Papers by Hisanori HARAYAMA
European Journal of Forest Research
Bookmarks Related papers MentionsView impact
Frontiers in Plant Science, 2022
For a successful natural regeneration of Japanese white birch (Betula platyphylla var. japonica),... more For a successful natural regeneration of Japanese white birch (Betula platyphylla var. japonica), competitive vegetation should be managed. Here, we clarified how soil water condition modifies the competitiveness of Japanese white birch against perennial weeds, Eupatorium species, based on an ecophysiological approach combining a glasshouse experiment and a field survey. We investigated photosynthetic and growth responses to various water regimes from water deficit to waterlogging (two times-a-week irrigation, three times-a-week irrigation, half waterlogging, and full waterlogging) in pot-grown seedlings of Japanese white birch and the competitive weed Eupatorium makinoi. The ratio of seedling height of Japanese white birch to seedling height of E. makinoi showed a decreasing trend from two times-a-week irrigation to full waterlogging, which suggests a lower competitiveness for light resource in Japanese white birch with increasing soil wetness. The maximum rate of Rubisco carboxyla...
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Journal of The Japan Forest Engineering Society, 2018
Bookmarks Related papers MentionsView impact
Nihon Seitai Gakkaishi, 2009
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Boreal Forest Research, 2013
Bookmarks Related papers MentionsView impact
Boreal Forest Research, 2012
Bookmarks Related papers MentionsView impact
Boreal Forest Research, 2013
Bookmarks Related papers MentionsView impact
Boreal Forest Research, 2012
Bookmarks Related papers MentionsView impact
The density and architecture of leaf veins determine the network and efficiency of water transpor... more The density and architecture of leaf veins determine the network and efficiency of water transport within laminae and resultant leaf gas exchange and vary widely among plant species. Leaf hydraulic conductance (<i>K</i><sub>leaf</sub>) can be regulated by vein architecture in conjunction with the water channel protein aquaporin. However, our understanding of how leaf veins and aquaporins affect leaf hydraulics and stomatal conductance (<i>g</i><sub>s</sub>) remains poor. By inducing blockage of the major veins and inhibition of aquaporin activity using HgCl<sub>2</sub>, we examined the effects of major veins and aquaporins on <i>K</i><sub>leaf</sub> and <i>g</i><sub>s</sub> in species with different venation types. A vine species, with thick first-order veins and low vein density, displayed a rapidly declined <i>g</i><sub>s</sub> with high leaf water po...
Bookmarks Related papers MentionsView impact
All data generated or analysed during this study
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Journal of Forestry Research, 2020
Japanese larch (Larix kaempferi (Lamb.) Carr.) and its hybrid are economically important conifero... more Japanese larch (Larix kaempferi (Lamb.) Carr.) and its hybrid are economically important coniferous trees widely grown in the Northern Hemisphere. Ground-level ozone (O3) concentrations have increased since the pre-industrial era, and research projects showed that Japanese larch is susceptible to elevated O3 exposures. Therefore, methodologies are needed to (1) protect Japanese larch against O3 damage and (2) conduct biomonitoring of O3 in Japanese larch forests and, thus, monitor O3 risks to Japanese larch. For the first time, this study evaluates whether the synthetic chemical ethylenediurea (EDU) can protect Japanese larch against O3 damage, in two independent experiments. In the first experiment, seedling communities, simulating natural regeneration, were treated with EDU (0, 100, 200, and 400 mg L−1) and exposed to either ambient or elevated O3 in a growing season. In the second experiment, individually-grown saplings were treated with EDU (0, 200 and 400 mg L−1) and exposed to...
Bookmarks Related papers MentionsView impact
Remote Sensing of Environment, 2021
Abstract Electron transport rate (ETR), estimated from chlorophyll fluorescence, is a widely-used... more Abstract Electron transport rate (ETR), estimated from chlorophyll fluorescence, is a widely-used indicator of photosynthetic activity. However, net photosynthetic CO2 assimilation rate (A) does not linearly correlate with ETR when the fraction of electron partitioning into photosynthesis and photorespiration changes under fluctuating environmental conditions (CO2, light, temperature and soil moisture). Here, we propose a practical approach to estimate A based on ETR with integration of stomatal conductance (gs) and leaf temperature, taking intercellular CO2 concentration (Ci)- and temperature-dependent electron partitioning into account. A estimated with the present approach was in good agreement with A measured under i) various CO2 concentrations and light intensities in seedlings of Japanese beech and Japanese white birch, and ii) under 400 and 800 μmol mol−1 CO2 and temperatures of 15–40 °C, and iii) in progress of drought stress after a water withholding in seedlings of Japanese white birch. Furthermore, canopy-level CO2 uptake could be estimated based on the spectroscopic and flux observations over a Japanese beech stand, under a wide range of environmental conditions. The present approach is advantageous because it does not require biochemical information, such as the maximum rates of Rubisco carboxylation and electron transport, providing a more forward approach to estimate terrestrial carbon flux through remote sensing approaches.
Bookmarks Related papers MentionsView impact
Biomass and Bioenergy, 2020
Bookmarks Related papers MentionsView impact
Forests, 2020
Weed control, which is commonly achieved by herbicides, is important in successfully establishing... more Weed control, which is commonly achieved by herbicides, is important in successfully establishing short-rotation coppice (SRC) of willow. In this study, we examined agricultural mulch film as a means of effective weed control and the influence of cutback practice (coppicing the first year’s shoot growth in the winter following planting) on biomass production in boreal Hokkaido, Japan. One-year-old cuttings from two clones each of Salix pet-susu and S. sachalinensis were planted in double-rows at a density of 20,000 plants ha−1. All plants were harvested three growing seasons after cutback. Average oven-dried biomass yield was 5.67 t ha−1 yr−1 with mulching, whereas it was 0.46 t ha−1 yr−1 in the unmulched control with a weed biomass of 4.13 t ha−1 yr−1, indicating that mulching was an effective weed control. However, weeds grew vigorously on the ground between mulch sheets and their dry biomass amounted to 0.87 t ha−1 yr−1. Further weeding between the mulch sheets enhanced the willo...
Bookmarks Related papers MentionsView impact
Uploads
Papers by Hisanori HARAYAMA