摘要
为明晰高原鼢鼠(Eospalax baileyi)干扰对高寒草甸植物功能性状及功能多样性的影响,本研究选取青藏高原东缘高原鼢鼠栖息地,以鼠丘斑块空间格局指数代表其干扰强度,划分为轻度、中度、重度和极重度干扰4个水平,设置无鼠丘草地为对照,调查了植被群落物种多度、常见植物功能性状和土壤理化性质。利用单因素方差分析不同干扰强度下植物功能性状和功能多样性的差异,采用全子集回归和冗余分析方法分析环境因子对植物功能性状及功能多样性的影响。结果表明:(1)相比对照,所有高原鼢鼠干扰区植物叶绿素相对含量、叶片碳含量群落加权平均值显著增加(P<0.05),而植物株高、比叶面积和叶片氮含量显著下降(P<0.05);(2)高原鼢鼠干扰下植物功能丰富度显著增加(P<0.05),而功能分异和RaoQ指数相比对照显著下降(P<0.05);(3)不同干扰强度区之间,植物功能性状和功能多样性变化较小;(4)冗余分析和全子集回归分析表明,土壤水分和温度是影响高寒草甸植物功能多样性的主要环境因子,土壤环境因子对功能性状和功能多样性解释贡献分别达到41.6%和27.3%。本研究结果表明,高原鼢鼠干扰改变了土壤环境因子(温度和水分),进而影响到植物功能性状和功能多样性。
To clarify the effects of plateau zokor(Eospalax baileyi)disturbance on functional traits and functional diversity of plants in alpine meadows,we utilized the spatial pattern index of zokor mounds to quantify disturbance intensity.A section of plateau zokor habitat on the eastern edge of the Qinghai-Tibet Plateau was segmented into four disturbance levels of light,moderate,severe,and extremely severe disturbance,with plots devoid of zokor mounds being served as a control.We measured plant species richness,functional traits of common plants,and soil physicochemical characteristics in all the plots.One-way ANOVA was applied to assess the variations in functional traits and functional diversity across the disturbance gradient.Additionally,full subset regression and redundancy analysis were employed to determine the influence of environmental factors on plant functional traits and functional diversity.The results showed that:(1)compared to the control,under the disturbance of plateau zokor,the community weighted mean of relative chlorophyll content and leaf carbon content significantly increased(P<0.05),while plant height,specific leaf area,and leaf nitrogen content in the disturbed areas significantly decreased(P<0.05);(2)Under the disturbance of plateau zokor,plant functional richness significantly increased(P<0.05),whereas functional divergence and the RaoQ index significantly decreased(P<0.05);(3)The differences in functional traits and functional diversity were marginal across the various levels of zokor disturbance intensity.(4)Results of redundancy analysis and full subset regression analysis showed that soil moisture and temperature were the main factors affecting the functional diversity of alpine meadow plants,with soil environmental factors explaining 41.6%and 27.3%of the variance in functional traits and functional diversity,respectively.Our results suggested that plateau zokor disturbance changed soil environmental factors(temperature and moisture),which in turn affected plant functional traits and functional diversity.
作者
王磊
包达尔罕
董隆明
余涛
叶国辉
花立民
WANG Lei;BAO Daerhan;DONG Longming;YU Tao;YE Guohui;HUA Limin(College of Prataculture Science,Gansu Agricultural University,Key Laboratory of Grassland Ecosystem of the Ministry of Education,Engineering and Technology Research Center for Alpine Rodent Pest Control,National Forestry and Grassland Administration,Lanzhou 730070,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2024年第6期1629-1637,共9页
Chinese Journal of Ecology
基金
国家自然科学基金项目(32160338)
甘肃省教育厅产业支撑计划项目(2021CYZC-05)资助。
关键词
青藏高原
高寒草甸
高原鼢鼠
植物功能性状
功能多样性
Qinghai-Tibet Plateau
alpine meadow
plateau zokor
plant functional trait
functional diversity
