We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Effect of chronic nitrogen fertilization on soil CO flux in a temperate forest in North China: a 5-year nitrogen addition experiment.
- Authors
Wang, Chunmei; Yang, Xintong; Xu, Ke
- Abstract
Purpose: Mounting evidence has indicated that there was dramatic increase in atmospheric nitrogen (N) deposition. The objectives of this study were to characterize how soil carbon dioxide (CO) flux responds to different forms and levels of N addition in 5 years. We hope to provide further understanding and detailed information of the impact of N addition on CO flux in temperate forests in North China. Materials and methods: A 5-year field experiment was conducted at the Xi Mountain Research Station of Beijing Forestry University, northern China, from 2011 to 2016. Multiple levels and forms of N addition experiment included control with no N added, NHNO, NaNO, and (NH)SO at two levels (low N (L) 50 kg N ha year and high N (H) 150 kg N ha year). Additional N was administered equally once per month during the growing season (March to October), and CO flux was measured three times every month. Soil temperature, water-filled pore space, and NO -N and NH -N concentrations were measured monthly to determine the relationships between CO flux and soil physicochemical variables. Results and discussion: Cumulative CO flux increased by more than 50% under all high-level N addition and by 27% under L-NHNO addition, while other N additions had no significant effect. H-NaNO and H-NHNO exerted stronger effects on cumulative CO flux in initial years, especially the second year when maximum increases were 99 and 129%, respectively. Increasing inorganic N concentration could change soil from N-limited to N-rich, and then N-saturated, and so the promotion increased and then decreased. The effect of high-level N addition was stronger than that of low-level, and exhibited a general order: NHNO > (NH)SO. Considering the amount and decrease in NH -N/NO -N in local actual N deposition, there might be an increase in soil CO flux in our study area in the future. Conclusions: The performance of N addition on cumulative CO flux depended on N forms and levels. If the experimental period had been less than 3 years, the effect of N addition on temperate forest soil would be overestimated. Our findings highlighted the importance of experimental time and multiple forms and levels of N addition with regard to the response of soil CO flux to N deposition.
- Subjects
NITROGEN fertilizers &; the environment; FOREST soils; SOIL composition; CARBON dioxide
- Publication
Journal of Soils & Sediments: Protection, Risk Assessment, & Remediation, 2018, Vol 18, Issue 2, p506
- ISSN
1439-0108
- Publication type
Article
- DOI
10.1007/s11368-017-1760-y