Delineating the Role of Calcium in the Larqe-Scale Distiloution of Metal-Bound Organic Carbon in Soils
文献类型：期刊论文
| 作者 | Wang, Simin2; Jia, Yufu; Liu, Ting; Wang, Yiyun2; Liu, Zongguang2; Feng, Xiaojuan2
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| 刊名 | GEOPHYSICAL RESEARCH LETTERS
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| 出版日期 | 2021 |
| 卷号 | 48期号:10 |
| ISSN号 | 0094-8276 |
| DOI | 10.1029/2021GL092391 |
| 文献子类 | Article |
| 英文摘要 | 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. |
| 学科主题 | Geosciences, Multidisciplinary |
| 出版地 | WASHINGTON |
| 电子版国际标准刊号 | 1944-8007 |
| 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) |
| 语种 | 英语 |
| WOS记录号 | WOS:000658600300028 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 资助机构 | National Natural Science Foundation of China [42025303, 41773067, 31988102] |
| 源URL | [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.Univ Chinese Acad Sci, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, 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). |
入库方式： OAI收割
来源：植物研究所
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