|本期目录/Table of Contents|

[1]李俊,吴福忠,杨万勤,等.高山草甸冬季凋落物分解过程中土壤动物对微生物群落结构的影响[J].应用与环境生物学报,2016,22(01):27-34.[doi:10.3724/SP.J.1145.2015.05007]
 LI Jun,WU Fuzhong,YANG Wanqin,et al.Effects of soil fauna on microbial community structure in foliar litter during winter decomposition in an alpine meadow[J].Chinese Journal of Applied & Environmental Biology,2016,22(01):27-34.[doi:10.3724/SP.J.1145.2015.05007]
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高山草甸冬季凋落物分解过程中土壤动物对微生物群落结构的影响()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
22卷
期数:
2016年01期
页码:
27-34
栏目:
研究论文
出版日期:
2016-02-25

文章信息/Info

Title:
Effects of soil fauna on microbial community structure in foliar litter during winter decomposition in an alpine meadow
作者:
李俊 吴福忠 杨万勤 谭波 彭艳 王滨 常晨晖
四川农业大学生态林业研究所,高山森林生态系统定位站,长江上游生态安全协同创新中心 成都 611130
Author(s):
LI Jun WU Fuzhong YANG Wanqin TAN Bo** PENG Yan WANG Bin & CHANG Chenhui
Long-term Research Station of Alpine Forest Ecosystems, Institute of Ecology & Forest, Sichuan Agricultural University, Collaborative Innovation Center of Ecological Security in the Upper Reaches of Yangtze River, Chengdu 611130, China
关键词:
高山草甸土壤动物土壤微生物PLFA凋落物分解季节性雪被
Keywords:
alpine meadow soil fauna soil microorganisms PLFA litter decomposition seasonal snow-cover
分类号:
Q948.12
DOI:
10.3724/SP.J.1145.2015.05007
摘要:
于2013年11月至2014年4月,采用微生物磷酸脂肪酸(PLFA)分析方法,以川西高山草甸代表物种黄花亚菊(Ajania nubigena)和黑褐苔草(Carex atrofusca)凋落物为研究对象,在雪被形成期、雪被稳定期和雪被融化期研究了凋落物分解过程中土壤动物对微生物群落结构及其多样性的影响. 结果表明:(1)整个冬季,土壤动物增加了黄花亚菊凋落物分解过程中微生物总PLFA含量、真菌PLFA含量以及细菌PLFA含量,提高了其真菌/细菌比例,减少了黑褐苔草中微生物总PLFA含量、真菌PLFA含量以及细菌PLFA含量,降低了其真菌/细菌比例;(2)在雪被形成期,黄花亚菊凋落物中土壤动物显著增加了真菌表征脂肪酸18:2ω6,9c的含量,但降低了细菌表征脂肪酸16:0、16:1ω9c、18:1ω7c的含量. 黑褐苔草凋落物中土壤动物显著增加了细菌表征脂肪酸18:1ω7c的含量,但降低了真菌表征脂肪酸18:2ω6,9c的含量. 雪被融化期,土壤动物显著增加了黑褐苔草凋落物中细菌表征脂肪酸16:1ω9c的含量,降低了细菌表征脂肪酸a15:0和微真核生物表征脂肪酸18:3和20:4的含量;(3)土壤动物对凋落物中微生物多样性的影响主要在雪被融化期,增加了黄花亚菊凋落物中微生物多样性、均匀性、丰富度和优势度指数,降低了黑褐苔草凋落物中微生物多样性和均匀性指数,增加了黑褐苔草凋落物中微生物丰富度和优势度指数. 这些结果表明,冬季恶劣环境条件下高山草甸土壤动物仍然对微生物的数量、群落结构和多样性具有显著的影响. (图3 表4 参37)
Abstract:
Interactions between soil fauna and microbial community in litter might ultimately manipulate the process of litter decomposition in terrestrial ecosystems. Little is so far known about such interactions during winter litter decomposition in cold biomes. This study aimed to understand the effects of soil faunal community on winter microbial community structure in folia litter during winter decomposition in cold biomes. Litterbags with foliar litter of Ajania nubigena and Carex atrofusca were respectively placed on the soil surface in an alpine meadow of Zhegu Mountain, Miyaluo Nature Reserve located in the upper reaches of Yangtze River and the eastern Tibet-Qingzang Plateau. After being incubated in situ on Nov. 13th, 2013, the litterbags were taken back on Dec. 6th, 2013 (Snow forming period, SFP), Mar. 5th, 2014 (Snow stable period, SSP) and Apr. 5th, 2014 (Snow melting period, SMP), respectively. The soil faunal and microbial communities in litter were measured by funnel method and phospholipid fatty acid (PLFA), respectively. The results showed that soil fauna generally increased the contents of total PLFA, fungal PLFA, and bacterial PLFA of microbial community in A. nubigena foliar litter, and raised the ratio of fungal PLFA to bacterial PLFA, but those in C. atrofusca foliar litter showed the opposite trends, implying that the interactions between soil faunal community and microbial community in winter litter decomposition depend on plant species. In the SFP, soil fauna increased fungal 18:2ω6,9c PLFA content in A. nubigena foliar litter, but decreased bacterial 16:0, 16:1ω9c and 18:1ω7c PLFA contents; soil fauna in C. atrofusca foliar litter increased bacterial 18:1ω7c PLFA content, but decreased fungal 18:2ω6,9c PLFA content. In the SMP, soil fauna in C. atrofusca foliar litter increased bacterial 16:1ω9c PLFA content, but decreased the contents of bacterial a15:0 PLFA, and micro-eukaryotic 18:3 and 20:4 PLFA. More significant effects of soil faunal community on microbial community structure in both foliar litters were observed in the SMP. During this period, soil fauna increased the indexes of Shannon-Wiener diversity, Pielou evenness, Margalef richness and Simpson dominance in microbial community of A. nubigena foliar litter. Meanwhile, soil fauna decreased the indexes of Shannon-Wiener diversity and Pielou evenness in microbial community of C. atrofusca foliar litter, but increased the indexes of Margalef richness and Simpson dominance in microbial community. The results indicated that soil faunal community in litter greatly affects the structure and biodiversity of microbial community in foliar litter even under harsh environmental conditions, which in turn run the process of winter litter decomposition in the alpine meadow.

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更新日期/Last Update: 2016-02-25