少花蒺藜草植物功能性状对降雨量变化和遮光的响应

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中图分类号：Q948 文献标识码：A 文章编号：1007-0435（2026）01-0052-09

Abstract： Under the context of global change，plant invasion events have become more frequent and widespread.Rainfall and light are important ecological factors that afect the adaptation and dispersal of invasive plants.Cenchrus spinifex，a major invasive plant in the Horqin Sandy Land China，has expanded its invasion area in recent years，posing significant threats to local biodiversity and ecosystem functions.Understanding its invasionand adaptation mechanisms is crucial fordevising efective control strategies.In this study，we established an in situ field experiment by using pipe cultivation to explore the functional traits of Cenchrus spinifex under three treatments：increased rainfall，reduced rainfall，shading，and a control（CK） group. The results revealed that both increased rainfall and reducedrainfall significantly enhanced plant heigh. increased rainfall increased branching，the numberof reproductive branches，spiny burs，leaf biomass，and leaf contribution ratio significantly.Reduced rainfallpromoted tiller number，total root length，root contribution ratio，and spiny bur contribution ratio significantly. In contrast，shading significantly reduced crown width，spiny bur number，total root length，and biomassof all organs.These findings indicate that Cenchrus spinifex adapts to variations in rainfall and light availability by modulating plant architecture，biomassof organ and biomass allcation.This study provides a theoretical basis for revealing the invasion andadaptation mechanisms of Cenchrus spinifex under the background of climate change，and to provide reference for predicting its suitable or spreading areas.

Key words：Cenchrus spinifex;Rainfall;Shading;Plant type characteristics;Biomass

外来生物入侵影响自然生态系统结构[1-2]，是导致生物多样性丧失的重要原因之一[3]。（剩余16943字）