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	Response of carbon utilization and enzymatic activities to nitrogen deposition in three forests of subtropical China
	Wang Y. S.; Cheng, S. L.; Yu, G. R.; Fang, H. J.; Mo, J. M.; Xu, M. J.; Gao, W. L.
	2015
关键词	N deposition subtropical forest stand carbon utilization enzyme activities soil pH simulated n deposition atmospheric nitrate deposition northern hardwood forests southern china litter decomposition microbial communities soil respiration tropical forests mature forests dynamics
英文摘要	Nitrogen (N) deposition has been shown to affect soil carbon (C) and N cycling in subtropical forests; however, the underlying microbial mechanisms are poorly understood. We used patterns of community-level physiological profiles and enzyme activities to assess the relative effects of the addition of four N levels (0, 50, 100, and 150 kg.ha(-1.)year(-1)) on the soil microbial community in three forest stands (pine, mixed, and broadleaf forests) in southern China, where the forests have been experimentally manipulated for over 8 years. In pine forests, N50 addition significantly increased microbial biomass carbon (MBC) concentration but decreased soil pH levels. N100 addition significantly increased soil peroxidase activity but decreased soil beta-1,4-glucosidase activity. In broadleaf forests, N addition increased soil dissolved organic carbon (DOC) concentration and polyphenol oxidase activity but decreased soil MBC concentration and soil pH levels. N addition also significantly increased soil microbial metabolism activity (expressed as average well color development) in pine forest and broadleaf forest soils. However, the mixed forests responded slowly to N additions and exhibited no significant response of C-utilization profiles and soil enzyme activities. Principal component analysis of C-utilization data separated microbial communities with respect to N addition and forest successional stage. In addition, microbial C utilization was driven by soil pH levels. Although enzyme activities were correlated with soil MBC and microbial biomass nitrogen concentrations, stepwise regression results indicated that soil total carbon contents that were integrated with soil pH levels were key integrators of soil enzyme activities. Our results suggest that soil acidification due to N addition increased soil bacterial C utilization and enzyme activities.
出处	Canadian Journal of Forest Research
卷	45
期	4
页	394-401
收录类别	SCI
语种	英语
ISSN号	0045-5067
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/38500]
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	Wang Y. S.,Cheng, S. L.,Yu, G. R.,et al. Response of carbon utilization and enzymatic activities to nitrogen deposition in three forests of subtropical China. 2015.

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