降水变化对草原灌丛化的影响研究进展  

The effects of precipitation changes on the shrub encroachment in grassland

作　　者：卫洁 陈清[1] WEI Jie;CHEN Qing(Tianjin Key Laboratory of Water Resources and Environment,Tianjin Normal University,Tianjin 300387,China;Faculty of Geography,Tianjin Normal University,Tianjin 300387,China)

机构地区：[1]天津师范大学天津市水资源与水环境重点实验室,天津300387 [2]天津师范大学地理学部,天津300387

出　　处：《生态科学》2025年第1期269-277,共9页Ecological Science

基　　金：国家自然科学基金项目(31971437)。

摘　　要：草原具有重要的经济和生态系统服务功能,但近年来,由于气候变化(干旱和极端降水事件频发)和人类对草地的过度利用,草原植被退化和灌丛化严重。降水是影响草地植物生长和群落结构的首要限制因子,降水变化对草原灌丛化影响的研究有重要的意义。文章主要总结了国内外不同草原生态系统草本-灌木对水分的利用策略,降水量、降水频率和降水强度等降水变化对草原灌丛化的影响,深入理解降水变化对于草本-灌木竞争的影响机制。研究发现生长季降水量和降水频率减少、高强度降水能够降低草原草本植物生物量和相对丰度,促进灌木扩张,非生长季降水对草原灌丛化影响的研究仍然欠缺。降水变化是草原灌丛化的一个重要原因,可作为灌木入侵的一个预测因子。The grassland plays an important role in economic and ecosystem service,but in recent years,due to climate changes(frequent drought and extreme precipitation events)and human over utilization,plant community degradation and shrub encroachment have become seriously in grassland.Precipitation is the first limiting factor for plant growth and community structure in grassland,and it has important implications to study the influence of precipitation changes on shrub encroachment in grassland.This paper mainly summarized the water utilization strategies of grasses and shrubs growth in different grassland ecosystems worldwide,the effects of precipitation changes(precipitation,precipitation frequency and precipitation intensity)on shrub encroachment in grassland,and further deeply understood the influence mechanism of precipitation changes on the grasses and shrubs competition.The study found that the reduction of growing season precipitation and precipitation frequency,and high precipitation intensity could reduce the biomass and relative abundance of grasses and promote the shrubs expansion.There is still a lack of research on the influence of non-growing season precipitation on grassland shrub expansion.Precipitation changes are important reasons for shrub encroachment in grassland,which can be used as a predictor of shrub invasion.

关 键 词：降水量 降水强度 降水频率 灌丛化 

分 类 号：Q948.1[生物学—植物学] S812.6[农业科学—草业科学]