艾比湖地区冻融作用对土壤微生物数量和群落结构的影响

doi:10.7522/j.issn.1000-0240.2013.0176

冰川冻土 ›› 2013, Vol. 35 ›› Issue (6): 1590-1599.doi: 10.7522/j.issn.1000-0240.2013.0176

艾比湖地区冻融作用对土壤微生物数量和群落结构的影响

秦璐^1,2, 吕光辉*^1,2, 何学敏^1,2

1. 新疆大学绿洲生态教育部重点实验室, 新疆乌鲁木齐 830046;
2. 新疆大学资源与环境科学学院, 新疆乌鲁木齐 830046

收稿日期:2013-02-03 修回日期:2013-05-20 出版日期:2013-12-25 发布日期:2014-01-11
通讯作者: 吕光辉，E-mail: ler@xju.edu.cn E-mail:ler@xju.edu.cn
作者简介:秦璐（1985-），女，新疆奎屯人，2011年在新疆大学获硕士学位，现为在读博士研究生，主要从事区域生态系统与生态建模研究. E-mail: ql198588@163.com
基金资助:
国家自然科学基金项目(31060061)；新疆大学博士点基金项目(20106501110001)；国家自然科学基金重点项目(41130531)；国家自然科学基金项目(41261087)；教育部创新团队项目"新疆干旱区生态和水文系统对气候和环境变化的响应及社会适应机制研究"(IRT1180)资助

Effects of Freezing-Thawing on Soil Microbial Quantity and Community Structure Around the Ebinur Lake

QIN Lu^1,2, LV Guang-hui*^1,2, HE Xue-min^1,2

1. Xinjiang Key Laboratory of Oasis Ecology (Ministry of Education), Xinjiang University, Ürümq Xinjiang 830046, China;
2. College of Resources and Environmental Science, Xinjiang University, Ürümq Xinjiang 830046, China

Received:2013-02-03 Revised:2013-05-20 Online:2013-12-25 Published:2014-01-11

摘要/Abstract

摘要：

通过对艾比湖地区冻融阶段7个典型样地野外采样和室内分析，研究了冻融作用条件下土壤微生物数量与土壤性质的关系、土壤微生物数量变化特征和土壤微生物群落结构的变化特征. 结果表明：不同冻融阶段，不同种类微生物数量受到不同土壤理化因子的制约. 1月，细菌数量与土壤有机质含量呈显著正相关(P<0.05)，真菌数量与土壤含水量和土壤有机质含量呈极显著正相关(P<0.01)，与土壤全氮和土壤孔隙度呈显著正相关(P<0.05)；3月，只有真菌数量与土壤含水量呈极显著正相关(P<0.01)；4月，放线菌数量与土壤有机碳和全氮含量呈显著正相关(P<0.05)，然而与土壤pH值呈显著负相关(P<0.05). 总体来讲，冻结期土壤微生物数量较低，冻融后期(4月)达到峰值，其中，7 a 撂荒地的微生物数量最高，3 a撂荒地最低. 在研究区寒冷季节，微生物类群中放线菌占主导地位(81.9%)；融化阶段，则是细菌占主要地位(52.1%~53.9%).

关键词: 冻融作用, 季节冻土, 微生物数量, 群落结构

Abstract:

The relationship between soil microbial quantity and soil property, variation characteristics of soil microbial quantity and soil microbial community structure in seven typical plots during freezing-thawing in Ebinur Lake area were studied. The results show that: (1)different types of soil microbial quantity are dependent on physico-chemical factors at different stages of freezing-thawing.In January, bacteria quantity and soil organic matter content are significant positive correlation (P<0.05), fungi quantity has extremely significant positive correlation with soil water content and soil organic matter content (P<0.01), also has significant positive correlation with soil total N and soil porosity (P<0.05); in March, only fungi quantity has extremely significant positive correlation with soil water content (P<0.01); in April, actinomycetes quantity has significant positive correlation with soil organic carbon and total N(P<0.05), but has significant negative correlation with soil pH value (P<0.05); (2) soil microbial quantity is lower during frozen period in the study area(92 275-367 250 CFU·g^-1), and reaches a peak in the late freezing and thawing period (170 738-704 300 CFU·g^-1in April); 7-year abandoned land has the highest microbial quantity (434 625 CFU·g^-1), while 3-year abandoned land has the lowest one (177 435 CFU·g^-1); (3) in cold season, actinomycetes are dominant in the study area (81.9%); in thawing stage, bacterial is dominant (52.1%-53.9%). On the whole, soil microbial growth is limited by nitrogen source in this study area.

Key words: freeze-thaw action, seasonally frozen soil, microbial quantity, community structure

中图分类号:

Q938.1

秦璐, 吕光辉*, 何学敏. 艾比湖地区冻融作用对土壤微生物数量和群落结构的影响[J]. 冰川冻土, 2013, 35(6): 1590-1599.

QIN Lu, LV Guang-hui*, HE Xue-min. Effects of Freezing-Thawing on Soil Microbial Quantity and Community Structure Around the Ebinur Lake[J]. JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY, 2013, 35(6): 1590-1599.

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艾比湖地区冻融作用对土壤微生物数量和群落结构的影响

Effects of Freezing-Thawing on Soil Microbial Quantity and Community Structure Around the Ebinur Lake

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