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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP
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    Abstract - Issue Nov 2018, 39 (6)                                     Back


nstantaneous and historical temperature effects on a-pinene

Effect of nitrogen addition on carbon and nitrogen stable isotopes in temperate forest litter and soil

 

N. Wu1,2*, H. Qian1, Y. Tan1 and Y. Wang3

1School of Municipal and Environmental Engineering, Shenyang Jianzhu University, Shenyang-110 168, China

2Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang-110 164, China

3China Energy Engineering, Corporation Limited, Liaoning Institute, Shenyang-110 179, China

*Corresponding Author E-mail: nanawu0816@xmu.edu.cn

 

 

 

Key words

Carbon stable isotope

Changbai mountain

Korean pine forest

Nitrogen deposition

Nitrogen stable isotope

 

 

 

Publication Data

Paper received : 03.11.2017

Revised received : 13.02.2018

Re-revised received : 20.04.2018

Accepted : 23.04.2018

 

Abstract

Aim: The aim of this study was to investigate the changes of litter and soil carbon and nitrogen stable isotopes in temperate forest ecosystem under nitrogen addition.      

 

Methodology: In a mixed broad-leaf Korean pine forest in Changbai Mountain, China after 6 years of nitrogen addition (50 kg?ha-2?yr-1) treatment, the content of organic carbon and nitrogen, stable isotopes of carbon and nitrogen in litter and soil layer were determined by elemental analyzer and isotope ratio mass spectrometer.????  

 

Results: The results showed that the carbon concentration decreased with soil depth in the control and treatment samples. The nitrogen concentration had a tendency to increase in the decomposed litter layer. Nitrogen addition did not show significant effect on carbon and nitrogen concentration. The carbon stable isotope (d13C) was about -27? in forest cover layer and organic matter layer, while it was as high as -25.3? in mineral soil layer. Nitrogen addition had no significant effect on the value of d13C. The range of nitrogen stable isotope (d15N) was -1.6 ~ 5.5?, which increased with the depth of soil. d15N value increased significantly (P = 0.039) in the decomposed litter layer under nitrogen addition.       

 

Interpretation: d15N enrichment implied that more 15N was remaining under nitrogen addition. This indicated that nitrogen deposition enhanced the decomposition of organic matter implied by d15N enrichment in the decomposed litter layer, although carbon content did not show significant change. This study provides a data support for further studies on the effects of nitrogen deposition on forest ecosystems.

 

 

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