作 者： Hu SY, Wang CH, He NP, Li A, Wang YL, Han XG, Huang JH*
期刊名称： JGR-Biogeosciences
影响因子： 3.7
出版年份： 2025
卷 期 号： 13( 3)
页 码： e2024JG008672
论文摘要：
Soil net nitrogen (N) mineralization potential (Rmin) is a key indicator for predicting the capacity of available N supply for plant growth and ecosystem productivity. Thus, it is crucial to understand the spatial pattern and regulatory mechanisms of forest Rmin and its temperature sensitivity (Q10) under current global change scenarios. In this study, we determined the Rmin and its Q10 value of soil samples collected from 18 forest ecosystems along a 5200-km-long north-south forest transect in eastern China. We found significant differences in Rmin and its Q10 values among different forest types. Tropical and subtropical forests had significantly higher Rmin values than temperate forests and cold temperate forests. In contrast, tropical and subtropical forests had the lowest Q10 values followed by temperate forests and cold temperate forests. Rmin varied with mean annual precipitation, soil total carbon (C) and N, microbial biomass carbon (MBC) and the MBC to the microbial biomass nitrogen (MBN) ratio. The Q10 value varied with the mean annual temperature (MAT), the MBC/MBN ratio, and aridity index. Overall, our results indicate that the Q10 value of the Rmin is generally lower in warmer or wetter areas than in colder or drier areas along the north-south forest transect in eastern China. Our results imply that the predicted global change may narrow the gaps in the Rmin between high- and low-latitude forests or among forests with different humidity levels.
原文链接：https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024JG008672