青藏高原草地植物多样性沿降水梯度的分布格局及影响因素
Distribution patterns and driving factors of grassland plant diversity along a precipitation gradient on the Qinghai-Tibet Plateau
张小燕 1冯明 1刘倩光 1杨国姣 1胡中民1
作者信息
- 1. 海南大学生态与环境学院,海口 570228
- 折叠
摘要
青藏高原不同尺度的植物多样性具有不同的空间分布格局,而形成这种格局的影响因素尚不清楚.本研究对青藏高原不同地区的33个样点进行植被群落和土壤调查,从α多样性、β多样性和γ多样性3个尺度阐明了植物物种多样性沿降水梯度的分布格局,采用线性回归和结构方程模型(SEM)探讨影响植物多样性分布格局的直接或间接因素.结果表明:青藏高原植物α和γ多样性随着降水量增加而增加,植物β多样性随着降水量增加而减少;降水量增加通过改变土壤湿度直接增加了植物α多样性,通过增加土壤无机氮含量间接增加植物α多样性;并且,降水量增加会通过增加土壤氮磷比和降低土壤pH值间接增加植物γ多样性.综上所述,随着降水量的变化,土壤理化性质会发生相应的变化,进而影响不同空间尺度的植物多样性.
Abstract
The distribution patterns of plant diversity in the Qinghai-Tibet Plateau vary across spatial scales.How-ever,the factors that drive these patterns are still unclear.We investigated plant community and soils in 33 grass-land sites along a precipitation gradient from Qinghai-Tibet Plateau,and elucidated the patterns of plant species di-versity from three aspects:α,β,and γ diversity.Linear regression and structural equation modeling(SEM)were used to explore the direct or indirect factors affecting the distribution patterns of plant diversity.We found that α di-versity and γ diversity increased,while β diversity decreased with increasing precipitation.Increased precipitation enhanced α diversity directly by changing soil moisture and indirectly by increasing soil inorganic nitrogen content.Moreover,increased precipitation indirectly increased γ diversity by increasing soil N/P ratio and decreasing soil pH.In summary,changes of precipitation can alter soil physicochemical properties,and thus affect plant diversity at different spatial scales.
关键词
降水格局/环境因子/植物多样性/土壤理化参数/空间尺度/青藏高原Key words
precipitation pattern/environmental factor/plant diversity/soil physicochemical property/spatial scale/Qinghai-Tibet Plateau引用本文复制引用
基金项目
海南大学科研启动经费项目(KYQDZR-22082)
青藏高原综合科学考察研究任务项目(第二次)()
青藏高原碳汇关键区调查项目(2019QZKK0405)
出版年
2024
国家科技期刊平台
NSTL
万方数据