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Interactive effects of elevated UV-B radiation and N deposition on decomposition of Moso bamboo litter

Articles

Journal/Conference:

SOIL BIOLOGY & BIOCHEMISTRY

Language:

English

Author:

Zhang Zhiting; Zhang Shuikui

Experts:

Song Xinzhang; Jiang Hong; Zhou Guomo; Peng Changhui

Year:

2014

Volume:

69

Pages:

11-16

Keywords:

Environmental change; Combination; Carbon cycle; Nutrient release; Photodegradation; Phyllostachys pubescens

Being two important agents of global environmental change, elevated ultraviolet-B (UV-B) radiation derived from anthropogenic driven ozone depletion and enhanced nitrogen (N) deposition may strongly affect litter decomposition, a crucial factor in biogeochemical cycling. However, the interactive effects of both agents together on litter decomposition are still unclear even though each has been well-documented independently. We conducted a field-based experiment in subtropical China to investigate the combined effects UV-B radiation and N deposition on the decomposition of Moso bamboo (Phyllostachys pubescens) leaf litter over a 20 months period. It was found that the combined effect significantly accelerated litter decomposition, C loss, and lignin degradation as well as facilitating phosphorous (P) release, although it had no measurable effect on N release. Moreover, the interactive effects of both agents together far exceeded the effects of each separately. Results indicated that the positive combined effect of UV-B radiation and N deposition on litter decomposition and C loss could potentially impact Moso bamboo forest ecosystem C cycling. These findings provide a new perspective to further understand the interactive effects of global environmental changes on terrestrial ecosystem processes. (C) 2013 Elsevier Ltd. All rights reserved.