Differential mechanisms drive changes in soil C pools under N and P enrichment in a subalpine spruce plantation

doi:10.1016/j.geoderma.2019.01.027

	Differential mechanisms drive changes in soil C pools under N and P enrichment in a subalpine spruce plantation
	Huang, Junsheng 1; Liu, Lingli1 ; Qi, Kaibin 2; Yang, Tinghui 2; Yang, Bing ; Bao, Weikai ; Pang, Xueyong
	2019
发表期刊	GEODERMA
ISSN	0016-7061
卷号	340 页码:213-223
摘要	Nitrogen (N) and phosphorus (P) availabilities can affect soil C cycling by altering both plants and microbial activity. It remains unclear how the changes in plant and microbial processes could regulate C dynamics of different soil fractions, thereby affecting soil C sequestration. Based on a field fertilization experiment in a subalpine spruce plantation, we examined the effects of N, P and combined N and P addition (NP) treatments on plant C inputs, soil C contents and enzyme activities of bulk soil and different aggregate fractions. We aimed to explore the mechanisms by which N and P addition affected soil C sequestration. After 4-year fertilization, the N treatment increased soil C content by 21%, accompanied by suppressed polyphenol oxidase activity ( - 43%). However, the P and NP treatments decreased soil C content by 14% and 7%, respectively, accompanied by reduction in fine root biomass ( - 51% and - 50%, respectively). Fertilization also affected soil aggregate C pools, with decreased C content in the macroaggregates (5000-250 mu m; MaA) under the P and NP treatments, and increased C content in the silt and clay fraction ( < 53 mu m; S&C) under all fertilization treatments. The step-AIC analysis showed that the effects of fertilization on bulk soil C content were best explained by changes in soil polyphenol oxidase activity and fine root biomass. Overall, our results indicate that N-induced soil C accrual, mainly accumulating in the S&C, could be largely driven by the suppressed oxidase activity, and that decreases in soil C content under the P and NP treatments, mostly occurring in the MaA, was likely associated with the reduced C inputs by fine roots.
关键词	Soil C N enrichment P enrichment Soil enzyme activities Soil aggregate fractions
学科领域	Soil Science
DOI	10.1016/j.geoderma.2019.01.027
收录类别	SCI
语种	英语
WOS关键词	ROOT-DERIVED CARBON ; NITROGEN DEPOSITION ; ORGANIC-MATTER ; PHOSPHORUS LIMITATION ; BIOCHEMICAL-COMPOSITION ; MICROBIAL BIOMASS ; ENZYME-ACTIVITIES ; RESPONSES ; STORAGE ; SEQUESTRATION
WOS研究方向	Agriculture
WOS记录号	WOS:000457949200021
出版者	ELSEVIER SCIENCE BV
文献子类	Article
出版地	AMSTERDAM
EISSN	1872-6259
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31770658] ; National Key Research and Development Program of China [2017YFC0505002] ; Strategic Priority Research Program of the Chinese Academy of SciencesChinese Academy of Sciences [XDA20020401] ; Science and Technology Department of Sichuan Province [2018SZDZX0030, 18ZDYF0307]
作者邮箱	pangxy@cib.ac.cn
引用统计	被引频次：8[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/19402
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Chengdu Inst Biol, CAS Key Lab Mt Ecol Restorat & Bioresource Utiliz, Key Lab Sichuan Prov, POB 416, Chengdu 610041, Sichuan, Peoples R China 2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Huang, Junsheng,Liu, Lingli,Qi, Kaibin,et al. Differential mechanisms drive changes in soil C pools under N and P enrichment in a subalpine spruce plantation[J]. GEODERMA,2019,340:213-223.
APA	Huang, Junsheng.,Liu, Lingli.,Qi, Kaibin.,Yang, Tinghui.,Yang, Bing.,...&Pang, Xueyong.(2019).Differential mechanisms drive changes in soil C pools under N and P enrichment in a subalpine spruce plantation.GEODERMA,340,213-223.
MLA	Huang, Junsheng,et al."Differential mechanisms drive changes in soil C pools under N and P enrichment in a subalpine spruce plantation".GEODERMA 340(2019):213-223.

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