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Forests 2017, 8(6), 214; doi:10.3390/f8060214

Carbon and Nitrogen Accumulation and Decomposition from Coarse Woody Debris in a Naturally Regenerated Korean Red Pine (Pinus densiflora S. et Z.) Forest

1
School of Forest Resources and Environmental Science, Michigan Technological University, Houghton, MI 49931, USA
2
Environmental Policy Research Group, Korea Environment Institute, Sejong 30147, Korea
3
National Institute of Forest Science, Seoul 02455, Korea
4
Department of Forest Resources, Gyeongnam National University of Science and Technology, Jinju 52725, Korea
5
Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, Korea
6
Department of Biological and Environmental Sciences, Qatar University, Doha 2713, Qatar
*
Author to whom correspondence should be addressed.
Academic Editor: Timothy A. Martin
Received: 13 April 2017 / Revised: 6 June 2017 / Accepted: 13 June 2017 / Published: 16 June 2017
(This article belongs to the Special Issue Coarse Woody Debris of Forests in a Changing World)
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Abstract

The contribution of coarse woody debris (CWD) to forest carbon (C) and nitrogen (N) dynamics is poorly quantified. This study quantified total C and N content in CWD and estimated the decomposition rates of CWD at different decay stages in a 70-year-old naturally regenerated Korean red pine forest (Pinus densiflora S. et Z.). The N concentration in CWD varied among species and decay classes (from 0.15% to 0.82%), and exhibited a decreasing pattern in C:N ratios with increasing decay class. Total CWD amounts of 4.84 Mg C ha−1, dominated by pine logs (45.4%) and decay class III (40.0%), contained total N of 20.48 kg N ha−1, which was approximately nine times the N input from annual tree mortality. In addition, this study demonstrated that the decay constant rate k was 0.2497 for needle litter, whereas k values were 0.0438, 0.0693, 0.1054, and 0.1947 for red pine CWD of decay class I, II, III, and IV, respectively. The decay rates were significantly related to wood density, N concentration, and C:N ratio across the decay classes of CWD. The results suggest that the C:N ratio of CWD is a key factor affecting its decomposition. View Full-Text
Keywords: C:N ratio; decay class; decay rate; downed dead wood; litter component; natural forest; red pine forest; wood density C:N ratio; decay class; decay rate; downed dead wood; litter component; natural forest; red pine forest; wood density
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MDPI and ACS Style

Noh, N.J.; Yoon, T.K.; Kim, R.-H.; Bolton, N.W.; Kim, C.; Son, Y. Carbon and Nitrogen Accumulation and Decomposition from Coarse Woody Debris in a Naturally Regenerated Korean Red Pine (Pinus densiflora S. et Z.) Forest. Forests 2017, 8, 214.

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