喀斯特森林常见树种倒木分解对土壤真菌群落组成及分布规律的影响

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 喀斯特森林常见树种倒木分解对土壤真菌群落组成及分布规律的影响 DOI: 10.5846/stxb202101280295 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金项目（32060266，31700385）；贵州省科技计划项目（黔科合基础[2020]1Y124）；贵州省一流学科建设项目（GNYL[2017]007） Effects of fallen woods decomposition of common tree species on soil fungal community composition and distribution in karst forest Author: Affiliation: Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:倒木是森林生态系统的重要组分，其分解调控着土壤的养分循环，同时也影响着土壤微生物群落结构。但目前鲜见关于倒木分解对土壤微生物群落影响方面的报道。选取贵州茂兰喀斯特常绿落叶阔叶混交林中处于轻、中和重度腐烂等级的狭叶润楠（Machilus rehderi）、枫香（Liquidambar formosana）、青冈栎（Cyclobalanopsis glauca）和圆果化香（Platycarya longipes）4种常见树种倒木为研究对象，以距倒木外围的3个不同水平距离（10cm、30cm和50cm）的土壤样品为实验材料，分析倒木树种、腐烂等级和距离对土壤真菌种类及多样性的影响。结果表明：1）喀斯特森林4种树种倒木所影响土壤真菌群落在门级分类上主要为子囊菌门、担子菌门和毛霉门，优势属有Mortierella spp.、Phlebia spp.、Pluteus spp.和Chaetomium spp.等；2）倒木的树种对土壤真菌群落相对丰度的影响有差异，圆果化香倒木下的土壤真菌丰富度Chao1指数显著高于青冈栎；3）随腐烂程度加深，4种树种倒木下的土壤真菌群落多样性呈显著增加趋势；4）土壤真菌群落丰度随着距倒木距离的增大（10-50cm）变化明显，如狭叶润楠影响的Pluteus spp.、Mortierella spp.和Ganoderma spp.，枫香的Chaetomium spp.，圆果化香的Mortierella spp.和青冈栎的Phlebia spp.和Oliveonia spp.等。本研究量化了喀斯特森林倒木所影响的土壤真菌群落组成及分布规律，在一定程度上为倒木分解与土壤微生物群落之间的作用机制的深入探索提供了科学依据。 Abstract:Fallen wood is an important component of the forest ecosystem, which plays an important role in ecological conservation, biodiversity maintenance, and forest renewal. Its decomposition regulates the nutrient cycle of the soil and often changed to changes in microbial community structure of the soil. Therefore, quantify the influence of the fallen wood on soil fungus community and distribution is very significance. However, there are few reports about the effects of decomposition of fallen wood on soil microbial community, especially in Maolan kast evergreen broad-leaved deciduous mixed forest, a rare remaining subtropical karst forest with strong original in China and even the world. In this paper, the fallen woods of four common tree species (Machilus rehderi, Liquidambar formosana, Cyclobalanopsis glauca, and Platycarya longipes) that are in mildly, moderately and severely deciduous decay levels in Maolan's evergreen and deciduous broad-leaved mixed forest in Guizhou are selected as the research object. Three different horizontal distances (10 cm, 30 cm, and 50 cm) from the outer edge of the fallen wood were used to analyze the effects of tree species, decay grade and distance on the types and abundance of soil fungi community. The results show that:1) the soil fungi affected by the fallen woods of the four tree species in the karst forest are mainly Ascomycota, Basidiomycota and Mucor in the phylum classification, and the dominant genera are Mortierella spp., Phlebia spp., Pluteus spp. and Chaetomium spp., etc; 2) Different tree species of fallen woods have different effects on the relative abundance of soil fungi communities. The soil fungi richness Chao1 index under the fallen wood of the Platycarya longipes is significantly higher than that of Cyclobalanopsis glauca; 3) With the deepening of decay, the soil fungal community diversity under the fallen wood of the four tree species showed a significant increasing trend; 4) The abundance of soil fungal communities changes significantly with the increase of the distance from the fallen wood (10- 50 cm), such as Pluteus spp., Mortierella spp. and Ganoderma spp. are affected by Machilus rehderi, Chaetomium spp. of Liquidambar formosana, Mortierella spp. of Platycarya longipes, Phlebia spp. and Oliveonia spp. of Cyclobalanopsis glauca, etc. This study quantified the soil fungal communities composition and distribution patterns affected by fallen woods in karst forests, and provided a scientific basis for further exploration of the mechanism of interaction between soil microbial communities and fallen wood decomposition to some extent. 参考文献 相似文献 引证文献