘肃陇南等地区植被资源丰富,向西北逐渐过渡到草原和荒漠草原,植被NPP开始不断减弱。2)陕甘宁植被NPP受到自然因素和人类活动的综合影响,与降水的相关性强于气温,相对湿度、降水、风速是引起植被NPP变化的主要气候因子,近年来人类活动产生的改善作用也在不断增强。地理探测器分析结果显示,双因子交互作用的解释力显著大于单因子,表现为非线性增强或双因子增强。研究结果揭示了气候变化和人类活动对植被NPP的影响,可为陕甘宁植被恢复和高质量发展提供依据,从而因地制宜制定有效的生态保护和管理策略。The objective of this study was to analyze the spatial and temporal changes of net primary productivity(NPP)of vegetation and its driving mechanism that can reflect the level of ecological restoration and management projects to a certain extent,which is of great practical significance.Based on the MOD17A3 NPP dataset as well as the meteorological and topographic data during the same period,the spatial and temporal changes of vegetation NPP and influencing factors in Shaanxi,Gansu and Ningxia regions from 2001 to 2020 were investigated by trend analysis,bias correlation analysis and geodetector analysis.The results indicated that 1)the vegetation NPP in Shaanxi,Gansu and Ningxia provinces showed an overall increasing trend,with a growth rate of 4.51 g/(m^(2)·a),among which Shaanxi showed the most significant growth,while Gansu and Ningxia showed similar changes,and the carbon sequestration capacity of the vegetation was increasing.The spatial distribution of vegetation NPP varied significantly,generally showing the distribution characteristics of high in the southeast and low in the northwest,in which areas such as Hanzhong,Ankang,Shangluo in Shaanxi and Longnan in Gansu were rich in vegetation resources,and gradually transitioning to grassland and desert grassland in the northwest,and the vegetation NPP began to weaken continuously.2)The vegetation NPP in three regions was affected by natural factors and human activities,and the correlation with precipitation was stronger than that with air temperature.Relative humidity,precipitation,and wind speed were the main climatic factors causing the changes in the vegetation NPP,and in recent years,the improvement effect produced by human activities had also been increasing.The results of geodetector analysis showed that the explanatory power of the two-factor interaction was significantly larger than that of the single factor,indicating the nonlinear enhancement or two-factor enhancement.The study reveals the effects of climate change and human activities on vegetation

关 键 词：陕甘宁 植被NPP 时空变化 

分 类 号：Q948[生物学—植物学]