Distribution characteristics and controls of soil organic carbon at different spatial scales in China ' s Loess Plateau
文献类型：期刊论文
| 作者 | Wang, Yi1,3; Huang, Laiming1,2,3; Jia, Xiaoxu1,2,3; Zhu, Yuanjun2; Shao, Ming'an1,2,3 |
| 刊名 | JOURNAL OF ENVIRONMENTAL MANAGEMENT
 |
| 出版日期 | 2021-09-01 |
| 卷号 | 293页码:12 |
| 关键词 | Loess critical zone Soil organic carbon Spatial distribution Scale extrapolation Pedotransfer functions |
| ISSN号 | 0301-4797 |
| DOI | 10.1016/j.jenvman.2021.112943 |
| 通讯作者 | Huang, Laiming(huanglm@igsnrr.ac.cn) |
| 英文摘要 | Understanding the variations and controls of soil organic carbon (SOC) at different spatial scales can help in selecting edaphic and environmental covariates that enables us to model SOC more accurately. The present study investigated the distribution characteristics and controls of SOC content at various spatial scales, including a deep soil core (204.5 m) taken from land surface down to bedrock (plot scale), two toposequences with different slope aspects (slope scale), and eighty-six soil profiles along a north-south transect under different land uses (regional scale) in China's Loess Plateau. The results showed that SOC content at different spatial scales decreased exponentially with increasing soil depth, but the rate of reduction differed at various spatial scales and in soil layers at different depths. For the deep soil core, the SOC content and the average rate of reduction with depth in the 0-15.5 m soil layer were significantly higher than the corresponding values of the 15.5-34.5 m and 34.5-204.5 m soil layers (p 0.05). For the toposequences with varying slope aspects, SOC content in the 0-50 cm soil layer declined rapidly with increasing depth; while SOC content in the 50-200 cm soil layer showed relatively no change. There was no significant difference of average SOC content at depths of 0-200 cm for forestland and grassland considering slope aspects that differed or were the same (p 0.05), following the order of farmland (4.94 +/- 1.23 g kg- 1) forestland (3.01 +/- 1.45 g kg- 1) > grassland (2.03 +/- 0.68 g kg- 1); moreover, the mean SOC content of the 0-500 cm soil profile generally decreased from south to north following the decreasing rainfall and temperature gradient. The average rates of reduction of SOC content in the 0-50 cm soil layer under different land uses (0.0807-0.1756 g kg- 1 cm- 1) were higher than the values of the 50-200 cm (0.0021-0.0154 g kg- 1 cm- 1) and 200-500 cm soil layers (0.0001-0.0017 g kg- 1 cm-). The SOC content at the plot scale at different depths positively correlated with total nitrogen content. The SOC content at the slope scale was mainly affected by soil water content and saturated hydraulic conductivity, while that at the regional scale was impacted by climate, topography and soil water/clay content. Pedotransfer functions were applied to adequately simulate and predict SOC content at different spatial scales in the studied area, which could provide a foundation to build SOC prediction models and extrapolate the various spatial scales to other loess regions worldwide. Our findings demonstrate the importance of considering the scale effects for efficiently predicting the spatial patterns of SOC and can help in devising better policy to protect or enhance existing SOC stocks. |
| WOS关键词 | LAND-USE ; INORGANIC CARBON ; VERTICAL-DISTRIBUTION ; CLIMATE-CHANGE ; PEDOTRANSFER FUNCTION ; HYDRAULIC-PROPERTIES ; BULK-DENSITY ; DEEP SOILS ; STOCKS ; SEQUESTRATION |
| 资助项目 | National Natural Science Foundation of China[41977004] ; National Natural Science Foundation of China[41601221] ; Second Tibetan Plateau Scientific Expedition and Research (STEP) Program[2019QZKK0306] ; Ministry of Science and Technology of China[2016YFC0501605] ; Chinese Academy of Sciences[XDA23070202] ; Youth Innovation Promotion Association of Chinese Academy of Sciences[2019052] ; Bingwei Outstanding Young Talent Project from the Institute of Geographical Sciences and Natural Resources Research[2017RC203] |
| WOS研究方向 | Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:000677854000007 |
| 出版者 | ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD |
| 资助机构 | National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) Program ; Ministry of Science and Technology of China ; Chinese Academy of Sciences ; Youth Innovation Promotion Association of Chinese Academy of Sciences ; Bingwei Outstanding Young Talent Project from the Institute of Geographical Sciences and Natural Resources Research |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/164785]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Huang, Laiming |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 2.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Yi,Huang, Laiming,Jia, Xiaoxu,et al. Distribution characteristics and controls of soil organic carbon at different spatial scales in China ' s Loess Plateau[J]. JOURNAL OF ENVIRONMENTAL MANAGEMENT,2021,293:12. |
| APA | Wang, Yi,Huang, Laiming,Jia, Xiaoxu,Zhu, Yuanjun,&Shao, Ming'an.(2021).Distribution characteristics and controls of soil organic carbon at different spatial scales in China ' s Loess Plateau.JOURNAL OF ENVIRONMENTAL MANAGEMENT,293,12. |
| MLA | Wang, Yi,et al."Distribution characteristics and controls of soil organic carbon at different spatial scales in China ' s Loess Plateau".JOURNAL OF ENVIRONMENTAL MANAGEMENT 293(2021):12. |
入库方式： OAI收割
来源：地理科学与资源研究所
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