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Enzyme Kinetics Affecting Thermal Sensitivity of SOC Decomposition Differ in Hummocks and Hollows of a Permafrost Bog

文献类型：期刊论文

作者Xu, Zhiwei1,2,4; Cai, Jiye1,2,4; Wang, Yuting1,2,4; Pan, Junxiao3; Wang, Zucheng1,2,4; Dong, Yanmin1,2,4; Li, Hongkai1,2,4; Liu, Shasha1,2,4; Liu, Ziping1,2,4; Wang, Shengzhong1,2,4
刊名EUROPEAN JOURNAL OF SOIL SCIENCE
出版日期2025-08-09
卷号76期号:4页码:e70173
关键词carbon decomposition carbon quality enzyme kinetics hummock-hollow temperature sensitivity
ISSN号1351-0754
DOI10.1111/ejss.70173
产权排序4
文献子类Article
英文摘要Northern peatlands are important pools of soil organic carbon (SOC) and show a fine-scale feature of hummocks and hollows. However, there remains uncertainty about the magnitude of SOC-climate feedbacks because of the knowledge gap about the fine-scale spatial pattern and temperature sensitivity (Q10) mechanism of SOC decomposition. We collected peatland soils from the Greater Khingan Mountains in Northeastern China to investigate how soil enzyme kinetics control the hummock-hollow pattern of the Q10 of SOC decomposition. Results revealed that soil enzyme kinetic parameters (maximum reaction velocity [Vmax] and Michaelis constant [Km]) were greater in hollows compared to hummocks. In the 0-15 cm depth, the catalytic efficiencies (Kcat) of beta-1,4-glucosidase (BG) and acid phosphatase (AP) were greater in hollows than in hummocks, but the Kcat of 4-N-acetylglucosaminidase (NAG) was reversed. In the 15-30 cm depth, the Kcat of NAG and AP was greater in hollows than in hummocks, but the Kcat of BG was reversed. Except for the Km of NAG, all enzyme kinetic parameters increased with rising temperature. The Q10 values of Vmax and Km were greater in hummocks than in hollows, with Q10 values of Vmax ranging from 1.48 to 2.22 and from 1.12 to 2.12 for hummocks and hollows, respectively. Similarly, the Q10 values of Km ranged from 0.70 to 1.67 and from 0.55 to 1.50 for hummocks and hollows, respectively. A positive correlation was observed between Vmax and Km, indicating that increases in Km may counterbalance increases in Vmax as temperature rises. The Q10 values for SOC decomposition were greater in hummocks than in hollows, with average Q10 values of 3.5 and 1.5 when temperature increased from 5 degrees C to 15 degrees C, respectively. Soil TP and the Q10-Vmax of NAG and AP have emerged as the best predictors of Q10 values for SOC decomposition, and they were positively correlated with the Q10 values for SOC decomposition. The larger phosphorus content and the high temperature sensitivity of hydrolase activities on hummocks suggest they would have a high potential for carbon mineralisation in the background of climate warming. These findings suggest that soil enzyme kinetic parameters and their Q10 provide valuable tools for predicting the response of microbially mediated SOC decomposition to climate warming scenarios.
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WOS关键词SOIL ORGANIC-MATTER ; TEMPERATURE SENSITIVITY ; CARBON DECOMPOSITION ; PEATLAND ; CHINA ; MICROTOPOGRAPHY ; RESPIRATION ; PARAMETERS ; VEGETATION ; INCREASES
WOS研究方向Agriculture
语种英语
WOS记录号WOS:001547889800001
出版者WILEY
源URL[http://ir.igsnrr.ac.cn/handle/311030/215558]  
专题生态系统网络观测与模拟院重点实验室_外文论文
通讯作者Li, Hongkai
作者单位1.Northeast Normal Univ, Inst Peat & Mire Res, Jilin Prov Key Lab Wetland Ecol Proc & Environm Ch, Changchun, Peoples R China;
2.Northeast Normal Univ, State Environm Protect Key Lab Wetland Ecol & Vege, Changchun, Peoples R China;
3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China
4.Northeast Normal Univ, Sch Geog Sci, Key Lab Geog Proc & Ecol Secur Changbai Mt, Minist Educ, Changchun, Peoples R China;
推荐引用方式
GB/T 7714		 Xu, Zhiwei,Cai, Jiye,Wang, Yuting,et al. Enzyme Kinetics Affecting Thermal Sensitivity of SOC Decomposition Differ in Hummocks and Hollows of a Permafrost Bog[J]. EUROPEAN JOURNAL OF SOIL SCIENCE,2025,76(4):e70173.
APA Xu, Zhiwei.,Cai, Jiye.,Wang, Yuting.,Pan, Junxiao.,Wang, Zucheng.,...&Wang, Shengzhong.(2025).Enzyme Kinetics Affecting Thermal Sensitivity of SOC Decomposition Differ in Hummocks and Hollows of a Permafrost Bog.EUROPEAN JOURNAL OF SOIL SCIENCE,76(4),e70173.
MLA Xu, Zhiwei,et al."Enzyme Kinetics Affecting Thermal Sensitivity of SOC Decomposition Differ in Hummocks and Hollows of a Permafrost Bog".EUROPEAN JOURNAL OF SOIL SCIENCE 76.4(2025):e70173.

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来源：地理科学与资源研究所

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