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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue Jan 2015, 36 (1)                                                                                                             Back



nstantaneous and historical temperature effects on a-pinene

Responses of microbial respiration to nitrogen addition in two

alpine soils in the Qinghai-Tibetan Plateau

 

 

Y.H. Gao1,2*, G. Ma3, X.Y. Zeng4, S.Q. Xu3 and D.X. Wang3

1Key Laboratory of Mountain Environment Evolution and Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu-610041, P.R. China

2Institute of Environment Sciences, University of Quebec, Montrea-H3C3P8, Canada

3College of Resources and Environment, Gansu Agricultural University, Lanzhou-730070, P.R. China

4Department of Landscape Architecture, Sichuan College of Architectural Technology, Deyang-618000, P.R. China

*Corresponding Author E-mail: yhgao@imde.ac.cn

 

 

 

Publication Data

Paper received:

31 August 2013

 

Revised received:

17 February 2014

 

Accepted:

24 July 2014

 

Abstract

An incubation experiment was conducted to examine the effects of nitrogen (N) application on microbial respiration in alpine meadow and alpine shrub soils from eastern of Qinghai-Tibetan Plateau. Four different levels of nitrogen fertilization were selected in this study: control (CK, 0 mg N g-1), low (LN, 0.04 mg N g-1), medium (MN, 0.16 mg N g-1), high (HN, 0.4 mg N g-1). The results showed that microbial respiration was higher in alpine shrub than in alpine meadow soil, regardless of the rate of N application. Total microbial respiration over the course of incubation period decreased in both soils with HN and MN treatments relative to control, but no significant differences were observed in soils with LN treatments. There was significantly positive correlation between total microbial respiration and dissolved organic carbon concentration in both soils. The results indicated that DOC may be a useful indicator of microbial respiration rate in alpine soils and the increasing N inputs could drive a negative feedback to global warming effects of carbon dioxide emitted to the atmosphere in alpine soils. ?  

 

 Key words

 

Alpine shrub soil, Carbon cycle, Fertilization, Microbial CO2, Nitrogen deposition 

 

 

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