摘要
为研究汾河流域NPP时空变化及其主导因素,结合MODIS NPP、气候、地形等数据,采用Theil-Sen趋势分析、相关性分析、地理探测器等方法,对2001—2021年汾河流域及流域内矿区的NPP时空分异特征和驱动因子进行分析。结果表明:汾河流域NPP具有明显的空间异质性,流域东西两侧山区NPP均值较高,流域中部NPP均值较低,21 a间汾河流域NPP呈波动上升趋势,年际增加速率为7.44 gC/(m^(2)·a),流域内矿区NPP年际增加速率略高于整个流域,不同矿区NPP均值不同但均明显增加;整个流域NPP呈减少趋势的区域仅占0.91%,主要分布在城区周围和矿区中,且NPP变化的全局莫兰指数为0.792,NPP变化存在明显的空间自相关性,变化剧烈的区域主要分布在矿区;随着高程和坡度的增加,流域NPP均值呈增加趋势,年降雨与NPP的相关性高于要高于年均温,有95.16%的区域与年降雨呈正相关,77.86%的区域与年均温呈正相关;影响因素探测结果表明,土地利用变化是影响汾河流域NPP变化的主导因子,且双因子交互后的影响明显高于单因子,其中土地利用与高程交互后的影响力最高。
Vegetation NPP is an important parameter reflecting vegetation ecological quality and carbon cycle in the regional ecosystem.In order to study the spatiotemporal changes of NPP and its dominant factors in the Fenhe River Basin,this paper combined MODIS NPP,climate,terrain and other data,using Theil-Sen trend analysis,correlation Using sexual analysis,geographical detectors and other methods,the spatial and temporal differentiation characteristics and driving factors of NPP in the Fenhe River Basin and mining areas within the basin were analyzed from 2001 to 2021.The results show that NPP in the Fenhe River Basin has obvious spatial heterogeneity.The average NPP in the mountainous areas on the east and west sides of the basin is higher,and the average NPP in the middle of the basin is lower.The NPP in the Fenhe River Basin showed a fluctuating upward trend over the past 21 years,with an inter-annual increase rate is 7.44 gC/(m^(2)·a).The interannual increase rate of NPP in the mining areas within the basin is slightly higher than that of the entire basin.The average NPP values in different mining areas are different but all increase significantly.The area with a decreasing trend in NPP in the entire watershed only accounts for 0.91%,mainly distributed around urban areas and mining areas,and the global Moran index of NPP changes is 0.792.There is obvious spatial autocorrelation in NPP changes,and areas with drastic changes Mainly distributed in mining areas.With the increase of elevation and slope,the average NPP value of the watershed shows an increasing trend.The correlation between annual rainfall and NPP is higher than that of annual average temperature.95.16%of the areas are positively correlated with annual rainfall,and 77.86%of the areas are positively correlated with annual rainfall.The average annual temperature is positively correlated.The detection results of influencing factors show that land use change is the dominant factor affecting NPP changes in the Fenhe River Basin,and the impact after the interaction of two factors is significantly higher than that of a single factor,among which the interaction between land use and elevation has the highest influence.
作者
张宇飞
杨文府
张文凯
汪雯雯
任文颖
闫伟涛
ZHANG Yufei;YANG Wenfu;ZHANG Wenkai;WANG Wenwen;REN Wenying;YAN Weitao(Key Laboratory of Survey,Monitoring and Protection of Natural Resources in Mining Cities,Ministry of Natural Resources,Jinzhong,Shanxi 030600,China;Shanxi Provincial Key Laboratory of Geological Disaster Monitoring,Early Warning and Prevention,Coal Geological Geophysical Exploration Surveying&Mapping Institute of Shanxi Province,Jinzhong,Shanxi 030600,China;College of Resources and Environment,Lanzhou University,Lanzhou 730000,China;Beijing Institute of Water Conservancy Planning and Design,Beijing 100048,China;School of Surveying,Mapping and Land Information Engineering,Henan Polytechnic University,Jiaozuo,Henan 454000,China)
出处
《测绘科学》
CSCD
北大核心
2024年第5期30-43,共14页
Science of Surveying and Mapping
基金
国家自然科学基金项目(U22A20620)
山西省基础研究计划青年科学研究项目(202203021212513)
关键词
汾河流域
NPP
时空特征
MODIS数据
地理探测
Fenhe River Basin
NPP
Spatio-temporal characteristics
MODIS data
geographical detection
作者简介
张宇飞(1997—),男,河南洛阳人,助理工程师,硕士,主要研究方向为生态遥感。E-mail:zyf15513998878@163.com;通信作者:杨文府,正高级工程师,E-mail:wcyywf@163.com
