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Glob Chang Biol. 2014 Oct;20(10):3222-8. doi: 10.1111/gcb.12555. Epub 2014 May 2.

Different types of nitrogen deposition show variable effects on the soil carbon cycle process of temperate forests.

Author information

1
Hebei College of Industry and Technology, Hongqi Street 626, Shijiazhuang, 050091, China.

Abstract

Nitrogen (N) deposition significantly affects the soil carbon (C) cycle process of forests. However, the influence of different types of N on it still remained unclear. In this work, ammonium nitrate was selected as an inorganic N (IN) source, while urea and glycine were chosen as organic N (ON) sources. Different ratios of IN to ON (1 : 4, 2 : 3, 3 : 2, 4 : 1, and 5 : 0) were mixed with equal total amounts and then used to fertilize temperate forest soils for 2 years. Results showed that IN deposition inhibited soil C cycle processes, such as soil respiration, soil organic C decomposition, and enzymatic activities, and induced the accumulation of recalcitrant organic C. By contrast, ON deposition promoted these processes. Addition of ON also resulted in accelerated transformation of recalcitrant compounds into labile compounds and increased CO2 efflux. Meanwhile, greater ON deposition may convert C sequestration in forest soils into C source. These results indicated the importance of the IN to ON ratio in controlling the soil C cycle, which can consequently change the ecological effect of N deposition.

KEYWORDS:

carbon cycle; enzymatic activity; forest soil; inorganic nitrogen; litter decomposition; nitrogen deposition; organic nitrogen; soil respiration

PMID:
24615991
DOI:
10.1111/gcb.12555
[Indexed for MEDLINE]
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