摘要
植物功能群研究对草地生态系统功能的研究具有重要的作用。功能群划分标准多样,在异常降水条件下,功能群多样性对长期不同载畜率放牧的响应规律尚不明晰。本研究以内蒙古短花针茅荒漠草原为研究对象,通过分析异常降水年份,不同载畜率下植物群落性状加权平均值、物种丰富度及功能群多样性的差异性,解释植物功能群动态变化趋势,结果显示:年降水量明显增加可显著提高群落水平植物高度、冠(丛)幅、密度、生物量、叶面积和比叶面积,显著降低群落水平植物叶片生物量(P<0.05)。群落水平植物高度、冠(丛)幅和茎生物量随载畜率增加而显著降低,而重度放牧导致群落水平植株密度显著降低(P<0.05)。基于植物功能性状可将试验区57种植物划分为4个功能群,丰水年植物功能群多样性和物种丰富度显著高于干旱年,随着载畜率的增加,功能群多样性和物种丰富度显著降低(P<0.05)。综上可知,依据植物功能性状的差异性可将植物划分为不同的功能群,降水增加和载畜率降低可显著提高群落功能群多样性和物种丰富度。荒漠草原植物群落水平植物功能性状对年降水量明显增加有积极响应,对载畜率增加呈现出消极响应。但群落水平植物不同功能性状对二者的响应程度并不一致。通过本研究可以为荒漠草原生物多样性保护及生态系统服务提供理论依据。
Plant functional groups play an important role in grassland ecosystem functions.There are various classification standards for functional groups,but the use of functional groups as a plant classification method still lacks theoretical support.In the present study,the Stipa breviflora desert steppe in Inner Mongolia was studied to detect differences in community-weighted mean traits,species richness,and functional group diversity under different stocking rates,with an overall aim to explain the dynamic changes in plant functional groups.It was found that increased precipitation significantly increased the values of some community-weighted mean traits(plant height,width of the clump crown,density,individual biomass,leaf area,and specific leaf area)and significantly decreased the values of others(leaf biomass and individual leaf mass)(P<0.05).The values of the community-weighted mean traits of plant height,width of clump crown,and stem biomass decreased significantly with increasing stocking rate,and heavy grazing resulted in a significant reduction in the community-weighted mean trait of density(P<0.05).Based on plant functional traits,57 plants were divided into four plant functional groups.The diversity and species richness of plant functional groups were significantly higher in wet years than in dry years.The diversity and species richness of plant functional groups decreased significantly with increasing stocking rates(P<0.05).Overall,our results show that plants can be assigned to different functional groups according to their functional traits,and that increasing precipitation and decreasing the stocking rate can significantly increase the diversity and species richness of community functional groups.The responses of community-level plant functional traits on the desert steppe to increased precipitation and decreased stocking rate were consistent.However,the responses of individual plants with particular functional traits to different precipitation and stocking rates were not consistent.The results of this st
作者
李江文
裴婧宏
韩国栋
何邦印
李彩
LI Jiang-wen;PEI Jing-hong;HAN Guo-dong;HE Bang-yin;LI Cai(College of Life Sciences,Yan’an University,Yan’an 716000,China;Shaanxi Key Laboratory of Chinese Jujube,Yan’an University,Yan’an 716000,China;Key Laboratory of Grassland Resources of the Ministry of Education of China,Hohhot 010020,China)
出处
《草业学报》
CSCD
北大核心
2023年第11期212-222,共11页
Acta Prataculturae Sinica
基金
国家自然科学基金项目(31770500,31760143)
草地资源可持续利用教育部科技创新团队(IRT_17R59)
陕西省自然科学基础研究项目(2021JQ-623)
延安大学科研计划资助项目(YDBK2019-18)资助。
关键词
群落加权平均性状
异常降水
荒漠草原
载畜率
功能群多样性
community weighted mean trait
abnormal precipitations
desert steppe
stocking rate
functional group diversity
