伊洛河流域植被净初级生产力时空变化及影响因素分析
Temporal and Spatial Changes and the Driving Factors of Vegetation NPP in the Yiluo River Basin
李影 1赵辉 1周超 1张红娟2
作者信息
- 1. 河南省资源环境调查一院
- 2. 河南大学黄河文明与可持续发展研究中心
- 折叠
摘要
伊洛河流域是黄河流域的重要子流域,研究其植被净初级生产力(Net Primary Productivity,NPP)的时空变化对维持区域生态可持续发展具有重要意义.为揭示伊洛河流域植被NPP的时空演变规律及驱动机制,基于改进的CASA模型,综合气象、土地利用数据等多源数据,利用趋势分析、相关分析等方法探讨伊洛河流域2000-2020年植被NPP时空变化及驱动因素.结果表明:(1)2000-2020年伊洛河流域NPP年均值在357.64～669.74 gC/(m2·a),NPP高值区位于流域上游海拔与植被覆盖度较高区域,整体上呈现由西向东递减的趋势;(2)2000-2020年,流域NPP整体呈上升趋势,NPP增加区占总面积的88.96％;(3)NPP与年均气温呈正相关的区域占比为69.73％,与年均降水量呈正相关的区域占比高达95.22％;(4)2000-2020年流域NPP增加了 2.89 TgC,主要是由草地及其他类型等向林地、耕地的转换引起.本研究可为伊洛河流域植被恢复和生态保护提供科学支撑,为生态系统管理部门科学合理地决策土地利用提供参考依据.
Abstract
The Yiluo River Basin,a crucial sub-basin of the Yellow River Basin,holds significant importance for the study of temporal and spatial variations in the net primary productivity(NPP)of vegetation,pivotal for maintaining the sustainable ecological development of the region.This research aims to elucidate the spatio—temporal evolutionary trends and driving mechanisms of vegetation NPP in the Yiluo River Basin.Utilizing the refined CASA model and integrating multi-source data,including meteorological and land use information,we conducted an in-depth analysis of the spatio-temporal dynamics and driving factors influencing vegetation NPP from 2000 to 2020.Methodologies employed include trend and correlation analyses.Key findings are as follows:(1)Between 2000 and 2020,the annual mean NPP in the Yiluo River Basin fluctuated from 357.64 to 669.74 gC/(m2·a).The higher NPP values predominantly concentrated in the basin's upper reaches,characterized by greater elevations and denser vegetation cover,exhibiting a general west-to—east declining trend.(2)The study period witnessed an overall ascending trajectory in NPP across the basin,with the area experiencing NPP augmentation constituting 88.96％of the total studied expanse.(3)A positive correlation between NPP and average annual temperature was observed in 69.73％of the area,while a similar positive relationship with annual precipitation was noted in 95.22％of the region.(4)Alterations in land use types have been identified as significant contributors to NPP variability.From 2000 to 2020,the Yiluo River Basin experienced a net increase of 2.89 TgC in NPP,primarily attributed to the transformation of grasslands and other land types into forested and cultivated lands.This comprehensive analysis underscores the dynamic nature of vegetation NPP in the Yiluo River Basin and its intricate relationship with climatic factors and land use changes,thereby providing valuable insights for regional vegetation restoration and ecological conservation,and provide reference basis for ecosystem management departments to formulate scientific and reasonable land use decisions.
关键词
CASA模型/植被净初级生产力/时空变化/驱动因素/伊洛河流域Key words
CASA model/net primary productivity/temporal and spatial changes/driving factors/the Yiluo River Basin引用本文复制引用
出版年
2024
NETL
NSTL
万方数据