兴安落叶松林不同强度火烧迹地土壤微生物群落特性研究

发布时间：2018-04-21 11:40

本文选题：火烧强度 + 火烧迹地　；参考：《植物研究》2017年04期

【摘要】：通过选取大兴安岭岭北部的兴安落叶松林重度、轻度火烧迹地以及为过火样地,运用磷脂脂肪酸分析方法(PLFAs),研究了火烧对0~5和5~10 cm土层的土壤理化性质和土壤微生物群落的结构特征的影响,并探讨了火烧当年土壤微生物群落生物量和群落结构的变化规律与影响因素。研究结果表明:0~5和5~10 cm土层的土壤pH、全钾、有效磷、黏砂比等土壤理化指标受到了火烧的显著性影响;不同火烧程度对微生物类群的生物量有影响,但不显著;重度火烧迹地的土壤微生物的群落结构指标革兰氏阳性菌/革兰氏阴性菌(G+/G-)以及真菌/细菌(F/B)与轻度和未过火样地具有显著差异。RDA分析指出,G+/G-受土壤含水量影响最大,F/B受pH影响最大。说明在火烧迹地的当年,土壤水分和pH是影响土壤微生物群落结构的最重要因素。
[Abstract]:By selecting the larch forest in the northern part of the Daxing'anling Mountains as heavy, lightly burned and overheated, The effects of fire on the soil physical and chemical properties and the structural characteristics of soil microbial communities in 0 ~ 5 and 5 ~ 10 cm soil layers were studied by using phospholipid fatty acid analysis method. The variation law and influencing factors of soil microbial community biomass and community structure in the year of burning were also discussed. The results showed that the soil pH, total potassium, available phosphorus, clay sand ratio and other physical and chemical indexes of the soil were significantly affected by fire, but the biomass of microbial group was affected by different burning degree, but it was not significant, and the soil pH, total potassium, available phosphorus and clay sand ratio were significantly affected by the soil pH, total potassium, available phosphorus and the ratio of clay to sand in the soil layer of 5 ~ 10 cm. Community structure Indexes of soil microbes in severe Burning areas: Gram-positive bacteria / Gram-negative bacteria G / G) and Fungi / bacterial F _ (-B) have significant differences from mild and unburned sites. RDA analysis shows that G / G-G- affected soil water content is significantly different from that in mild or unburned areas. F- / B was the most affected by pH. The results showed that soil moisture and pH were the most important factors affecting the structure of soil microbial community in the year of burning.
【作者单位】：牡丹江师范学院生命科学与技术学院;东北林业大学森林植物生态学教育部重点实验室;中国科学院生态环境研究中心城市与区域生态国家重点实验室;中国科学院大学;
【基金】：国家自然科学基金(30700639)~~
【分类号】：S714.3

【相似文献】