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Nitrogen Input Increases Deyeuxia angustifolia Litter Decomposition and Enzyme Activities in a Marshland Ecosystem in Sanjiang Plain, Northeast China

Author:
Song, Yan-Yu, Song, Chang-Chun, Ren, Jiu-Sheng, Zhang, Xin-Hou, Jiang, Lei
Source:
Wetlands 2019 v.39 no.3 pp. 549-557
ISSN:
0277-5212
Subject:
Calamagrostis, acid phosphatase, beta-fructofuranosidase, beta-glucosidase, carbon, carbon nitrogen ratio, catechol oxidase, ecosystems, enzyme activity, half life, marshes, metabolism, nitrogen, nitrogen content, nitrogen cycle, phosphorus, urease, China
Abstract:
Litter decomposition is an important process involved in carbon (C) and nitrogen (N) cycling in ecosystems. However, the biochemical mechanism underlying the response of litter decomposition to N input in marshland remains unclear. Mass loss, C and N dynamics, and enzymatic activity of Deyeuxia angustifolia litter during decomposition in a marshland were evaluated under different levels of N input (N0, control; N1, 12 g N m⁻² year⁻¹; N2, 24 g N m⁻² year⁻¹). Results revealed that N input accelerated D. angustifolia litter decomposition. By the end of the experiment, mass loss increased by 5.0%, and 8.7% under N1 and N2 treatments, respectively. The half-lives of dry-matter decomposition under the N0, N1, and N2 treatment were 2.59, 2.27, and 1.77 years, respectively. N input increased litter N concentration and decreased C/N ratio. Moreover, under N input, invertase, β-glucosidase, and acid phosphatase activities were stimulated during the litter decomposition process, whereas urease and polyphenol oxidase activities were stimulated during the later stage of litter decomposition. Results suggested that N input promotes D. angustifolia litter decomposition by stimulating activities of enzymes related to C, N and phosphorus metabolism and N input profoundly changes C and N cycling in marshland ecosystems.
Agid:
6489508