Enhanced deposition of nitrate alters microbial cycling of N in a subtropical forest soil | |
Gao W. L.; Kou, L.; Zhang, J. B.; Muller, C.; Wang, H. M.; Yang, H.; Li, S. G. | |
2016 | |
关键词 | N deposition Gross N transformations N-15 tracing Model Subtropical forest nitrogen deposition heterotrophic nitrification terrestrial ecosystems retention processes enzyme-activities tropical forest grassland soil boreal forest carbon plant |
英文摘要 | In China, atmospheric deposition of NO3 (-) is increasing rapidly. However, information on how microbial N cycling in forest soils may respond to increasing deposition of NO3 (-) is currently lacking. Determination of process- and pool-specific N transformation rates can provide additional insights into the controls on the production and consumption of inorganic N, and microbial function. Here, we present results from a laboratory N-15 tracing study with a soil (0-10 cm) from a subtropical forest receiving fertilization for more than 2.5 years at a rate of 0, 40, and 120 kg NO3 (-)-N ha(-1) year(-1). The process- and pool-specific N transformation rates were quantified with a N-15 tracing model. The directions of changes in microbial mineralization of labile and recalcitrant organic N were opposite under increased NO3 (-) additions. Microbial mineralization of labile organic N first decreased, then increased, while microbial mineralization of recalcitrant organic N showed the opposite in response to increasing NO3 (-) additions. Ammonium immobilization into labile and recalcitrant organic N was not changed by increased NO3 (-) additions. Nitrate additions did not affect heterotrophic and gross nitrification, but stimulated autotrophic nitrification. Nitrate immobilization decreased under increased NO3 (-) additions, with a greater reduction under low NO3 (-) addition treatment compared to high NO3 (-) addition treatment. Overall, our results reflect a contrasting change in microbial mineralization of liable and recalcitrant organic N under increased NO3 (-) additions, and a contrasting effect of low and high NO3 (-) additions on microbial mineralization of liable and recalcitrant organic N. It also has implications for our understanding of NO3 (-) deposition-induced nonlinear changes in net production and loss of NO3 (-) in subtropical/tropical forest soils. |
出处 | Biology and Fertility of Soils |
卷 | 52 |
期 | 7 |
页 | 977-986 |
语种 | 英语 |
ISSN号 | 0178-2762 |
DOI标识 | 10.1007/s00374-016-1134-4 |
内容类型 | SCI/SSCI论文 |
源URL | [http://ir.igsnrr.ac.cn/handle/311030/42947] |
专题 | 地理科学与资源研究所_历年回溯文献 |
推荐引用方式 GB/T 7714 | Gao W. L.,Kou, L.,Zhang, J. B.,et al. Enhanced deposition of nitrate alters microbial cycling of N in a subtropical forest soil. 2016. |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论