Delineating the Role of Calcium in the Larqe-Scale Distiloution of Metal-Bound Organic Carbon in Soils

doi:10.1029/2021GL092391

	Delineating the Role of Calcium in the Larqe-Scale Distiloution of Metal-Bound Organic Carbon in Soils
	Wang, Simin 1; Jia, Yufu ; Liu, Ting ; Wang, Yiyun 1; Liu, Zongguang 1; Feng, Xiaojuan1
	2021
发表期刊	GEOPHYSICAL RESEARCH LETTERS
ISSN	0094-8276
卷号	48 期号:10
摘要	Metal-bound organic carbon (OC) is vital for the persistence of soil organic carbon (SOC). However, its relative importance in different land types (e.g., upland vs. wetland) remains unclear. Here by analyzing metal-bound OC by the classic citrate-bicarbonate-dithionite method (OCCBD) from 62 soils from contrasting environments, we find that OCCBD constitutes an equally important proportion of SOC (OCCBD%) in wetlands as in uplands. Land-use type and calcium (Ca) content are the best predictors of OCCBD%, likely owing to the contribution of OC directly associated with sulfate-extractable Ca (OCNa2SO4) and Ca's bridging and aggregating effect on OCCBD. By further separating OCNa2SO4, we find that OCNa2SO4 accounts for similar to 24% of OCCBD in Tibetan-Mongolian grasslands and its relative contribution to OC(CBD )shift in an S-shaped mode along the pH gradient (6-9). These findings highlight Ca's important effect on the distribution of metal-bound OC at regional scales. Plain Language Summary Organic carbon (OC) association with reactive metals is one of the key mechanisms promoting the persistence of soil organic carbon (SOC), in which reactive iron (Fe) and aluminum (Al) are considered to play major roles. However, the distribution of metal-bound OC in different land types (e.g., uplands vs. wetlands) and the role of calcium (Ca) therein remain unclear, hampering our ability to predict and protect this important OC pool. Here, we analyze metal-bound OC by the classic citrate-bicarbonate-dithionite method (OCCBD) from 62 soils spanning a wide range of environmental gradients. Contrary to the common assumption, we find that OCCBD constitutes an equally important fraction of SOC in wetlands as in uplands. Moreover, calcium (Ca) rather than Fe content is a key predictor for OC CBD in SOC in different land-use types. By further separating OC associated with sulfate-extractable Ca (OCNa2SO4), we show that about one quarter of OCCBD consists of OCNa2SO4 in Tibetan-Mongolian grasslands and its relative importance increases along the pH gradient (6-9). These findings highlight the important role of Ca in the large-scale distribution of metal-bound OC.
学科领域	Geosciences, Multidisciplinary
DOI	10.1029/2021GL092391
收录类别	SCI
语种	英语
WOS关键词	FERROUS IRON ; MOLECULAR FRACTIONATION ; MATTER ASSOCIATIONS ; FOREST SOILS ; STABILIZATION ; PRESERVATION ; ACID ; SEQUESTRATION ; DECOMPOSITION ; FERRIHYDRITE
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000658600300028
出版者	AMER GEOPHYSICAL UNION
文献子类	Article
出版地	WASHINGTON
EISSN	1944-8007
资助机构	National Natural Science Foundation of China [42025303, 41773067, 31988102]
作者邮箱	xfeng@ibcas.ac.cn
引用统计	被引频次：28[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/2S10CLM1/26788
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Wang, Simin,Jia, Yufu,Liu, Ting,et al. Delineating the Role of Calcium in the Larqe-Scale Distiloution of Metal-Bound Organic Carbon in Soils[J]. GEOPHYSICAL RESEARCH LETTERS,2021,48(10).
APA	Wang, Simin,Jia, Yufu,Liu, Ting,Wang, Yiyun,Liu, Zongguang,&Feng, Xiaojuan.(2021).Delineating the Role of Calcium in the Larqe-Scale Distiloution of Metal-Bound Organic Carbon in Soils.GEOPHYSICAL RESEARCH LETTERS,48(10).
MLA	Wang, Simin,et al."Delineating the Role of Calcium in the Larqe-Scale Distiloution of Metal-Bound Organic Carbon in Soils".GEOPHYSICAL RESEARCH LETTERS 48.10(2021).

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