湿地凋落物分解过程中土壤微生物群落结构的变化  

Changes in Soil Microbial Communitystructure during Litter Decomposition in Wetland

作　　者：王建波[1] 付晓玲[1] 刘晓佳[1] 倪红伟 Wang Jianbo;Fu Xiaoling;Liu Xiaojia;Ni Hongwei(Institute of Natural Resources And Ecology.HAS.,Harbin 150040;Heilongjiang Academy of Forestry,Harbin 150081,China)

机构地区：[1]黑龙江省科学院自然与生态研究所,哈尔滨150040 [2]黑龙江省林业科学院,哈尔滨150081

出　　处：《国土与自然资源研究》2022年第2期85-87,共3页Territory & Natural Resources Study

基　　金：黑龙江省科学院预研项目(YY2021ZR02)。

摘　　要：凋落物分解是生态系统营养物质循环的关键过程,在凋落物分解过程中,其中凋落物起着极其重要的作用。因此研究凋落物分解过程中土壤微生物群落组成的变化具有重要意义。本文采用野外原位分解袋的方法,对凋落物分解过程中土壤微生物群落的变化进行了初步研究。结果表明,(1)随着凋落物分解的进程,土壤微生物群落20:00、17:1isoω9c、17:0 anteiso、17:1 anteiso、22:0 iso、19:0 cycloω7c、18:1ω9c含量升高、而14:0、16:0、19:0 cycloω9c、18:1ω7c、16:010-methyl含量降低;(2)与凋落物分解120 d相比,凋落物分解390 d后,土壤中真菌和细菌群落的磷脂脂肪酸含量均有所增加,说明凋落物分解为土壤微生物提供了养分;(3)凋落物分解390 d后,土壤革兰氏阳性菌/革兰氏阴性菌比值和19:0 cycloω7c/18:1ω7c比值均发生显著变化。Litter decomposition is an important ecosystem function,litter decomposition is the key process of nutrient cycling in ecosystem,and soil microorganisms play an important role during litter decomposition.Therefore,it is of great significance to study the changes of soil microbial community during litter decomposition.In the study,we investigated these changes using a litter bag method in-situ.The results showed that,(1)during litter decomposition,the concentrations of 20:0,17:1 isoω9c,17:0 anteiso,17:1 anteiso,22:0 iso,19:0 cycloω7c and 18:1ω9 cincreased,and the concentrationsof 14:0,16:0,19:0 cycloω9c,18:1ω7c,16:0,10 methyl decreased;(2)compared with 120 days of litter decomposition,the PLFAs of fungi and bacteria in soil increased after 390 day of litter decomposition;(3)after 390 days of litter decomposition,the Gram-positive bacteria to Gram-negative bacteria ratio(G+/G-)and the 19:0 cycloω7c/18:1ω7c ratio of the soil microbial community changed significantly.

关 键 词：土壤微生物群落 凋落物分解 磷脂脂肪酸法 

分 类 号：S714.3[农业科学—林学]