摘要
明确植物功能多样性与生态系统多功能性(EMF)之间的关系,可以更清晰地阐释生态系统功能的变化。以往生物多样性-生态系统功能关系的研究仅停留在对单一生态系统功能(SEF)的实验性或观察性调查,忽略了生态系统能同时提供多种功能和服务这一最本质的重要价值。该研究以巴音布鲁克高寒草甸为研究区,在海拔2194-3062m范围内以200 m左右为间隔设置了5个海拔高度,选取土壤全氮含量、硝态氮含量、铵态氮含量、全磷含量、速效磷含量、全钾含量、速效钾含量、土壤密度、植物群落地上与地下生物量10个与养分循环、土壤有机碳蓄积和植物生长有密切联系的指标,综合各指标平均值来表征EMF。结果表明:(1)群落物种组成沿海拔梯度变化较大,海拔2600 m处物种丰富度显著高于其他海拔;功能均匀度指数(FEve)、功能丰富度指数(FRic)和功能分散度指数(FDis)均随着海拔的升高呈现“单峰”变化趋势,最高值分别出现在2600、2800、2800m处;Rao二次熵指数(Rao’Q)整体呈现单调递减趋势。(2)各海拔高度上FRic、FDis与EMF间均存在极显著的正相关关系,分别解释了EMF 47%和43%的变化;在海拔2600 m处FEve与土壤养分循环指数、土壤有机碳蓄积指数间存在显著相关关系;海拔3000 m处Rao’Q与土壤养分循环指数、有机碳蓄积指数和EMF间均存在显著相关关系。(3)通过构建结构方程模型分析海拔梯度上植物功能多样性与EMF的关系可知,海拔以功能多样性为媒介作用于EMF,其中功能丰富度对EMF的影响最大,验证了功能多样性与EMF间存在互补效应。综上,随着海拔的变化,功能多样性会做出相应的变化,进而影响SEF和EMF,功能多样性对于维持EMF具有重要的意义。
Aims The relationship between biodiversity and ecosystem function is one of the hotspots in ecological research.In the past,the research on the relationship between biodiversity and ecosystem function only focused on the experimental or observational investigation of single ecosystem function(SEF),ignoring the most essential value that ecosystem can provide multiple functions and services at the same time.Identifying the relationship between plant functional diversity and ecosystem multifunctionality(EMF)can provide a clear understanding of changes in ecosystem function.Methods In this study,Bayanbulak alpine meadow was taken as the study area,and five altitude sites were set at an interval of 200 m from 2194 to 3062 m above sea level.Soil total nitrogen content,nitrate nitrogen content,ammonium nitrogen content,total phosphorus content,available phosphorus content,total potassium content,available potassium content,soil density,aboveground and underground biomass of plant community were selected to characterize EMF,which were closely related to nutrient cycling,soil organic carbon accumulation and plant growth.Important findings(1)The species composition of the plant community varied greatly along the altitude gradient,and the species richness at the altitude of 2600 m was significantly higher than that at the other altitudes.Functional evenness index(FEve),functional richness index(FRic)and functional dispersion index(FDis)all showed a“single peak”trend with the rise of altitude,and the highest values were found at 2600,2800 and 2800 m,respectively.Rao’quadratic entropy(Rao’Q)showed a monotonically decreasing trend.(2)FRic and FDis at each altitude were positively correlated with soil EMF,which accounted for 47%and 43%of the variation in EMF,respectively.FEve was significantly correlated with nutrient cycling index and soil organic carbon storage index at the altitude of 2600 m.Rao’Q at 3000 m was significantly correlated with soil nutrient cycling index,organic carbon storage and EMF.The relationship
作者
吕自立
刘彬
常凤
马紫荆
曹秋梅
LÜZi-Li;LIU Bin;CHANG Feng;MA Zi-Jing;CAO Qiu-Mei(Xinjiang Key Laboratory of Special Species Conservation and Regulatory Biology,Key Laboratory of Special Environment Biodiversity Application and Regulation in Xinjiang,College of Life Sciences,Xinjiang Normal University,Ürümqi 830054,China;Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Ürümqi 830054,China)
出处
《植物生态学报》
CAS
CSCD
北大核心
2023年第6期822-832,共11页
Chinese Journal of Plant Ecology
基金
国家自然科学基金(32160271)。
