模拟干旱对亚热带森林土壤微生物生物量及群落结构的影响

发布时间：2018-02-26 23:37

本文关键词： 干旱环境土壤微生物磷脂脂肪酸亚热带森林　出处：《复旦学报(自然科学版)》2017年01期 　论文类型：期刊论文

【摘要】：土壤微生物作为生态系统的重要组成部分,在生态系统的物质转化和能量流动等生物地球化学循环过程中起着重要作用.本文以亚热带典型森林为研究对象,通过设置隔离穿透水的干旱处理、样地建设影响的干扰处理,以及自然状态下的空白对照处理,利用磷脂脂肪酸(Phospholipid Fatty Acid,PLFA)分析法,研究了干旱环境对森林生态系统土壤微生物生物量及群落结构的影响.结果表明:不同处理方式对土壤温度影响差异不显著,但干旱显著降低了土壤湿度.与对照组相比,干扰处理下土壤微生物生物量与群落结构没有显著变化,干旱处理轻微显著降低了3个土层土壤微生物总PLFAs、细菌和真菌PLFAs含量(P0.1).干旱对i15:0和16:0两种表征细菌的脂肪酸含量没有显著影响,但对a15:0,i16:0,16:12OH和18:1ω7c等4种表征细菌的脂肪酸含量影响明显.土壤微生物总PLFAs含量与土壤含水量在干旱处理下显著正相关,而在干扰和对照处理下呈现负相关关系.这些结果表明,干旱影响了森林生态系统土壤微生物生物量及群落结构,并且土壤水分是引起干旱条件下微生物生物量变化的关键因素.
[Abstract]:As an important part of the ecosystem, soil microorganisms play an important role in the biogeochemical cycle such as material transformation and energy flow in the ecosystem. By setting up the drought treatment of isolated penetrating water, the interference treatment of sample construction, and the blank control treatment under natural condition, the phospholipid Fatty acid acid (PLFA) method was used to analyze phospholipid phospholipid (Phospholipid) of phospholipid acid (Phospholipid). The effects of drought on soil microbial biomass and community structure in forest ecosystem were studied. The results showed that the effects of different treatments on soil temperature were not significant, but drought significantly decreased soil moisture. There was no significant change in soil microbial biomass and community structure under disturbance treatment. Under drought treatment, the total PLF Asand the PLFAs content of bacteria and fungi were slightly and significantly decreased in three soil layers, but there was no significant effect of drought on the fatty acid contents of i15: 0 and 16: 0. However, the fatty acid contents of bacteria were significantly affected by A15: 0: 16: 12 OH and 18: 1 蠅 7c. The total PLFAs content of soil microorganisms was positively correlated with soil water content under drought treatment, but negatively correlated with that of control treatment. Soil microbial biomass and community structure were affected by drought, and soil moisture was the key factor to change microbial biomass under drought conditions.
【作者单位】：复旦大学生物多样性科学研究所教育部生物多样性与生态工程重点实验室;华东师范大学生态与环境科学学院;安徽农业大学生命科学学院;
【基金】：国家自然科学基金(31370489)
【分类号】：S714.3

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