喀斯特峰丛洼地不同演替阶段土壤微生物多样性及影响因素

发布时间：2018-07-07 22:00

本文选题：土壤微生物 + 植被　；参考：《江西农业大学》2015年硕士论文

【摘要】：本研究以喀斯特峰丛洼地草丛(T)、灌丛(S)、次生林(SF)、原生林(PF)4个演替阶段,每个演替阶段各选择4种典型代表性植物群落类型,通过常规分析及现代分子技术手段,分析土壤微生物多样性及其影响因素,试图阐明喀斯特峰丛洼地植被演替、植物群落类型及土壤环境对土壤微生物的影响,为喀斯特石漠化治理提供理论依据及借鉴基础。主要结果如下:(1)不同植被演替阶段土壤细菌与真菌群落结构不同,同一植被演替阶段不同植物群落土壤细菌与真菌的群落结构不同,同一植物群落根际与非根际土壤细菌与真菌的群落结构不同。不同植被演替阶段土壤细菌与真菌相似性差异较大,且土壤真菌相似性高于细菌相似性。(2)不同植被演替阶段植物群落对土壤细菌群落多样性影响不同,但对非根际土壤真菌群落多样性的影响均达到显著水平。(3)不同植被演替阶段植物群落根际与非根际土壤理化性状差异较大。土壤全氮是极显著影响根际与非根际土壤细菌shannon-wiener指数的主要土壤因子、细菌丰富度(S)的主要土壤因子;全钾是极显著影响土壤根际与非根际细菌均匀度(EH)的主要土壤因子。(4)土壤p H与草丛阶段根际土壤真菌shannon-wiener指数呈极显著相关。
[Abstract]:In this study, four typical plant community types were selected in each succession stage, including grass (T), shrub (S), secondary forest (SF) and primary forest (PF) in karst peak forest depression, and four typical plant community types were selected by conventional analysis and modern molecular techniques. This paper analyzes the diversity of soil microorganisms and its influencing factors, and attempts to elucidate the effects of vegetation succession, plant community types and soil environment on soil microbes in karst peak cluster depressions, in order to provide theoretical basis and reference basis for karst rocky desertification control. The main results are as follows: (1) the community structure of soil bacteria and fungi is different in different vegetation succession stages, and the structure of soil bacteria and fungi is different in the same vegetation succession stage. The community structure of bacteria and fungi is different between rhizosphere and non-rhizosphere soil of the same plant community. The similarity of soil bacteria and fungi in different vegetation succession stages was different, and the similarity of soil fungi was higher than that of bacteria. (2) the effects of plant communities on the diversity of soil bacterial communities were different in different vegetation succession stages. But the effect on the diversity of fungi community in non-rhizosphere soil reached significant level. (3) the physical and chemical properties of rhizosphere and non-rhizosphere soil in different vegetation succession stages were different greatly. Soil total nitrogen was the main soil factor which significantly affected the shannon-wiener index of bacteria in rhizosphere and non-rhizosphere soil, and the main soil factor of bacterial richness (S). Total potassium was the main soil factor that significantly affected the soil rhizosphere and non-rhizosphere bacterial evenness (EH). (4) soil pH was significantly correlated with the shannon-wiener index of rhizosphere fungi in the herbaceous stage.
【学位授予单位】：江西农业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S154.3

【参考文献】