气候变化领域集成服务门户(CCPortal): Low Rather Than High Level Nitrogen Additions Accelerate Carbon Release Process and Inhibit Recalcitrant Carbon Allocation via Stirring Soil Enzymatic Activities in Plateau Meadows

CCPortal

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
	Lu, Mei; Wang, Mingliu; Sun, Yujia; Sun, Guanfa; Zhao, Dingrong; San, Shengyang; Li, Cong; Liu, Guoqing; Guo, Chuniao; Zhao, Xuyan; Chen, Zhimin
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
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/303614
作者单位	Southwest Forestry University - China; Chinese Academy of Forestry
推荐引用方式 GB/T 7714	Lu, Mei,Wang, Mingliu,Sun, Yujia,et al. 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	Lu, Mei.,Wang, Mingliu.,Sun, Yujia.,Sun, Guanfa.,Zhao, Dingrong.,...&Chen, Zhimin.(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	Lu, Mei,et al."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).