摘要
森林演替会通过改变植物群落组成和土壤环境影响土壤生物群落,反过来,土壤生物群落的变化也会对生态系统的演替产生反馈作用,但迄今南亚热带森林演替过程中土壤生物群落的变化特征尚不清晰。本研究以广东省鼎湖山的南亚热带森林演替序列(马尾松(Pinus massoniana)林–针阔叶混交林–季风常绿阔叶林)为对象,研究了森林演替过程中土壤线虫多样性和群落结构的动态变化及其影响因素。通过采集不同演替阶段的土壤样品,分析和比对了不同演替阶段土壤线虫的多度、多样性、群落组成、土壤线虫生态指数以及土壤理化性质的差异。结果表明:(1)在南亚热带森林演替过程中,针阔叶混交林和季风常绿阔叶林土壤线虫的α多样性显著高于马尾松林,但土壤线虫总数和各营养类群多度及其相对丰度并无显著变化;(2)针阔叶混交林中土壤线虫富集指数显著高于马尾松林,表明其土壤养分状况要好于马尾松林,而季风常绿阔叶林土壤线虫结构指数较高,表明其受干扰程度较低;(3)针阔叶混交林的土壤含水量和土壤理化性质(除土壤总磷含量)已达到季风常绿阔叶林的水平,但两者的土壤pH值均显著低于马尾松林,而土壤pH值和土壤含水量是影响土壤线虫群落动态变化的主要因素。综上所述,南亚热带森林中土壤线虫多度、多样性和群落结构对森林演替的响应略有不同,演替过程中土壤环境因素的趋同是导致针阔叶混交林和季风常绿阔叶林中土壤线虫多样性和群落特征相似的主要原因。
Aims:The succession of southern subtropical forests can alter the composition of vegetation and soil environment,thus exerting a profound influence on soil biota.Consequentially,the changes in soil biota can then in turn influence the succession progress of the forest ecosystem.To date,the specifics related to the dynamics of soil biota during the succession of subtropical forests are not well understood.Here,we investigated the diversity and structural dynamics of the soil nematode community and associated it with environmental factors during the succession of forests(i.e.,Pinus massoniana forest(PF)–mixed pine and broadleaf forest(MF)–monsoon evergreen broadleaf forest(MEBF))in Dinghushan,Guangdong.Methods:Soil samples from each forest were collected.The abundance,diversity,community composition,and ecological indices of soil nematode community as well as soil properties were analyzed and compared amongst different forests.Results:(1)With the succession of southern subtropical forests,theαdiversity of soil nematodes was significantly higher in MF and MEBF than that in PF;however,there were no significant changes in the total abundance of soil nematodes or the relative abundance of different trophic groups.(2)The enrichment index of soil nematodes in MF was significantly higher than that in PF,thus indicating higher soil fertility in MF,while the higher structural index in MEBF indicated a decreased disturbance degree of the ecosystem.(3)The soil moisture content and soil properties(excluding soil phosphorus levels)in MF were at the same level as that in MEBF while the soil pH was significantly lower than that in PF.The soil pH and soil moisture content were the predominant factors for the dynamics of the soil nematode community.Conclusion:The responses of soil nematodes to vegetation succession are different in the abundance,diversity,and community composition,and the convergence of soil environment in the process of succession can explain the observed similarities in the nematode community between MF and
作者
吴文佳
袁也
张静
周丽霞
王俊
任海
刘占锋
Wenjia Wu;Ye Yuan;Jing Zhang;Lixia Zhou;Jun Wang;Hai Ren;Zhanfeng Liu(Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems/CAS Engineering Laboratory for Vegetation Ecosystem Restoration on Islands and Coastal Zones,South China Botanical Garden,Chinese Academy of Sciences,Guangzhou 510650;South China National Botanical Garden,Guangzhou 510650;Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458;University of Chinese Academy of Sciences,Beijing 100049)
出处
《生物多样性》
CAS
CSCD
北大核心
2022年第12期40-49,共10页
Biodiversity Science
基金
国家重点研发计划(2021YFC3100405)
广州市科技计划(202102020452,202102020491)
关键词
南亚热带森林
自然演替
多样性
土壤线虫
土壤健康
southern subtropical forest
natural succession
diversity
soil nematode
soil health
