摘要
阐明北京市植被净初级生产力(Net Primary Production,NPP)的时空演变特征与驱动机制,评估其固碳释氧服务功能,可为区域植被恢复与生态环境优化提供科学依据。本文基于MODIS NPP时间序列遥感数据,利用Theil-Sen趋势分析、Mann-Kendall检验、变异系数、Hurst指数、地理探测器以及固碳释氧量模型,对2000—2023年北京市植被NPP的时空演变、稳定性、未来趋势、驱动因子以及固碳释氧能力进行了定量分析。结果表明,2000—2023年期间,北京市植被NPP年均值呈现波动上升趋势,年均增长率为7.72 g/(m^(2)·a),变化趋势以极显著增加为主(占比81.08%),空间上呈现“北高南低”的分布格局。然而,研究区NPP波动性较大,高波动区占比高达59.22%,主要集中于东南部平原和中心城区;Hurst指数分析显示,约75.53%的区域NPP呈反持续性特征,预示未来变化可能与当前趋势相反。在驱动机制上,土地利用类型、气温和辐射是NPP变化的主要影响因子,且土地利用类型与降水、高程及气温的交互作用显著。此外,区域固碳释氧量的空间分布与NPP高度一致,北部山区的生态功能显著优于南部市区,其中林地的固碳释氧能力最强,耕地、园地和草地次之。本研究成果可为北京市实现“双碳”战略目标、优化生态系统管理及促进区域可持续发展提供科学依据。
Elucidating the spatiotemporal evolution characteristics and driving mechanisms of vegetation net primary production(NPP)in Beijing,and evaluating its carbon sequestration and oxygen release services,can provide a scientific basis for regional vegetation restoration and ecological environment optimization.Based on MODIS NPP time-series remote sensing data,this study quantitatively analyzed the spatiotemporal evolution,stability,future trends,driving factors,and carbon sequestration and oxygen release capacity of vegetation NPP in Beijing from^(2)000 to 2023 by employing Theil-Sen trend analysis,the Mann-Kendall test,the coefficient of variation,the Hurst exponent,Geodetector,and carbon sequestration and oxygen release models.The results indicate that the annual mean NPP of vegetation in Beijing exhibited a fluctuating upward trend over the past 24 years,with an average annual growth rate of 7.72 g/(m^(2)·a).The trend was dominated by extremely significant increases(accounting for 81.08%),spatially presenting a pattern of"high in the north and low in the south".However,the volatility of NPP in the study area was relatively high,with high-fluctuation areas accounting for 59.22%,primarily concentrated in the southeastern plains and central urban areas;Hurst exponent analysis revealed that approximately 75.53%of the regional NPP showed anti-persistence,suggesting future changes might contradict current trends.In terms of driving mechanisms,land use type,temperature,and solar radiation were the main factors influencing NPP variations,and the interactions between land use type and precipitation,elevation,as well as temperature were significant.Furthermore,the spatial distribution of carbon sequestration and oxygen release was highly consistent with that of NPP;The ecological function of the northern mountainous areas was significantly superior to that of the southern urban areas,with forest land exhibiting the strongest capacity,followed by cultivated land,garden land,and grassland.This study provides a scientific basis for Beijing to achieve its"dual carbon"strategic goals,optimize ecosystem management,and promote regional sustainable development.
作者
王姗
张煜钦
颜芳
王胜涛
张世文
邓江波
李雪琳
王临晨
WANG Shan;ZHANG Yuqin;YAN Fang;WANG Shengtao;ZHANG Shiwen;DENG Jiangbo;LI Xuelin;WANG Linchen(School of Earth and Environment,Anhui University of Science and Technology,Huainan 232001,China;College of Chimesity Engineering,North China University of Science and Technology,Tangshan 063210,China;Beijing Cultivated Land Construction and Protection Center,Beijing 100020,China)
出处
《安徽科技学院学报》
2026年第1期45-57,共13页
Journal of Anhui Science and Technology University
基金
第三次新疆综合考察项目(2021xjkk0200601)
粮食作物创新团队土壤评价与质量提升岗位专家项目(BAIC02-2023)。
关键词
植被净初级生产力
时空动态特征
地理探测器
固碳释氧
net primary productivity(NPP)
spatiotemporal dynamics
geographic detector
carbon sequestration and oxygen release
