IMHE OpenIR  > 山地表生过程与生态调控重点实验室
Short-term effect of nitrogen addition on microbial and root respiration in an alpine spruce ecosystem
Wang, Jian1,2; Wang, Genxu1; Hu, Zhaoyong1,2
Corresponding AuthorWang, Genxu
2017
Source PublicationInternational Journal Bioautomation
ISSN1314-1902
Volume21Issue:1Pages:145-159
Abstract

Soil respiration plays an important role in the carbon (C) flux of the global C cycle and is greatly affected by nitrogen (N) additions in the form of deposition or fertilization. The aim of this study was to investigate the response of total soil respiration (Rs), microbial respiration (Rm), and root respiration (Rr) to short-term N addition and the potential mechanisms of short-term N deposition influencing soil respiration in an alpine spruce ecosystem. Four N treatment levels (0, 50, 100, 150 kg N ha-1year-1) were applied monthly in a Picea balfouriana (commonly known as "alpine spruce") plantation beginning in November 2013 and Rs, Rm, and Rr were measured from May to November 2014. The results show that simulated N depositions stimulate Rs, Rm, and Rr and the beneficial effects decreased along N gradients from hourly to seasonal scales. The seasonal temperature coefficients (Q10) of Rs, Rm, and Rr ranged from 2.50 to 3.8, 2.99 to 4.63, and 1.86 to 2.96, while the diurnal Q10ranged from 1.71 to 2.04, 1.89 to 2.32, 1.42 to 1.75, and there was a similar trend with soil respiration along N gradients. In addition, Rr showed significant positive correlation with fine root biomass, and Rm was likely driven by soil enzyme related to the microbial C cycle in the growing season. Our results indicate that short-term N addition stimulated fine root biomass and soil enzymatic activity to bring about a potential increase in soil respiration rates under low-N addition, while the opposite occurred under high-N addition.

KeywordCarbon Deposition Ecology Forestry Nitrogen Soils
Indexed ByEI
Language英语
Accession numberAccession number:20171503551458
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/18590
Collection山地表生过程与生态调控重点实验室
Affiliation1.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, 9, Block 4, Renminnanlu Road, Wuhou District, Chengdu; 610041, China
2.College of Resource and Environment, Graduate University of Chinese Academy of Sciences, Beijing; 100049, China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Wang, Jian,Wang, Genxu,Hu, Zhaoyong. Short-term effect of nitrogen addition on microbial and root respiration in an alpine spruce ecosystem[J]. International Journal Bioautomation,2017,21(1):145-159.
APA Wang, Jian,Wang, Genxu,&Hu, Zhaoyong.(2017).Short-term effect of nitrogen addition on microbial and root respiration in an alpine spruce ecosystem.International Journal Bioautomation,21(1),145-159.
MLA Wang, Jian,et al."Short-term effect of nitrogen addition on microbial and root respiration in an alpine spruce ecosystem".International Journal Bioautomation 21.1(2017):145-159.
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