水土保持学报2024，Vol.38Issue(3)：335-344,10.DOI:10.13870/j.cnki.stbcxb.2024.03.016
西南地区植被NPP对多尺度气象干旱的响应
Response of Vegetation NPP to Multiscale Meteorological Drought in Southwest China
摘要
Abstract
[Objective]This study was aimed to explore the response mechanism of vegetation to drought at different times scales and clarify the frequent occurrence of extreme drought events in southwest China on vegetation growth.[Methods]Based on vegetation net primary productivity(NPP)data from 2001 to 2019 and standardized precipitation evapotranspiration index(SPEI)data on a continuous scale from 1-24 months in southwest China,correlation analysis,maximum synthesis method,significance test were used to analyze the responses of NPP of different geomorphic types and vegetation types to multi-scale SPEI in southwest China.[Results](1)On the annual scale,seasonal scale and growing season,the responses of vegetation NPP and SPEI at 1-24 months were dominated by the January-March scale,vegetation NPP had a good response to short-term drought changes,but a relatively poor response to medium and long-term drought changes.(2)The response of NPP to SPEI at 1-24 month scale showed significant spatial heterogeneity and seasonal differences.The interannual correlation showed a trend of significant positive correlation to significant negative correlation from southeast to northwest.The seasonal correlation showed that significant negative correlation was dominant in summer,significant positive correlation was dominant in spring,autumn,and winter.This indicated that in the southwest China,the summer temperature was high and humid,which limited vegetation growth the area with the largest positive correlation was Guangxi Hills,while the area with the largest negative correlation was Zoige Plateau.(3)The responses of NPP to SPEI from 1-24 months were different among different vegetation types.Although the response characteristics of grassland,scrub and forest land to SPEI were basically similar,the trend of negative correlation between NPP and SPEI became stronger with the scales of SPEI decreased in summer for all types of vegetation.This suggested that all types of vegetation are more susceptible to drought under high temperature and drought conditions in summer.[Conclusion]The research results provide effective scientific support for the protection and restoration of the ecosystem in the southwest China,provide an important theoretical basis for disaster prevention and reduction and coping with climate change,help formulate more targeted policies and measures to promote the sustainable development of southwest China.关键词
西南地区/NPP/SPEI/气象干旱/干旱响应/相关分析Key words
southwest region/NPP/SPEI/meteorological drought/drought response/correlation analysis分类
农业科技引用本文复制引用
靖娟利,孙佳荟,赵婷,付宝苇..西南地区植被NPP对多尺度气象干旱的响应[J].水土保持学报,2024,38(3):335-344,10.基金项目
国家自然科学基金项目(42161028) （42161028）
