Relationship between calcium forms and organic carbon content in aggregates of calcareous soils in northern China
文献类型：期刊论文
| 作者 | Dou, Xiaolu1,2; Zhang, Congzhi2; Zhang, Jiabao1,2; Ma, Donghao2; Chen, Lin2; Zhou, Guixiang2; Duan, Yan4; Tao, Lu2; Chen, Junxu3 |
| 刊名 | SOIL & TILLAGE RESEARCH
 |
| 出版日期 | 2024-12-01 |
| 卷号 | 244 |
| 关键词 | Calcareous soils Calcium forms Soil organic carbon Soil aggregates |
| ISSN号 | 0167-1987 |
| DOI | 10.1016/j.still.2024.106210 |
| 通讯作者 | Zhang, Jiabao(jbzhang@issas.ac.cn) |
| 英文摘要 | The agricultural soil organic carbon (SOC) pool is one of the most active C pools in terrestrial ecosystems, and soil aggregates are the main site of SOC fixation. Mineral sorption plays a crucial role in SOC accumulation. Calcium (Ca) is a typical soil mineral element that plays a crucial role in SOC accumulation and is fundamental for the formation of soil aggregates. Although Ca has been shown to regulate the stability of SOC, the relationship between different forms of Ca and SOC within aggregates in northern China remains unclear. In this study, we selected five soils (black soil, light chernozem soil, fluvo-aquic soil, sierozem soil, and loess soil) with different calcium carbonate (CaCO3) contents as the target materials. Water-stable aggregates were separated using the wet-sieving method. Soil respiration was measured using the static alkali absorption method (carbon dioxide [CO2] absorption by NaOH solution). The CaCO3 content was quantified using the CO2 gas volume method, and the continuous leaching method was used to analyze the different forms of Ca (water soluble-Ca, exchangeable-Ca, acid soluble-Ca, and bound to organic-Ca). In-situ field sampling was used to reveal the associations between different forms of Ca and SOC within aggregates. The results showed that besides the CaCO3 form, exchangeable-Ca (20.06 %-57.86 %) and bound to organic-Ca (26.69 %-73.91 %) were major Ca forms in calcareous soils. There was a nonsignificant negative correlation between CaCO3, acid soluble-Ca, and exchangeable-Ca and SOC in the bulk soil. However, there was a significant negative correlation among CaCO3, acid soluble-Ca, and exchangeable-Ca with SOC in macro-aggregates (> 0.25 mm) and micro-aggregates (0.25-0.053 mm). A 90-day incubation experiment was conducted to verify the previous speculations, which revealed that CaCO3 increased SOC mineralization and reduced the content of SOC, while enhancing the acid soluble-Ca and bound to organic-Ca content. In the treatment with added CaCO3, there was a negative correlation between acid soluble-Ca and bound to organic-Ca and SOC in bulk soil and macro-aggregates (> 0.25 mm). The effect of Ca2+ on SOC should not be ignored. Excessive Ca2+ may be converted into different forms of Ca to occupy the bonding sites for SOC on the surface of soil particles with silt and clay particles, forming a pseudo-aggregate structure, and the SOC traveling between soil particles, which is not conducive to SOC stabilization and accumulation. |
| WOS关键词 | MATTER DYNAMICS ; SIZE CLASSES ; STABILIZATION ; PROTECTION ; CLAY ; MINERALIZATION ; MECHANISMS ; STABILITY ; TILLAGE ; STORAGE |
| 资助项目 | National Key Research Development Program Projects[2022YFD1500502] ; National Key Research Development Program Projects[2022YFD1500903] ; Strategic Pioneering Science and Technology Special Project of Chinese Academy of Sciences[XDA28070105] ; Strategic Pioneering Science and Technology Special Project of Chinese Academy of Sciences[XDA28110105] ; China Agriculture Research System[CARS -03-15] ; China Agriculture Research System[CARS-52] |
| WOS研究方向 | Agriculture |
| 语种 | 英语 |
| WOS记录号 | WOS:001259121100001 |
| 出版者 | ELSEVIER |
| 资助机构 | National Key Research Development Program Projects ; Strategic Pioneering Science and Technology Special Project of Chinese Academy of Sciences ; China Agriculture Research System |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/136783]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Zhang, Jiabao |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Fengqiu Expt Stn Natl Ecosyst Res Network China, Nanjing 210008, Peoples R China 3.Water Conservat Management Serv Ctr, Beijing 102600, Peoples R China 4.Chinese Acad Sci, Hefei Inst Phys Sci, Hefei 230031, Anhui, Peoples R China |
| 推荐引用方式 GB/T 7714 | Dou, Xiaolu,Zhang, Congzhi,Zhang, Jiabao,et al. Relationship between calcium forms and organic carbon content in aggregates of calcareous soils in northern China[J]. SOIL & TILLAGE RESEARCH,2024,244. |
| APA | Dou, Xiaolu.,Zhang, Congzhi.,Zhang, Jiabao.,Ma, Donghao.,Chen, Lin.,...&Chen, Junxu.(2024).Relationship between calcium forms and organic carbon content in aggregates of calcareous soils in northern China.SOIL & TILLAGE RESEARCH,244. |
| MLA | Dou, Xiaolu,et al."Relationship between calcium forms and organic carbon content in aggregates of calcareous soils in northern China".SOIL & TILLAGE RESEARCH 244(2024). |
入库方式： OAI收割
来源：合肥物质科学研究院
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