文献类型：期刊文献

中文题名：灌丛化草原物种多样性与生产力的权衡关系

英文题名：Trade-offs between productivity and biodiversity in a shrub-encroached grassland

作者：刘艳书[1,2] 李丹[2] 高岩[1]

第一作者：刘艳书

机构：[1]自然资源部国土整治中心土地整治重点实验室,北京100035;[2]中国林业科学研究院荒漠化研究所,北京100091

年份：2022

卷号：47

期号：8

起止页码：52-58

中文期刊名：测绘科学

外文期刊名：Science of Surveying and Mapping

收录：CSTPCD;;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：国家自然科学基金项目(31200350);国家重点研发计划项目(2016YFC0500804)

语种：中文

中文关键词：草原灌丛化;温带草原;内蒙古;草地生产力;多样性指数

外文关键词：shrub encroached grassland;temperate steppe;Inner Mongolia;grass productivity;biodiversity index

分类号：S812

摘要：针对全球变化背景下内蒙古典型草原小叶锦鸡儿灌丛密度增加对生态系统主要服务功能影响尚不清晰的问题,该文采用野外调查为主的方法,研究小叶锦鸡儿灌丛化对内蒙古典型草原物种多样性和草地生产力的影响,探讨灌丛化过程中二者间是否存在权衡关系。结果表明:随着灌丛高度、盖度、密度和生物量的增加,草地生产力显著增加,从8.55 g/m^(2)增加到21.76 g/m^(2);草本群落的物种多样性指数显著降低,物种丰富度从22种/m^(2)降到12种/m^(2);草地生产力与物种多样性间存在明显权衡关系。结构方程模型证明灌丛化对物种多样性和草地生产力都是直接影响,不存在通过影响土壤养分而间接影响物种多样性或草地生产力。本研究结果为灌丛草原利用与管理提供重要理论依据。
Due to the impact of climate changes and human activities,shrubs have encroached in worldwide temperate grasslands and savanna.However,it’s still unclear that the impact of encroached shrubs on the grass productivity and species diversity of typical steppe in Inner Mongolia.Field investigation and sampling were used to analyse the impact of shrub traits on steppe ecosystem functions and their relationships.The results showed that with the increase of shrub height,cover,density and biomass,the grassland biomass increased significantly,from 8.55 g/m^(2)to 21.76 g/m^(2);but biodiversity indices decreased significantly,and the species richness decreased from 22 to 11 species per square meter.Structural equation model further proved that shrub traits only had direct impacts on steppe productivity and biodiversity,and there was no indirect impact on those through affecting soil nutrients.The results of this study provided an important theoretical basis for the management of shrub encroached grassland.