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http://dx.doi.org/10.14578/jkfs.2021.110.1.43

Carbon and Nitrogen Inputs by Litterfall of Chamaecyparis obtusa Planted in Pine Wilt Disease-disturbed Forests  

Kang, Hyeon Cheol (Department of Forest Resources, Gyeongsang National University)
Baek, Gyeongwon (Department of Forest Resources, Gyeongsang National University)
Choi, Byeonggil (Department of Forest Resources, Gyeongsang National University)
Ha, Jiseok (Department of Forest Resources, Gyeongsang National University)
Kim, Choonsig (Department of Forest Resources, Gyeongsang National University)
Publication Information
Journal of Korean Society of Forest Science / v.110, no.1, 2021 , pp. 43-52 More about this Journal
Abstract
In this study, carbon (C) and nitrogen (N) inputs by the litterfall of Japanese cypress (Chamaecyparis obtusa Endlicher) planted in pine wilt disease-disturbed forests were determined. The study sites were located in Sacheon-si, Gyeongsangnam-do. Eight plots under two regeneration sites (DR: four plots of C. obtusa planted under slightly disturbed Pinus thunbergii stands; CR: four plots of C. obtusa planted following the clear-cutting of severely disturbed pine stands) were established to collect litterfall from December 2018 to December 2019. The growth of diameter at breast height (DBH) was significantly higher in the CR treatment (12.10 cm) than that in the DR treatment (9.42 cm). C and N concentrations and the C/N ratio in C. obtusa leaf litter did not differ significantly between the two regeneration treatments, but the C/N ratio was significantly lower in the leaf litter collected in October (93) relative to that collected in December (143). The C concentration of litterfall components was significantly higher in C. obtusa leaf litter and in P. thunbergii needle litter than in broadleaved and miscellaneous litter, whereas the N concentration in broadleaved and miscellaneous litter was significantly higher than that in the leaf litter of C. obtusa and in branch litter. Thus, the C/N ratio was significantly higher in C. obtusa leaf litter and branch litter compared with that in miscellaneous and broadleaved litter. Respective C and N inputs by leaf litter were 773 kg C ha-1 yr-1 and 6.95 kg N ha-1 yr-1 for the CR treatments, and 78 kg C ha-1 yr-1 and 0.70 kg N ha-1 yr-1 for the DR treatment. Total C and N inputs were higher for the DR treatment (3,765 kg C ha-1 yr-1 and 47.6 kg N ha-1 yr-1, respectively) than for the CR treatment (1,290 kg C ha-1 yr-1 and 17.2 kg N ha-1 yr-1, respectively). These results indicate that, for C. obtusa, the DBH growth in the CR treatment was superior to that in the DR treatment, but the C and N inputs by litterfall were considerably reduced in CR treatments.
Keywords
carbon; double-layer forest regeneration; Japanese cypress; litterfall; nitrogen; pine wilt disease;
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