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http://dx.doi.org/10.5532/KJAFM.2021.23.2.89

Comparisons of Decomposition Rates, Carbon and Nitrogen Dynamics of Branches in Pinus densiflora and Quercus variabilis Stands  

Choi, Byeonggil (Department of Forest Resources, Gyeongsang National University)
Baek, Gyeongwon (Department of Forest Resources, Gyeongsang National University)
Kim, Hyungsub (Division of Environmental Science and Ecological Engineering, Korea University)
Son, Yowhan (Division of Environmental Science and Ecological Engineering, Korea University)
Kim, Choonsig (Department of Forest Resources, Gyeongsang National University)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.23, no.2, 2021 , pp. 89-99 More about this Journal
Abstract
This study was carried out to understand how factors of decomposition such as quality of the substrate (tree species), forest types, and soil·meteorological conditions affect decomposition rates and dynamics of carbon (C) and nitrogen (N) of branches in adjacent Pinus densiflora and Quercus variabilis stands in Sancheong and J inju in Southern Korea. The branch bags (30 cm × 30 cm) with branch samples (a diameter of 2.0 - 4.0 cm and length of 10 cm) were placed on the forest floor at each stand in May 2018. The branch bags were collected in August and November 2018, February and May 2019, respectively. The decomposition rates of branches in P. densiflora stands were 4.49 % for Sancheong, and 5.75 % for Jinju. Whereas, the decomposition rates in Q. variabilis were 20.01 % for Sancheong, and 24.68 % for Jinju, respectively. The decomposition of branches was more rapid in Q. variabilis compared with P. densiflora in both regions. C and N in decomposed branches were more mineralized in Q. variabilis, whereas C and N were more accumulated in P. densiflora. These results indicated that the decomposition rates, C and N of decomposed branches may be affected by differences in substrate quality such as initial N concentration and C/N ratio rather than differences between both regions including different environmental factors.
Keywords
Carbon; Nitrogen; C/N ratio; Decomposition rate; Mineralization; Quercus variabilis; Pinus densiflora;
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