Effects of short-term N addition on soil C fluxes in alpine Sibiraea angustata scrub on the eastern margin of the Qinghai-Tibetan Plateau

doi:10.1016/j.agrformet.2017.07.026

	Effects of short-term N addition on soil C fluxes in alpine Sibiraea angustata scrub on the eastern margin of the Qinghai-Tibetan Plateau
	Wang, Dong 2,3,4; He, Heliang 1,2; Gao, Qiao 2; He, Wei 2; Zhao, Chunzhang 2; Yin, Huajun 2; Liu, Qing 2
刊名	AGRICULTURAL AND FOREST METEOROLOGY
	2017-12-15
卷号	247 页码:151-158
关键词	Qinghai-Tibetan plateau Alpine scrub N deposition Soil C flux Fine root production Soil respiration
ISSN号	0168-1923
DOI	10.1016/j.agrformet.2017.07.026
产权排序	1
文献子类	Article
英文摘要	Although knowledge of the impact of N enrichment on soil C fluxes is scant, such information is highly critical for estimating the global C budget under elevated N deposition. To quantify the effects of short-term N addition on soil C sequestration in an alpine scrub ecosystem, we conducted a field experiment for Sibiraea angustata scrub on the eastern margin of the Qinghai-Tibetan Plateau in China. We quantified the soil C pool (030 cm) and C fluxes in litterfall, fine root (<2 mm diameter) production (FRP), and soil CO2 emission (heterotrophic respiration, R-h) over four years with four levels of N addition (N-0; control, N-20; 20, N-50; 50, and N-100, 100 kg N ha(-1) year(-1)). The results showed that at control plots the total C-input (433 +/- 33 g C m(-2) year(-1)) via FRP (360 +/- 34 g C m(-2) year(-1)) and litterfall (73 +/- 1 g C m(-2) year(-1)) was close to the C-output via Rh (466 +/- 5 g C m(-2) year(-1)), which demonstrates that the S. angustata scrub soil C is at equilibrium status. However, adding N, particularly the N100 treatment, significantly affected the soil C balance; the soil became a C sink (163 +/- 46 g C m(-2) year(-1)) by increasing FRP (+63%) rather than by increasing litterfall (P > 0.05) or reducing R-h (P > 0.05). As a result, the soil C pool (030 cm) increased significantly. In conclusion, these results suggest that fine roots play a dominant role in the C balance of an alpine scrub ecosystem due to large C-inputs to the soil. Moreover, short-term high N enrichment causes sequestration of additional atmospheric CO2, largely because of the stimulation of fine root growth rather than increased inputs of aboveground plant litterfall or reductions in soil CO2 emission.
学科主题	Agriculture/agronomy
URL标识	查看原文
WOS关键词	FINE-ROOT PRODUCTION ; TERRESTRIAL ECOSYSTEMS ; NITROGEN DEPOSITION ; CARBON STORAGE ; MICROBIAL BIOMASS ; IMPACTS ; CO2 ; PRODUCTIVITY ; RESPIRATION ; DYNAMICS
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000416186700014
内容类型	期刊论文
源URL	[http://210.75.237.14/handle/351003/29890]
专题	成都生物研究所_生态研究
作者单位	1.Chengdu Univ Technol, Coll Mat & Chem & Chem Engn, Chengdu 610059, Sichuan, Peoples R China 2.Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province,Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China; 3.China West Normal Univ, Coll Environm Sci & Engn, Nanchong, Peoples R China; 4.Univ Chinese Acad Sci, Beijing 10049, Peoples R China;
推荐引用方式 GB/T 7714	Wang, Dong,He, Heliang,Gao, Qiao,et al. Effects of short-term N addition on soil C fluxes in alpine Sibiraea angustata scrub on the eastern margin of the Qinghai-Tibetan Plateau[J]. AGRICULTURAL AND FOREST METEOROLOGY,2017,247:151-158.
APA	Wang, Dong.,He, Heliang.,Gao, Qiao.,He, Wei.,Zhao, Chunzhang.,...&Liu, Qing.(2017).Effects of short-term N addition on soil C fluxes in alpine Sibiraea angustata scrub on the eastern margin of the Qinghai-Tibetan Plateau.AGRICULTURAL AND FOREST METEOROLOGY,247,151-158.
MLA	Wang, Dong,et al."Effects of short-term N addition on soil C fluxes in alpine Sibiraea angustata scrub on the eastern margin of the Qinghai-Tibetan Plateau".AGRICULTURAL AND FOREST METEOROLOGY 247(2017):151-158.