The quality and quantity of SOM determines the mineralization of recently added labile C and priming of native SOM in grazed grasslands
文献类型：期刊论文
| 作者 | Li, Chao; Xiao, Chunwang; Li, Mingxu1; Xu, Li1; He, Nianpeng1,2,3 |
| 刊名 | GEODERMA
 |
| 出版日期 | 2023-04-01 |
| 卷号 | 432页码:116385 |
| 关键词 | C N ratio SOM quantity Priming effect Grazing exclusion Soil depth Soil C balance |
| DOI | 10.1016/j.geoderma.2023.116385 |
| 文献子类 | Article |
| 英文摘要 | Continuous and pulsed inputs of labile organic carbon (LOC) into soil are common. However, because soil mi-crobial responses to LOC input are rapid, the relative contributions of respiration derived from LOC to total microbial respiration and their influencing factors remain elusive. Furthermore, although numerous studies have explored the priming effect (PE) of soil organic matter (SOM) mineralization induced by LOC addition, few studies have focused on its short-term effects. There are some indications that the response of soil microbes to LOC input depends on the microbial demand of nutrients, especially C and N. Therefore, variations in soil C and N characteristics may further influence microbial response processes to LOC inputs and the decomposition of LOC and SOM, but a comprehensive understanding of this is lacking. To address this gap, 13C-labeled glucose was added to six temperate grassland soils with different C/N ratios (9.98-12.0), which were collected from areas with different grazing exclusion durations and at different soil depths. The microbial respiration was measured at 9-min intervals across a 105-h period. We found that soil microbes responded rapidly to LOC input, and mi-crobial biomass controlled by soil organic C (SOC) and C/N was the most important factor directly influencing the intensity of the microbial response to LOC input. Grazing and deeper soil layers decreased the respiration derived from LOC and their relative contribution to total respiration, mainly attributed to variations in soil C/N and fungal/bacterial ratio (Fu/Ba). LOC addition stimulated SOM decomposition in all soils and increased respiration of SOM by 11.3-92.4 mg C/g SOC, equivalent to 18.7-266.1 % priming. Grazing and increased soil depth resulted in a greater PE and soil C loss, with soil C/N and SOC content being the most important regulators. Overall, this study revealed the important influence of LOC on soil C fluxes and highlighted the important role of SOM quality and quantity in regulating grassland soil C cycling. |
| WOS关键词 | SUBSTRATE-INDUCED RESPIRATION ; SOIL MICROBIAL BIOMASS ; CARBON INPUTS ; DECOMPOSITION ; CHALLENGES ; INCREASES ; DYNAMICS ; ROOT |
| WOS研究方向 | Agriculture |
| WOS记录号 | WOS:000965765400001 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/200822]  |
| 专题 | 生态系统网络观测与模拟院重点实验室_外文论文 |
| 作者单位 | 1.Minzu Univ China, Coll Life & Environm Sci, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China 3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China 4.Northeast Forestry Univ, Ctr Ecol Res, Harbin, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Chao,Xiao, Chunwang,Li, Mingxu,et al. The quality and quantity of SOM determines the mineralization of recently added labile C and priming of native SOM in grazed grasslands[J]. GEODERMA,2023,432:116385. |
| APA | Li, Chao,Xiao, Chunwang,Li, Mingxu,Xu, Li,&He, Nianpeng.(2023).The quality and quantity of SOM determines the mineralization of recently added labile C and priming of native SOM in grazed grasslands.GEODERMA,432,116385. |
| MLA | Li, Chao,et al."The quality and quantity of SOM determines the mineralization of recently added labile C and priming of native SOM in grazed grasslands".GEODERMA 432(2023):116385. |
入库方式： OAI收割
来源：地理科学与资源研究所
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