Changes in organic carbon fractions and sources in deltaic topsoil and subsoil layers: autochthonous and allochthonous inputs
文献类型：期刊论文
| 作者 | Li, Yuan2,4,6 ; Fu, Chuancheng1,2,4; Zeng, Lin3; Zhou, Qian2,4; Zhang, Haibo5; Tu, Chen2,4,6; Li, Lianzhen2,4,6; Luo, Yongming1,2,4,6
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| 刊名 | EUROPEAN JOURNAL OF SOIL SCIENCE
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| 出版日期 | 2021-04-01 |
| 页码 | 16 |
| 关键词 | organic carbon fractionation organic carbon stabilization radiocarbon river delta soil organic matter subsoil |
| ISSN号 | 1351-0754 |
| DOI | 10.1111/ejss.13109 |
| 通讯作者 | Luo, Yongming(ymluo@issas.ac.cn) |
| 英文摘要 | River deltas are often considered as hotspots of atmospheric carbon regulation, but few studies have paid attention to the differences between topsoil and subsoil for carbon sequestration. Here physical and chemical stabilization mechanisms and sources of soil organic carbon (OC) accumulation in different soil layers of a major river delta (Yellow River delta) were studied by fractionation and isotopic analysis. We found that in topsoil, conversion from tidal flat to wetland substantially increases OC by 84%, whereas cotton cultivation decreases OC by 66%. Wetland with a high soil OC content is characterized by substantial accumulation of plant-derived OC and OC in mineral fractions. In subsoil, the OC variation is controlled by the yellow silt layer (YSL)-red clay layer (RCL) sequence. Although the weathering intensity of the RCL is much higher than that of the YSL, the OC age is younger in the RCL, indicating that the highly reactive, secondary minerals and iron oxides are capable of stabilizing younger organic carbon in transportation, deposition and post-pedogenic alteration. C-14 activity demonstrates that modern autochthonous OC is the main component of OC in wetland topsoil. In contrast, millennia-old allochthonous OC is the main component of OC in the subsoil layers, contributing 4-24% of total bulk soil OC. The higher delta C-13 values of carbon fractions (-24.3 to -21.4% for the intra-aggregate particulate organic matter fraction, intramicroaggregate silt and clay fraction, and free silt and clay faction) and bulk samples (similar to -22%) are likely to imply the contribution of aged OC in the Yellow River delta. This study offers direct confirmation that soil OC fractions and sources are influenced by different land-use types and pedological properties in characteristic soil layers. These findings suggest that biogeochemical alteration of the soil matrix controls OC stabilization mechanisms in the river sedimenttidal flat-wetland-farmland continuum. Highlights Land-use types and pedological features control OC storage in topsoil and subsoil, respectively. Reclamation strongly decreases content of all OC fractions and the proportion of fSC and rOC. Soil layers with distinct texture and mineral compositions lead to OC stratification in subsoil. The red clay layer in subsoil is capable of stabilizing both fresh and aged OC. |
| 资助项目 | National Natural Science Foundation of China[41701263] ; National Natural Science Foundation of China[42007022] ; National Natural Science Foundation of China[41991330] ; National Natural Science Foundation of China[41807418] |
| WOS研究方向 | Agriculture |
| 语种 | 英语 |
| WOS记录号 | WOS:000635628300001 |
| 资助机构 | National Natural Science Foundation of China |
| 源URL | [http://ir.yic.ac.cn/handle/133337/27362]  |
| 专题 | 烟台海岸带研究所_近岸生态与环境实验室 烟台海岸带研究所_中科院海岸带环境过程与生态修复重点实验室 |
| 通讯作者 | Luo, Yongming |
| 作者单位 | 1.Chinese Acad Sci, Inst Soil Sci, CAS Key Lab Soil Environm & Pollut Remediat, Nanjing 210008, Peoples R China 2.YICCAS, Shandong Key Lab Coastal Environm Proc, Yantai, Peoples R China 3.Ludong Univ, Sch Resources & Environm Engn, Yantai, Peoples R China 4.Chinese Acad Sci, CAS Key Lab Soil Environm & Pollut Remediat, Yantai Inst Coastal Zone Res YIC, Yantai, Peoples R China 5.Zhejiang Agr & Forestry Univ, Sch Environm & Resource Sci, Key Lab Soil Contaminat Bioremediat Zhejiang Prov, Hangzhou, Peoples R China 6.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Yuan,Fu, Chuancheng,Zeng, Lin,et al. Changes in organic carbon fractions and sources in deltaic topsoil and subsoil layers: autochthonous and allochthonous inputs[J]. EUROPEAN JOURNAL OF SOIL SCIENCE,2021:16. |
| APA | Li, Yuan.,Fu, Chuancheng.,Zeng, Lin.,Zhou, Qian.,Zhang, Haibo.,...&Luo, Yongming.(2021).Changes in organic carbon fractions and sources in deltaic topsoil and subsoil layers: autochthonous and allochthonous inputs.EUROPEAN JOURNAL OF SOIL SCIENCE,16. |
| MLA | Li, Yuan,et al."Changes in organic carbon fractions and sources in deltaic topsoil and subsoil layers: autochthonous and allochthonous inputs".EUROPEAN JOURNAL OF SOIL SCIENCE (2021):16. |
入库方式： OAI收割
来源：烟台海岸带研究所
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