福建省极端降水对植被净初级生产力的空间异质性影响分析

Effects of extreme precipitation on spatial heterogeneity of net primary production in Fujian Province

植被碳动态与极端降水变化具有较强的相互作用。探索表征碳动态的植被净初级生产力(NPP)指标对极端降水事件的响应变化,对研究区域生态系统适应气候变化的策略具有重要意义。本研究基于1985—2015年的净初级生产力数据,利用地理探测器探讨了极端降水因子对不同海拔高度的NPP的影响效应。结果表明:1)福建省NPP整体上呈增长趋势,其空间分布与海拔高度相关。2)从单因子效应看,最大1日降水量显著影响海拔200 m以下的NPP空间格局,降水强度显著影响海拔200 m以上的NPP空间格局。3)从因子交互效应看,降水强度与最大1日降水量的交互效应对NPP空间格局的驱动作用更为显著。研究从不同海拔高度深化了福建省极端降水对NPP的影响机制,为福建省植被生态的分区分类保护与修复提供了参考。

The interaction between vegetation carbon dynamics and extreme precipitation changes is significant.Exploring how vegetation net primary productivity(NPP)that characterizes carbon dynamics respond to extreme precipitation events is crucial for climate change adaptation strategy research of regional ecosystems.This study,based on NPP data from 1985 to 2015,utilized a Geo-detector to investigate the impact of extreme precipitation factors on vegetation NPP at different altitudes in Fujian Province.The results indicate that:1)NPP shows an overall increasing trend,with its spatial distribution correlated with altitude.2)From a single-factor perspective,the maximum one-day precipitation significantly influences the spatial pattern of NPP below 200 m in altitude,while precipitation intensity significantly affects the spatial pattern of vegetation NPP above 200 m in altitude.3)In terms of factor interaction effects,the interaction between precipitation intensity and maximum one-day precipitation has a more significant driving effect on the spatial pattern of NPP.This study deepens the understanding of the impact mechanisms of extreme precipitation on NPP in Fujian Province at different altitudes,providing insights for the classification,protection,and restoration of vegetation ecology in the region.