放牧影响下不同盖度金露梅灌丛草本植物叶功能性状与土壤因子的关系  

Relationship between Leaf Functional Traits of Herbaceous Plants and Soil Factors in Different Coverage Gradients of Potentilla fruticosa Shrub under Grazing

作　　者：朋措吉 宋明华[3] 周春丽 李以康[1,5] 李小娟[4] 曹广民[1,5] PENG Cuoji;SONG Minghua;ZHOU Chunli;LI Yikang;LI Xiaojuan;CAO Guangmin(Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810001, China;University of Chinese Academy of Sciences, Beijing 100039, China;Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;Qinghai Nationalities University, Xining 810007, China;Key Laboratory of Adaptation and Evolution of Plateau Organisms,Chinese Academy of Sciences,Xining 810001,China)

机构地区：[1]中国科学院西北高原生物研究所,西宁810001 [2]中国科学院大学,北京100039 [3]中国科学院地理科学与资源研究所,北京100101 [4]青海民族大学,西宁810007 [5]中国科学院高原生物适应与进化重点实验室,西宁810001

出　　处：《西北植物学报》2020年第5期870-881,共12页Acta Botanica Boreali-Occidentalia Sinica

基　　金：青海省重点研发与转化计划(2019-SF-152);青海省重大科技专项(2018-NK-A3);中国科学院科技服务网络计划(STS计划)区域重点项目;国家自然科学基金(41730752);青海省创新平台建设专项(2017-ZJ-Y20);青海省应用基础研究计划项目(2019-ZJ-7073)。

摘　　要：植物功能性状与环境因子的研究对认识不同环境梯度下植物群落的形成及对环境的适应机制具有重要意义。该研究以高寒金露梅(Potentilla fruticosa)灌丛草甸为研究对象,分析放牧影响下金露梅灌丛不同盖度梯度(金露梅灌丛盖度为0%、30%、60%和90%的灌草斑块)灌草斑块中草本植物叶功能性状与土壤因子的变化趋势及其相互关系。结果表明:(1)土壤容重(BD)、土壤pH和土壤养分在金露梅灌丛盖度梯度下差异显著,干柴滩金露梅灌丛具有明显的“沃岛效应”;随着金露梅灌丛盖度的递增,土壤理化性质变化趋势各有分异。(2)随着金露梅灌丛盖度的增加,比叶面积(SLA)显著上升,叶片厚度(LT)和叶片磷含量(LPC)呈显著下降趋势(P<0.05)。(3)比叶面积与叶片厚度呈负相关关系,与叶片氮磷含量(LNC、LPC)呈极显著负相关关系(P<0.01),与叶片碳含量(LCC)呈极显著正相关关系(P<0.01)。(4)RDA冗余分析表明,土壤因子对叶功能性状变异的平均解释变量达72.25%,影响植物功能性状的主导因子有土壤有机质(SOM)、土壤全氮(TN)、土壤有效氮(AN)、土壤有效钾(AK)和土壤容重(BD),但不同盖度金露梅灌丛群落中影响叶性状的主导因子存在差异。金露梅灌丛盖度较小(<30%)时受SOM和TN、AN的影响较大,而金露梅灌丛盖度较大时(>60%)时主要受AK和BD的影响。The plant functional traits and environmental factors is great significance for understanding the formation of plant community and its adaptation mechanism under different environmental gradients.Therefore,in this study,the Potentilla fruticosa shrub meadows was taken as the research object,and we analyzed the variation trends and interrelationships between the leaf functional traits of herbaceous plants and soil factors in different coverage gradients of P.fruticosa shrub plaques(coverage in shrub plaques was 0%,30%,60%and 90%)under the influence of grazing.Our research indicates that:(1)there were significant differences and different variation trends among soil bulk density(BD),soil pH,and soil nutrients under different coverage gradients of P.fruticosa shrub.And P.fruticosa shrub in the study area has obvious“Fertile Island effect”.(2)With the increase of P.fruticosa shrub overage,the specific leaf area(SLA)increased significantly,and leaf thickness(LT)and leaf phosphorus content(LPC)decreased significantly(P<0.05).The difference of LPC may be related to the element content of different species in the community.(3)SLA is negatively correlated with leaf dry matter content(LDMC)and LT to varying degrees,and is extremely significantly negatively related to leaf nitrogen and phosphorus content(LNC,LPC)(P<0.01),and significantly positively correlated with leaf carbon content(LCC)(P<0.01).(4)RDA redundancy analysis showed that the average explanatory variable of soil factors to leaf functional traits variation was 72.25%,and the dominant factors affecting plant functional traits were soil organic matter(SOM),soil total nitrogen(TN),soil available nitrogen(AN),and soil available potassium(AK)and soil bulk density(BD).However,with different cover distributions of P.fruticosa shrub,the dominant factors affecting plant leaf traits are different in different communities.Communities with 0%and 30%coverage of P.fruticosa shrubs were more affected by SOM,TN,and AN,while the communities with 60%and 90%of P.fruticosa shr

关 键 词：叶功能性状 金露梅灌丛 盖度梯度 土壤因子 

分 类 号：Q948.1[生物学—植物学]