南亚热带红椎和格木人工幼龄林土壤微生物群落结构特征

发布时间：2018-05-15 04:23

本文选题：南亚热带 + 固氮树种　；参考：《生态学报》2016年14期

【摘要】：采用氯仿熏蒸浸提法和磷脂脂肪酸法(Phospholipids fatty acid,PLFA)研究了我国南亚热带地区非固氮树种红椎(Castanopsis hystrix)和固氮树种格木(Erythrophleum fordii)人工幼龄林土壤微生物生物量与微生物群落结构特征。结果表明,在旱季和雨季,红椎幼龄林土壤微生物总PLFAs量,细菌PLFAs量、放线菌PLFAs量及丛枝菌根真菌PLFAs量均大于格木幼龄林。红椎幼龄林土壤PLFA Shannon多样性指数(H_(PLFA))在旱季和雨季均大于格木幼龄林。主成分分析表明,土壤微生物群落结构组成受到林分类型和季节的双重影响。冗余分析表明,土壤硝态氮(NO_3~--N)含量、土壤含水量、p H及土壤微生物生物量氮(MBN)与特征磷脂脂肪酸之间呈显著相关关系。以上结果表明固氮树种格木与非固氮树种红椎人工幼龄林对土壤微生物生物量和群落结构的影响存在显著差异。
[Abstract]:The soil microbial biomass and microbial community structure of non-nitrogen-fixing species Castanopsis hystrix and Erythrophum fordii were studied by chloroform fumigation and phospholipids fatty acidfas. The results showed that the total PLFAs, PLFAs, actinomycetes PLFAs and arbuscular mycorrhizal fungi PLFAs in red vertebrae young forest were higher than those in young grasses forest in dry season and rainy season. The soil PLFA Shannon diversity index of young red vertebra forest was higher than that of young forest in dry season and rainy season. Principal component analysis showed that the composition of soil microbial community was influenced by stand types and seasons. The redundancy analysis showed that there was a significant correlation between the content of NO3-N _ 3-N in soil, soil moisture content and soil microbial biomass nitrogen (MBN) and the characteristic phospholipid fatty acids. The results indicated that there were significant differences in the effects of nitrogen fixing trees on soil microbial biomass and community structure between red vertebrae plantation and non-nitrogen-fixing tree species.
【作者单位】：中国林业科学研究院森林生态环境与保护研究所国家林业局森林生态环境重点实验室;中国林业科学研究院热带林业实验中心;
【基金】：国家科技支撑计划项目(2012BAD22B01)
【分类号】：S714.3

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