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Spatiotemporal Variations of Throughfall in an Unmanaged Japanese Cypress Plantation Laden with Dead BranchesSpatiotemporal Variations of Throughfall in an Unmanaged Japanese Cypress Plantation Laden with Dead Branches

Other Titles
Spatiotemporal Variations of Throughfall in an Unmanaged Japanese Cypress Plantation Laden with Dead Branches
Authors
정성훈문현식김형호
Issue Date
Dec-2023
Publisher
경상국립대학교 농업생명과학연구원
Keywords
Canopy storage capacity; Chamaecyparis obtusa; Dead branches; Spatial pattern; Temporal stability; Throughfall
Citation
농업생명과학연구, v.57, no.6, pp 63 - 76
Pages
14
Indexed
KCI
Journal Title
농업생명과학연구
Volume
57
Number
6
Start Page
63
End Page
76
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/69369
ISSN
1598-5504
2383-8272
Abstract
Throughfall (TF)—as a diffusive hydrological water flux—significantly affects ecohydrological and biogeochemical processes within forest ecosystems. Recent investigations have revealed the impact on TF generation processes within unmanaged coniferous plantations of under-canopy structures, particularly those laden with dead branches, as well as upper-canopy structures. However, spatiotemporal variations in TF in such plantations remain unexplored. We investigated these variations in TF in a 33-year-old unmanaged Japanese cypress (Chamaecyparis obtusa Endl.) plantation, laden with dead branches, with a high stand density (SD) of 2,500 stems ha−1 . Over a two-year period (May 2017 to May 2019), we conducted weekly TF measurements using 28 manual-type TF collectors. We compared the present TF ratio and canopy water storage capacity (S) with those of previous investigations conducted on Japanese cypress plantations. Moreover, we assessed key indices contributing to spatiotemporal TF variations (canopy cover: CC and distance to the nearest stem: TFd) and potentially influential dead branch indices (number of dead branches: TFdb and vertical spacing length on a stem: TFs) to elucidate TF spatial patterns. The results showed that the TF ratio was notably lower than that in previous studies (n = 13), with SD (r = –0.92, p < 0.001) and S (r = –0.87, p < 0.001) emerging as key influential factors among other stand-structure parameters. Spatial TF patterns exhibited a decreasing trend as the gross rainfall (GR) increased. Temporal stability was not significantly associated with CC (r = 0.120, p = 0.544), TFd (r = 0.068, p = 0.731), TFdb (r = 0.211, p = 0.281), or TFs (r = 0.206, p = 0.292) for any of the TF collectors. These findings underscore the important role of GR in determining the spatial variation of TF. Collectively, our results contribute to an enhanced understanding of TF spatiotemporal heterogeneity in unmanaged Japanese cypress plantations with dead branches.
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농업생명과학대학 (환경산림과학부)
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