藏南谷地湿地植物丛枝菌根真菌群落结构随海拔变化的驱动因素初探
Preliminary study on factors driving arbuscular mycorrhizal fungi diversity with elevation in the South-Tibet River Basin
欧阳建鑫 1李伟 1操瑜2
作者信息
- 1. 西藏大学理学院生态研究中心,拉萨 850000;中国科学院武汉植物园水生植物研究中心,武汉 430074
- 2. 中国科学院武汉植物园水生植物研究中心,武汉 430074;中国科学院武汉植物园,湿地进化与生态恢复湖北省重点实验室,武汉 430074
- 折叠
摘要
丛枝菌根真菌(Arbuscular mycorrhizal fungi,AMF)在维持高原湿地生态系统功能和促进其稳定性等方面发挥着重要作用,但AMF群落多样性及其构建过程对海拔的响应尚不清楚.本研究在藏南谷地沿4 200～5 100 m的海拔梯度进行了湿地植物调查、水体因子测定和土壤样品采集并分析.结果显示,藏南谷地湿地生态系统的AMF群落结构随海拔变异较大,其中以Glomus为优势属,且其相对丰度随海拔的上升呈显著下降的趋势.所有采样点中,AMF群落组成的差异以物种替换过程为主.变差分解结果表明,底泥和水体是解释AMF多样性海拔格局的主要环境因子.
Abstract
Arbuscular mycorrhizal fungi(AMF)play a vital role in maintaining the functionality and stability of plateau wetland ecosystems.However,the diversity of AMF communities along elevational gradients and their response to construction processes in the South-Tibet River Basin remain unclear.In this study,we conduc-ted a wetland plant community survey,measured the physicochemical properties of water in situ,and collec-ted sediment samples for further analysis across a high elevational gradient(4 200 to 5 100 m)in the South-Tibet River Basin.Results revealed that Glomus was the dominant genus within the Qinghai-Tibet Plateau wetland ecosystem.However,its relative abundance varied greatly with elevation,showing a significant de-clining trend with increasing elevation.Differences in AMF community composition were primarily due to species replacement.Variance partitioning analysis showed that the contribution of environmental variables to the AMF diversity-elevation patterns mainly involved sediment and water factors,with a lesser contribution from plant factors.These findings suggest that the establishment of the AMF community in the wetland habi-tat of the South-Tibet River Basin is predominantly governed by deterministic processes at high elevational gradients,reflecting a unique model of AMF community construction in the Qinghai-Tibet Plateau.However,further validation of these results is warranted.
关键词
丛枝菌根真菌/群落构建/多样性分析/青藏高原/湿地Key words
Arbuscular mycorrhizal fungi/Community assembly/Diversity analysis/Qinghai-Tibet Plateau/Wetland引用本文复制引用
基金项目
第二次青藏高原综合科学考察研究项目(2019QZKK0502)
出版年
2024
NETL
NSTL
维普
万方数据