首页|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

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

扫码查看
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。
Distribution patterns and driving factors of grassland plant diversity along a precipitation gradient on the Qinghai-Tibet Plateau
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.

precipitation patternenvironmental factorplant diversitysoil physicochemical propertyspatial scaleQinghai-Tibet Plateau

张小燕、冯明、刘倩光、杨国姣、胡中民

展开 >

海南大学生态与环境学院,海口 570228

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

海南大学科研启动经费项目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

KYQDZR-220822019QZKK0405

2024

生态学杂志
中国生态学学会

生态学杂志

CSTPCD北大核心
影响因子:1.439
ISSN:1000-4890
年,卷(期):2024.43(6)
  • 48