西藏嵩草草甸植物功能群去除影响群落生物量及土壤理化性质  

Effects of Removal of the Plant Functional Groups on Vegetation Biomass and Soil Properties in Carex tibetikobresia Meadow

作　　者：胡雪 魏晶晶 马丽 张中华 秦瑞敏 常涛 苏洪烨 阿的哈则 袁访 李珊 周华坤[1] HU Xue;WEI Jing-jing;MA Li;ZHANG Zhong-hua;QIN Rui-min;CHANG Tao;SU Hong-ye;A Di-ha-ze;YUAN Fang;LI Shan;ZHOU Hua-kun(Qinghai Key Laboratory of Cold Restoration Ecology,Northwest Institute of Plateau Biology,Chinese Academy of Sciences,Xining,Qinghai Province 810008,China;Qinghai Normal University,Xining,Qinghai Province 810008,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院西北高原生物研究所,青海省寒区恢复生态学重点实验室,青海西宁810008 [2]青海师范大学,青海西宁810008 [3]中国科学院大学,北京100049

出　　处：《草地学报》2023年第11期3240-3250,共11页Acta Agrestia Sinica

基　　金：第二次青藏高原综合科学考察研究项目(2019QZKK0302);2020年第二批林业草原生态保护恢复资金——祁连山国家公园青海片区生物多样性保护项目(QHTX-2021-009);2020年中国科学院“西部之光”创新交叉团队-重点实验室专项课题(CASLWC-2021);青海省自然科学基金创新团队项目(2021-ZJ-902)资助。

摘　　要：气候变化导致生态系统生物多样性丧失,进而影响生态系统服务功能及其稳定性。在生物多样性与生态系统功能关系的研究当中,植物群落功能群多样性更能推动生态系统的运转。本研究利用为期两年的植物功能群去除实验研究短期(2a)植物功能群丧失对生态系统中群落生物量及土壤理化性质的影响。结果表明,与对照相比,短期(2a)去除莎草科植物功能群以及去除全部植物后,地上生物量显著降低(P<0.05),而地下生物量均无显著变化。与对照相比,短期(2a)不同植物功能群去除后土壤pH值均上升但差异不显著,土壤含水量均无显著变化,而土壤铵态氮、速效磷及速效钾含量显著降低(P<0.05)。研究表明,短期内优势功能群丧失对群落地上生物量存在显著负效应。优势功能群对其他功能群丧失后生物量的补偿作用也更强。土壤含水量的响应可能存在滞后效应,土壤速效养分对植物功能群丧失响应更为敏感。The loss of species due to climate change has profoundly affected ecosystem stability.Therefore,understanding how biodiversity loss affects ecosystem properties can provide valuable information for ecosystem stability management.In this study,the experiment of plant functional group removal for a short-term(2 a)was conducted to study the effects of the different removals on community biomass and soil properties in a Carex tibetikobresia meadow.The results showed that the aboveground biomass decreased significantly(P<0.05),but belowground biomass changed insignificantly in the different plant functional group removal treatments.Soil properties also changed under the different plant functional group removal treatments,among which,soil pH value increase insignificantly,soil water content also changed insignificantly,and some soil available nutrients decreased significantly(P<0.05).In conclusion,the loss of dominant functional groups of Sedge plants had a significant negative effect on aboveground biomass in the short-term(2a),and the functional group had a compensatory effect on community biomass after the loss of other functional groups.There might be a lag effect of soil water content in response to plant functional groups loss,while some soil available nutrients are more sensitive to the loss in the short term.

关 键 词：西藏嵩草草甸 植物功能群 去除实验 群落生物量 土壤理化性质 

分 类 号：S155.292[农业科学—土壤学]