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Effects of leaf age,elevation and light conditions on photosynthesis and leaf traits in saplings of two evergreen conifers,Abies veitchii and ***

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Journal of Plant Ecology 2020年第4期13卷 460-469页

作者： rina suzuki Koichi Takahashi Department of Science Graduate School of Science and TechnologyShinshu UniversityAsahi 3-1-1Matsumoto 390-8621Japan Department of Biology Faculty of ScienceShinshu UniversityMatsumoto 390-8621Japan Department of Mountain Ecosystem Institute for Mountain ScienceShinshu UniversityAsahi 3-1-1Matsumoto 390-8621Japan

Aims Subalpine coniferous species are distributed over a wide range of elevations in which they must contend with stressful conditions,such as high elevations and extended periods of *** evergreen coniferous species,Abies veitchii and Abies mariesii,dominate at low and high elevations,respectively,in the subalpine zone,central *** aim of this study is to examine the effects of leaf age,elevation and light conditions on photosynthetic rates through changes in morphological and physiological leaf traits in the two *** We here examined effects of leaf age,elevation and light conditions on photosynthesis,and leaf traits in *** and *** of the two conifers were sampled in the understory and canopy gaps at their lower(1600 m)and upper(2300 m)distribution *** Findings The two species showed similar responses to leaf age and different responses to elevation and light conditions in photosynthesis and leaf *** maximum photosynthetic rate of *** is correlated negatively with leaf mass per area(LMA)and non-structural carbohydrate(NSC)*** increased at high elevations in the two species,whereas NSC concentrations increased only in ***,the maximum photosynthetic rate of *** decreased at high ***,maximum photosynthetic rates correlate positively with nitrogen concentration in both *** the understory,leaf nitrogen concentrations decreased and increased in *** and ***,*** decreased and the chlorophyll-to-nitrogen ratio increased in understory conditions only for ***,suggesting it has a higher light-capture efficiency in dark conditions than does *** study concluded that *** has more shade-tolerant photosynthetic and leaf traits and its photosynthetic rate is less affected by elevation compared with ***,allowing *** to survive in the understory and to dominate at high elevations.

关键词： leaf chlorophyll leaf mass per area leaf nitrogen non-structural carbohydrate concentration stable carbon–isotope ratio

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Comparison of Carbon Dynamics among Three Cool-Temperate Forests (<i>Quercus serrata, Larix kaempferi</i>and <i>Pinus densiflora</i>) under the Same Climate Conditions in Japan

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Journal of Environmental Protection 2019年第7期10卷 929-941页

作者： Mitsutoshi Tomotsune Yohei suzuki Yuki Kato rina Masuda Nobuhiko Suminokura Yuta Koyama Yoshiaki Sakamaki Hiroshi Koizumi Faculty of Education and Integrated Arts and Science Waseda University Tokyo Japan Faculty of Science and Engineering Waseda University Tokyo Japan Waseda Research Institute for Science and Engineering Waseda University Tokyo Japan

To understand the role of forest ecosystems in the global carbon cycle, it is important to clarify the factors affecting the carbon balance of forest ecosystems. However, little is known about the direct effect of forest types, especially dominant species, on their different carbon dynamics. To clarify the effect of difference in forest types, an experiment was conducted in three forests, which were located in the same place and exposed to the same climate conditions. These forests were middle-aged (40 - 45 years) and dominated by Quercus serrata (Q forest), Larix kaempferi (L forest) and Pinus densiflora (P forest). Net primary production (NPP), heterotrophic respiration (HR) and net ecosystem production (NEP) were estimated in each forest, using a biometric method over one year. For NPP estimated from the annual growth of tree biomass (ΔB) and amount of litter (LF), P forest NPP (5.3 MgC·ha-1·yr-1) was higher than Q and L forest NPP (4.6 and 3.2 MgC·ha-1·yr-1). The difference was affected by a significant difference in ΔB (p = 0.032) and LF (p -1·yr-1) was higher than L and P forest (2.3 and 2.1 MgC·ha-1·yr-1). This difference could result from the amount of litter (respiration substrate) and chemical properties of litter (lability of decomposition). The NEP, which was calculated from the difference between NPP and HR, varied widely among the forest types (0.5, 0.9 and 3.2 MgC·ha-1·yr-1 in Q, L and P forests, respectively). The range of values among the forest types was comparable to those among age sequences and climate zones in previous studies. These results suggest that the difference in forest types (especially dominant species) can potentially lead to a large variation in carbon dynamics, in ecosystems located in the same place.

关键词： Dominant Species Functional Type Heterotrophic Respiration Net Ecosystem Production Net Primary Production

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