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氮沉降对微生物分解森林地上凋落物过程的影响(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2016年01期
Page:
1-7
Column:
专题报道
publishdate:
2016-01-31

Article Info:/Info

Title:
Effects of nitrogen deposition on litter decomposition by microorganisms in forests
Article ID:
1000-2006(2016)01-0001-07
Author(s):
PENG Sai ZHANG Yakun GE Zhiwei RUAN Honghua*
Co-Innovation Center for the Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037,China
Keywords:
nitrogen deposition litter microorganism enzyme stoichiometry
Classification number :
S718.5
DOI:
10.3969/j.issn.1000-2006.2016.01.001
Document Code:
A
Abstract:
The litter decomposition processes by microorganism influenced the carbon sequestration and stabilization. Since tree species, methodology and the length of investigation time are different, three different response patterns of litter decomposition to the global increasing nitrogen deposition had been reported: promotion, suppression and no effect. The mechanisms of litter decomposition affected by nitrogen deposition might be as follows: ① The influences of nitrogen deposition in different concentration on the decomposition of cellulose differed from that of lignin. Because fungi and bacteria have a large biomass and high activity under the low concentration of nitrogen deposition, the opposite response occurs under the high concentration. However, nitrogen deposition promoted decomposition of litters which contained lower portion of lignin and restraint, the higher one according to previous researches.② There is no uniform mechanism of nitrogen deposition affecting extracellular enzyme. Therefore, the rates of litter decomposition responded differently in nitrogen deposition.③The decomposing process of cellulose and lignin in litters would be affected by increasing nitrogen deposition through influencing the microbial biomass, diversity, community composition and stoichiometry, etc.

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Last Update: 2016-02-25