Topography-driven differences in soil N transformation constrain N availability in karst ecosystems
文献类型：期刊论文
| 作者 | Wen, Dongni10,11; Yang, Lin10; Ni, Kang9; Xu, Xingliang8; Yu, Longfei7; Elrys, Ahmed S.11; Meng, Lei11; Zhou, Jinxing6; Zhu, Tongbin1,5,10; Mueller, Christoph2,3,4,5 |
| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
 |
| 出版日期 | 2024-01-15 |
| 卷号 | 908页码:14 |
| ISSN号 | 0048-9697 |
| 关键词 | Karst region Topographic gradient Nitrogen availability Soil microbes Gross N transformation rates |
| DOI | 10.1016/j.scitotenv.2023.168363 |
| 通讯作者 | Zhu, Tongbin(zhutongbin@gmail.com) |
| 英文摘要 | Fragile karst ecosystems are characterized by complex topographic landscapes associated with high variations in vegetation restoration. Identifying the characteristics and driving factors of nitrogen (N) availability across the topographic gradient is essential to guide vegetation restoration in karst regions. In this study, we collected soil samples and plant leaves along the topographic gradient (ridge, upper slope, middle slope, and foot slope) of convex slopes in the karst fault basin of southwest China, and determined the indicators reflecting soil N availability, N transformation rates, and their controlling factors. Our results showed that foliar N content and 615N value, soil inorganic N content and 615N value, and foliar N:P ratio were substantially lower on the steep hillslopes than on the flat top ridge. Steep slope soils also had a lower enzyme C:N ratio but a higher enzyme N:P ratio than the flat ridge soils. Furthermore, the vector angles calculated by soil extracellular enzyme analysis were below 45o in all studied soils and decreased significantly with increasing slope, indicating that microbial growth was generally limited by N. These results jointly suggest the declines in soil N availability across the topographic gradient, which are further explained by the changes in soil inherent N transformation processes. As the slope became steeper, soil mineralization and autotrophic nitrification (ONH4) rates decreased significantly, while ratio of microbial NH4+ immobilization to ONH4 and NH4+ adsorption rate increased significantly, indicating the decrease in soil inorganic N supply capacity. We further found that deteriorated soil structure, decreased soil organic matter and calcium content, altered microbial abundance, and increased ratios of fungi to bacteria and gram-positive bacteria to gram-negative bacteria were the primary drivers of reduced N transformation rates and N availability across the topographic gradient. Overall, this study highlights the critical role of the topography in controlling soil N availability by regulating N transformation processes in karst regions. The topography should be considered an important factor affecting the functions and services of karst ecosystems. |
| WOS关键词 | ENZYME-ACTIVITY ; CARBON ; VEGETATION ; DYNAMICS ; RATIO ; STOICHIOMETRY ; COMMUNITIES ; LIMITATION ; DELTA-N-15 ; INDICATOR |
| 资助项目 | National Natural Science Foun- dation, China[42177243] ; National Natural Science Foun- dation, China[41771340] ; National Natural Science Foundation, China[42177243] ; National Natural Science Foundation, China[41771340] ; Geological Survey Project, China[DD20221808] ; Guangxi Bagui Scholarship Program |
| WOS研究方向 | Environmental Sciences & Ecology |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:001111315200001 |
| 资助机构 | National Natural Science Foun- dation, China ; National Natural Science Foundation, China ; Geological Survey Project, China ; Guangxi Bagui Scholarship Program |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/200207]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Zhu, Tongbin |
| 作者单位 | 1.CAGS, Inst Karst Geol, Karst Dynam Lab, MLR & Guangxi, Guilin 541004, Peoples R China 2.Univ Coll Dublin, Earth Sci Ctr, Dublin, Ireland 3.Univ Coll Dublin, Sch Biol & Environm Sci, Dublin, Ireland 4.Justus Liebig Univ Giessen, Inst Plant Ecol, Heinrich Buff Ring 26, D-35392 Giessen, Germany 5.Justus Liebig Univ, Liebig Ctr Agroecol & Climate Impact Res, Giessen, Germany 6.Beijing Forestry Univ, Sch Soil & Water Conservat, Jianshui Res Stn, Beijing 100083, Peoples R China 7.Tsinghua Univ, Inst Environm & Ecol, Tsinghua Shenzhen Int Grad Sch, Shenzhen 518055, Peoples R China 8.Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 9.Chinese Acad Agr Sci, Tea Res Inst, Hangzhou 310008, Peoples R China 10.Chinese Acad Geol Sci, Key Lab Karst Dynam, MLR & Guangxi, Inst Karst Geol, Guilin 541004, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wen, Dongni,Yang, Lin,Ni, Kang,et al. Topography-driven differences in soil N transformation constrain N availability in karst ecosystems[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2024,908:14. |
| APA | Wen, Dongni.,Yang, Lin.,Ni, Kang.,Xu, Xingliang.,Yu, Longfei.,...&Mueller, Christoph.(2024).Topography-driven differences in soil N transformation constrain N availability in karst ecosystems.SCIENCE OF THE TOTAL ENVIRONMENT,908,14. |
| MLA | Wen, Dongni,et al."Topography-driven differences in soil N transformation constrain N availability in karst ecosystems".SCIENCE OF THE TOTAL ENVIRONMENT 908(2024):14. |
入库方式： OAI收割
来源：地理科学与资源研究所
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