摘要
植物入侵在全球范围内广泛发生,严重破坏了当地生态系统的生物多样性和稳定性,并且通过生物因素与非生物因素改变了生态系统结构与功能.土壤线虫是土壤生物类群中一个重要结构单元,对生物入侵非常敏感,但目前关于土壤线虫群落对植物入侵的响应机制尚不清楚.以黄淮海平原人工林为研究对象,对比白杨(Populus alba)林、火炬树(Rhus typhina)林以及火炬树–白杨混交林中土壤线虫群落特征的差异,探讨火炬树入侵白杨人工林后对土壤线虫群落结构的影响及其机制.结果显示,火炬树入侵对白杨人工林土壤线虫群落多度和多样性无显著影响,但显著改变了土壤线虫群落各营养类群.火炬树林、混交林的食细菌线虫相对多度比白杨林的分别高18.53%、19.26%,同时,火炬树林、混交林的植食性线虫相对多度比白杨林的分别低25.81%、25.88%.火炬树入侵后土壤pH值和硝态氮含量均具有增加的趋势.植食性线虫相对多度与土壤硝态氮含量、土壤pH值呈显著负相关,而食细菌线虫相对多度与土壤硝态氮含量、土壤pH值呈正相关.上述结果表明火炬树入侵后土壤环境发生改变,可能在资源机遇机制下调控了土壤线虫营养类群,导致土壤微食物网改变,进而影响整个生态系统过程.
Plant invasion is widespread globally,posing serious threats to biodiversity and ecosystem stability by altering both biotic and abiotic factors.Soil nematodes,as a key structural component of soil biota and highly sensitive to biological disturbances,have become important indicator organisms for detecting ecosystem changes.However,existing studies report inconsistent effects of plant invasion on soil nematode community structure,and the underlying mechanisms remain unclear.This study investigates the impact and potential mechanisms of Rhus typhina invasion on soil nematode community structure within Populus alba plantation ecosystems.Results showed that while R.typhina invasion did not significantly affect the overall abundance or diversity of soil nematodes,it significantly altered the community composition.Specifically,the relative abundance of bacterivore nematodes increased significantly by 18.53%and 19.26%in the R.typhina forest and mixed forest,respectively,compared to the P.alba forest.In contrast,the relative abundance of herbivorous nematodes decreased significantly by 25.81%and 25.88%.Additionally,soil nitrate nitrogen content and pH tended to increase with R.typhina invasion.The relative abundance of herbivorous nematodes showed significant negative correlations with both soil nitrate nitrogen and pH,while the relative abundance of bacterivorous nematodes was positively correlated with these soil parameters.These findings suggest that R.typhina invasion alters the soil environment and shifts the composition of soil nematode trophic groups,thereby modifying the soil micro-food web and influencing broader ecosystem processes.
作者
邱晓杰
马远超
袁蓉
赵冰慧
冯佳睿
贺平平
朱振予
刘银占
向双
彭幼红
QIU Xiaojie;MA Yuanchao;YUAN Rong;ZHAO Binghui;FENG Jiarui;HE Pingping;ZHU Zhenyu;LIU Yinzhan;XIANG Shuang;PENG Youhong(Chengdu Institute of Biology,Chinese Academy of Science,Chengdu 610213,China;School of Life Sciences,Henan University,Kaifeng 475004,China;State-owned Nanwan Forest Farm in Xinyang City,Xinyang 464099,China)
出处
《应用与环境生物学报》
北大核心
2025年第11期1713-1721,共9页
Chinese Journal of Applied and Environmental Biology
基金
国家自然科学基金项目(323716666,31870358)
四川省自然科学基金项目(2023NSFSC0203)
河南省高等学校重点科研项目计划(23A180013)资助。
关键词
植物入侵
土壤线虫
群落结构
食细菌线虫
植食性线虫
plant invasion
soil nematode
community structure
bacterivore nematode
herbivorous nematode
