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| DOI | 10.1007/s42729-024-01734-9 |
| Low Rather Than High Level Nitrogen Additions Accelerate Carbon Release Process and Inhibit Recalcitrant Carbon Allocation via Stirring Soil Enzymatic Activities in Plateau Meadows | |
| 发表日期 | 2024 |
| ISSN | 0718-9508 |
| EISSN | 0718-9516 |
| 英文摘要 | It remains uncertain about the pathway by which atmospheric nitrogen (N) deposition mediates soil carbon (C) source-sink process. This study was initiated to identify the contribution of soil enzymatic activities and nutrient availabilities to C release process (respiration and mineralization), accumulation, and allocation under the N deposition.We established four treatments including control (0 added), low (20 kg N ha-1 yr-1), medium (40 kg N ha-1 yr-1), and high (60 kg N ha-1 yr-1) levels of N additions in meadow wetlands on the Qinghai-Tibet Plateau.We found that the size of soil respiration, C mineralization, and enzymatic activities increased through low-level N additions (17.1-62.5%) and decreased through high-level additions (21.2-52.9%) in contrast to the control. The concentration of recalcitrant organic C (ROC) declined in low-level additions (19.3%) but increased in medium (47.1%) and high (88.6%) additions. Microbial biomass C (MBC) level increased under low (88.1%) and medium (28.6%) additions, while it decreased under high additions (31%). Furthermore, the ratios of LOC/ROC (226.2%) and MBC/ROC (136.4%) increased in low level additions, whereas they decreased in high additions (37.2-63.6%). The contribution of enzymatic activities (59.7-71.2%) to C release and allocation was higher than that of C and N pools (4.7-16.6%).We can conclude that low rather than high level N additions accelerate C release process and reduce recalcitrant C allocation via stirring soil enzymatic activities. The findings are helpful to understand the mechanism of N deposition mediating C source-sink process in alpine meadows. |
| 英文关键词 | Carbon Allocation; Carbon Mineralization; Enzymes; Nitrogen Deposition; Meadow Wetland; Soil Respiration |
| 语种 | 英语 |
| WOS研究方向 | Plant Sciences ; Environmental Sciences & Ecology ; Agriculture |
| WOS类目 | Plant Sciences ; Environmental Sciences ; Soil Science |
| WOS记录号 | WOS:001198607000004 |
| 来源期刊 | JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/303613 |
| 作者单位 | Southwest Forestry University - China; Chinese Academy of Forestry |
| 推荐引用方式 GB/T 7714 | . Low Rather Than High Level Nitrogen Additions Accelerate Carbon Release Process and Inhibit Recalcitrant Carbon Allocation via Stirring Soil Enzymatic Activities in Plateau Meadows[J],2024. |
| APA | (2024).Low Rather Than High Level Nitrogen Additions Accelerate Carbon Release Process and Inhibit Recalcitrant Carbon Allocation via Stirring Soil Enzymatic Activities in Plateau Meadows.JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION. |
| MLA | "Low Rather Than High Level Nitrogen Additions Accelerate Carbon Release Process and Inhibit Recalcitrant Carbon Allocation via Stirring Soil Enzymatic Activities in Plateau Meadows".JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION (2024). |
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