大兴安岭典型灌丛-莎草泥炭地植物功能性状和功能多样性  

Plant functional traits and functional diversity of shrub-sedge peatland in Da Xing′an Mountains

作　　者：王东旭 王宪伟[1] 谭稳稳 王淑洁 杜宇 姜静宜 李琪 张豪 WANG Dongxu;WANG Xianwei;TAN Wenwen;WANG Shujie;DU Yu;JIANG Jingyi;LI Qi;ZHANG Hao(Key Laboratory of Wetland Ecology and Environment,Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun 130102,China;College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Sustainable Forest Ecosystem Management-Ministry of Education,School of Forestry,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]中国科学院东北地理与农业生态研究所,中国科学院湿地生态与环境重点实验室,长春130102 [2]中国科学院大学资源与环境学院,北京100049 [3]东北林业大学林学院,森林生态系统可持续经营教育部重点实验室,哈尔滨150040

出　　处：《生态学报》2025年第2期962-973,共12页Acta Ecologica Sinica

基　　金：国家自然科学基金面上项目(42271111);国家自然科学基金国际合作项目(42220104009)。

摘　　要：泥炭地生态系统功能很大程度上取决于群落中物种功能性状的变化,但目前的相关研究仍非常有限。研究对大兴安岭4个地区的灌丛-莎草泥炭地植物地上-地下部分开展调查和取样,系统分析了植物比叶面积,比根长,比根面积,叶片和根系碳、氮和磷含量及生物量,研究了泥炭地植物的功能性状。通过计算群落加权平均值和功能离散度、Rao二次熵指数及相关变异系数,结合生物多样性指数,探讨泥炭地生物多样性、功能性状及功能多样性间相关性。结果表明:(1)灌木柴桦叶中的氮、磷含量显著高于白毛羊胡子草,且柴桦比叶面积变异系数较高;(2)灌木细根比根长和比根面积显著小于莎草,但细根氮和磷含量显著高于莎草。而且,灌木叶片和细根生物量显著高于莎草;(3)功能离散度和Rao二次熵指数较低,且其变异系数高于生物多样性和群落加权平均值各指数的变异系数;(4)灌木与莎草表现出地上-地下性状相关性上的差异,灌木根长与根面积显著正相关,莎草叶片和根系碳、氮和磷含量分别表现出了显著正相关,而功能离散度和Rao二次熵指数与生物多样性各指数相关性呈现一致性,其存在较强的耦合关系。研究结果表明,大兴安岭泥炭地物种间对资源竞争较大,灌木更适应泥炭地贫营养的环境。Peatland ecosystem functions largely depend on the functional traits of the species.Although the plant functional traits and functional diversity have been considered as the key parameters to predict the response of peatland carbon cycling to the climate change,the studies are still limited.Here,we systematically investigated the specific leaf area,specific root length,specific root area,and the carbon,nitrogen,phosphorus,and biomass contents of leaf and root tissues in four shrub-sedge peatlands of the Da Xing′an Mountains.The community weighted mean(CWM)value,function dispersion index,Rao′s quadratic entropy index,and coefficient of variation value were used to estimate the functional traits of plants in the shrub-sedge peatland.Combined with the biodiversity indices,we analyzed the relationships among biodiversity,functional traits,and functional diversity.Results showed that:(1)The nitrogen and phosphorus contents of leaves of shrub(Betula fruticosa)were significantly higher than those of sedge(Eriophorumvaginatum),while the coefficient of variation of the specific leaf area of Betula fruticosa was lower than that for Eriophorumvaginatum;(2)The specific root length and the specific root area of the shrub fine roots were significantly lower than those of the sedge,while the nitrogen and phosphorus contents of the shrub fine roots were significantly higher than those of the sedge.In addition,the leaf and fine root biomass of the shrub was significantly higher than that of the sedge.(3)The functional dispersion index and Rao′s quadratic entropy index of plants inhabiting in shrub-sedge peatlands were very low,and their coefficient of variation was higher compared to the indices of biodiversity and community weighted mean;(4)The relationship between above-and below-ground plant tissues traits of the shrub was different from that of the sedge.Shrub root length was significantly positively related to the root area.In addition,the carbon,nitrogen,and phosphorus contents of the sedge leaves and roots were posit

关 键 词：叶功能性状 根系功能性状 生物多样性 功能多样性 泥炭地 

分 类 号：Q948[生物学—植物学]