Coupled carbon and silicon cycling and characteristics in a subtropical watershed, China

doi:10.1016/j.ecolind.2019.105897

	Coupled carbon and silicon cycling and characteristics in a subtropical watershed, China
	Lu, Yao 1,2; Gao, Yang 1,2,3; Han, Ning 1,2; Yan, Yunxian 1,2,4; Xie, Zixia 1,2,5; Jia, Junjie 1,2; Hao, Zhuo 1,2
刊名	ECOLOGICAL INDICATORS
	2020-03-01
卷号	110 页码:10
关键词	Silicon cycling Carbon cycling Silicate weathering Coupling cycle Subtropical Watershed
ISSN号	1470-160X
DOI	10.1016/j.ecolind.2019.105897
通讯作者	Gao, Yang(gaoyang@igsnrr.ac.cn)
英文摘要	Silicon (Si) and carbon (C) can couple at different timescales. Phytolith carbon fixation and silicate weathering are two key processes of this type of coupling. Silicate rock weathering sequesters CO2 and thus generates a net C sink, which is one way that C is removed from ecosystems. This study selected the Xiangxi River watershed as the research object, which is characteristic of typical watersheds found in subtropical regions, and continuously monitored for Si and C transfers in this basin. We were able to ascertain the Si and C coupled cycling relationship in this basin by analyzing the influence of environmental changes on these two elements. The main findings were as follows: (1) The atmospheric chemical CO2 sequestration rate in this subtropical basin was 14.2 kg hm(-2) yr(-1), wherein carbonates sequestered atmospheric CO2 at a rate of 5.4 kg hm(-2) yr(-1) and silicate rock sequestered atmospheric CO2 at a rate of 8.8 kg hm(2) yr(-1). (2) Both rainfall and vegetation type had significant effects on Si and C migration. Different characteristics of canopy interception of each tree species had obvious dissociation effects on dissolved organic carbon (DOC), while the absorption or dissociation effect on dissolved silicate (DSi) differed among the various tree species. Basin soil was enriched with a large amount of organic C during the dry season, which was subsequently exported during the rainy season. (3) The Si input into the watershed was less than the Si output (the net accumulation of Si was - 27 kg hm(2) yr(-1)), and the C input was greater than the C output (the net accumulation of C was + 2785 kg hm(2) yr(-1)). This study determined that the Xiangxi River watershed was an Si "source" and a C "sink". The results of this study can provide a reference for further study of the coupling relationship between Si and C, and provide support for the study of ecosystem material balance.
资助项目	National Natural Science Foundation of China[41871080] ; National Natural Science Foundation of China[51178439]
WOS关键词	DISSOLVED ORGANIC-MATTER ; SEDIMENT LOAD ; SEQUESTRATION ; STOICHIOMETRY ; DEPOSITION ; PHYTOLITHS ; DYNAMICS ; NITROGEN ; IMPACTS ; CLIMATE
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000507381800060
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/131290]
专题	中国科学院地理科学与资源研究所
通讯作者	Gao, Yang
作者单位	1.Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China 3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Ctr Environm Remediat, Beijing 100101, Peoples R China 5.Chinese Acad Sci, Key Lab Resource Utilizat & Environm Remediat, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Lu, Yao,Gao, Yang,Han, Ning,et al. Coupled carbon and silicon cycling and characteristics in a subtropical watershed, China[J]. ECOLOGICAL INDICATORS,2020,110:10.
APA	Lu, Yao.,Gao, Yang.,Han, Ning.,Yan, Yunxian.,Xie, Zixia.,...&Hao, Zhuo.(2020).Coupled carbon and silicon cycling and characteristics in a subtropical watershed, China.ECOLOGICAL INDICATORS,110,10.
MLA	Lu, Yao,et al."Coupled carbon and silicon cycling and characteristics in a subtropical watershed, China".ECOLOGICAL INDICATORS 110(2020):10.