Resource stoichiometry mediates soil C loss and nutrient transformations in forest soils

doi:10.1016/j.apsoil.2016.09.001

	Resource stoichiometry mediates soil C loss and nutrient transformations in forest soils
	Yin, Huajun 1; Phillips, Richard P.3; Liang, Rubiao 1; Xu, Zhenfeng 2; Liu, Qing 1
刊名	APPLIED SOIL ECOLOGY
	2016-12
卷号	108 页码:248-257
关键词	Rhizosphere Exudate Soil microbial community Soil carbon pool Nutrient availability Subalpine coniferous forest
ISSN号	0929-1393
DOI	10.1016/j.apsoil.2016.09.001
产权排序	1
文献子类	Article
英文摘要	Root exudation is increasingly being recognized as an important driver of ecosystem processes; however, few studies have examined the degree to which variations in exudate stoichiometry and soil resources affect microbial controls of nutrient availability and decomposition. We added root exudate mimics of varying chemical quality to soils collected from two adjacent forest stands (one a similar to 70 year-old spruce plantation, the other a similar to 200 year-old spruce-fir forest) that differ strongly in N availability. The exudate treatments were added for 50 consecutive days, and included water (control), C alone, N alone, and three combinations of C and N that varied stoichiometrically (i.e., C:N ratio of 10, 50 and 100). Exudate additions containing little or no N promoted the greatest losses of soil C in two soils, with the greatest losses occurring in the moderately labile (i.e., acid-extractable) fraction of the low N plantation soils. However, despite the uniformity of priming effects between sites (similar to 7% loss of soil C for both), there was little congruence in exudate-induced effects on microbial biomass and activity. In the plantation soils, exudates generally increased microbial biomass (especially fungi), accelerated N cycling and increased lignin-degrading enzyme activities relative to controls. In contrast, exudate additions to spruce-fir soils mostly decreased microbial biomass, decelerated N cycling, and had variable impacts on lignin degrading enzyme activities (decreased phenol oxidase but increased peroxidase). Collectively, this study suggests that while root exudates with low C and N have the potential to accelerate soil C losses by stimulating microbes to mine N from soil organic matter, the consequences of exudate inputs on nutrient fluxes are less predictable, and may hinge on the recalcitrance of (soil organic matter) SOM, N availability and microbial communities. (C) 2016 Elsevier B.V. All rights reserved.
学科主题	Agriculture/agronomy
URL标识	查看原文
WOS关键词	MICROBIAL COMMUNITY COMPOSITION ; EASTERN TIBETAN PLATEAU ; ROOT-INDUCED CHANGES ; ORGANIC-MATTER ; NITROGEN TRANSFORMATIONS ; CARBON INPUTS ; RHIZOSPHERE ; BACTERIAL ; ECOSYSTEM ; TURNOVER
WOS研究方向	Agriculture
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000386643800028
内容类型	期刊论文
源URL	[http://210.75.237.14/handle/351003/29900]
专题	成都生物研究所_生态研究
通讯作者	Liu, Qing
作者单位	1.Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration and Biodiversity Conservation, Chengdu Institute of Biology, Chinese Academy of Sciences, No. 9 Section 4, Renmin Nan Road, Chengdu, 610041, China; 2.Sichuan Agr Univ, Inst Forest & Ecol, Key Lab Ecol Forestry Engn, Chengdu 611130, Peoples R China 3.Indiana Univ, Dept Biol, 1001 E Third St, Bloomington, IN 47403 USA;
推荐引用方式 GB/T 7714	Yin, Huajun,Phillips, Richard P.,Liang, Rubiao,et al. Resource stoichiometry mediates soil C loss and nutrient transformations in forest soils[J]. APPLIED SOIL ECOLOGY,2016,108:248-257.
APA	Yin, Huajun,Phillips, Richard P.,Liang, Rubiao,Xu, Zhenfeng,&Liu, Qing.(2016).Resource stoichiometry mediates soil C loss and nutrient transformations in forest soils.APPLIED SOIL ECOLOGY,108,248-257.
MLA	Yin, Huajun,et al."Resource stoichiometry mediates soil C loss and nutrient transformations in forest soils".APPLIED SOIL ECOLOGY 108(2016):248-257.