When and why do trees begin to decrease their resource allocation to apical growth? The importance of the reproductive onset

Maki Suzuki , Kiyoshi Umeki , Olga Orman , Mitsue Shibata , Hiroshi Tanaka , Shigeo Iida , Tohru Nakashizuka , Takashi Masaki


Trees reduce their allocation to apical growth compared with that to radial growth during later life stages. This has often been attributed to hydraulic and mechanical limitations; however, a growth–reproduction tradeof might also play an important role. To test whether the height–diameter (H–D) relationship in trees changes with the timing of the onset of reproduction, we analyzed the H–D relationship of 13 deciduous broad-leaved tree species in a Japanese old-growth temperate forest using linear and segmented-linear regression models. These models showed a better ft than common continuous models (simple allometry and saturating curve). For 11 out of 13 species having break points on the H–D lines, we assessed whether the height at the breakpoint (BPH) was related to the height at the onset of reproduction determined by multiyear observatory records on several trees. Although BPH estimates for these 11 species were highly variable, most were within 3.1 m of the stable fowering height (staFLH), or the height at which trees achieve the ability to fower regardless of their growth conditions. The interspecies mean value of the diference between staFLH and BPH was only 45 cm, which suggested a causal relationship between these parameters. BPHs of nine out of 11 species were within the canopy layer and, for the two remaining species, were within the subcanopy layer. These results suggest that several species in this forest begin to reduce their allocation to apical growth around the canopy layer at the onset of stable reproduction.
Author Maki Suzuki
Maki Suzuki,,
, Kiyoshi Umeki
Kiyoshi Umeki,,
, Olga Orman (FoF / IoEaS / DoDFB)
Olga Orman,,
, Mitsue Shibata
Mitsue Shibata,,
, Hiroshi Tanaka
Hiroshi Tanaka,,
, Shigeo Iida
Shigeo Iida,,
, Tohru Nakashizuka
Tohru Nakashizuka,,
, Takashi Masaki
Takashi Masaki,,
Journal seriesOecologia, ISSN 0029-8549, e-ISSN 1432-1939, (N/A 100 pkt)
Issue year2019
Publication size in sheets0.5
Keywords in EnglishDeciduous trees, H–D relationship Life-history strategy, Breakpoint height, Reproductive onset
ASJC Classification1105 Ecology, Evolution, Behavior and Systematics
URL https://doi.org/10.1007/s00442-019-04477-y
Languageen angielski
Score (nominal)100
Score sourcejournalList
Publication indicators WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2016 = 1.262; WoS Impact Factor: 2018 = 2.915 (2) - 2018=3.323 (5)
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Wkład autorówAuthor contribution statement HT, MIS, SI, TN, and TM collected core data of this project; OO collected data of forest structure; MAS conceived the ideas and led the writing of the manuscript; KU and MAS analyzed the data; TM, KU, OO and other authors contributed critically to improve the drafts. All authors gave fnal approval for publication.
FinansowanieThis work was partially supported by the Japan Society for the Promotion of Science KAKENHI Grant [Grant numbers JP24247003, JP25241026, and JP15H04517].
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