Soil macroaggregates determine soil organic carbon in the natural grasslands of the Loess Plateau
文献类型：期刊论文
| 作者 | Yang, Xi1,2; Shao, Ming'an1,2,3,4; Li, Tongchuan1,2; Gan, Miao1,2; Chen, Mingyu1,2; Li, Zhiyong1,2 |
| 刊名 | CATENA
 |
| 出版日期 | 2022-11-01 |
| 卷号 | 218页码:10 |
| 关键词 | Soil aggregates Aggregate-associated OC Soil organic carbon Contribution Mechanisms Loess Plateau |
| ISSN号 | 0341-8162 |
| DOI | 10.1016/j.catena.2022.106533 |
| 通讯作者 | Li, Tongchuan(litongchuan_xinong@163.com) |
| 英文摘要 | Soil aggregates are generally thought to be the nucleus of all carbon sequestration mechanisms. However, the Loess Plateau, a typical region where a fragile ecosystem has gradually recovered, has high variability in soil aggregates due to differences in climate and soil properties; thus, the driving mechanism of soil aggregates to changes in soil organic carbon (SOC) content remain unclear. To determine the dominant mechanisms affecting SOC content, we performed a large-scale investigation of the aggregate size fractions, aggregate-associated OC, OC in bulk soil, and environmental factors of the natural grasslands across a climatic gradient (semi-arid to semi-humid) on the Loess Plateau. The results showed that the proportion of macroaggregates (MA) decreased but that of microaggregates (MI) increased in the soil from south to north on the Loess Plateau. MA content decreased with soil depth, whereas MI and the silt + clay fraction (SC) contents increased with soil depth. In addition, aggregate-associated OC decreased with soil depth. The contribution rate of macroaggregate-associated OCwf (MAFC) to OC in bulk soil from south to north in the Loess Plateau showed a trend of decreasing first and then increasing, and the contribution rates were 73.77 % (Fufeng), 62.29 % (Huangling), 32.78 % (Suide), 28.31 % (Shenmu), and 47.62 % (Dalad Banner), respectively. For the entire Loess Plateau, MAFC contributed the most to SOC in different soil layers and the contribution rates were 64.68 % (0-5 cm), 49.54 % (5-10 cm), 44.43 % (10-20 cm), and 37.23 % (20-30 cm), respectively. Across the considered depths and sites, the MA, MAFC, and OC content of MA had significantly (p < 0.05) positive direct effects on the OC in bulk soil. Furthermore, MAFC was mainly dependent on the OC content and proportion of MA. Therefore, these results indicated that the proportion of MA and OC content within MA dominated the OC dynamics in bulk soil in the Loess Plateau. |
| WOS关键词 | AGGREGATE-ASSOCIATED CARBON ; ROBINIA-PSEUDOACACIA FORESTS ; LAND-USE TYPES ; DENSITY FRACTIONS ; SIZE FRACTIONS ; BINDING-AGENTS ; RE-VEGETATION ; BULK-DENSITY ; SILTY SOILS ; PADDY SOIL |
| WOS研究方向 | Geology ; Agriculture ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000874875100003 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/187103]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Li, Tongchuan |
| 作者单位 | 1.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 2.Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 4.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, Xi,Shao, Ming'an,Li, Tongchuan,et al. Soil macroaggregates determine soil organic carbon in the natural grasslands of the Loess Plateau[J]. CATENA,2022,218:10. |
| APA | Yang, Xi,Shao, Ming'an,Li, Tongchuan,Gan, Miao,Chen, Mingyu,&Li, Zhiyong.(2022).Soil macroaggregates determine soil organic carbon in the natural grasslands of the Loess Plateau.CATENA,218,10. |
| MLA | Yang, Xi,et al."Soil macroaggregates determine soil organic carbon in the natural grasslands of the Loess Plateau".CATENA 218(2022):10. |
入库方式： OAI收割
来源：地理科学与资源研究所
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