A5044424799- Plant Water Relations and Carbon Dynamics
- Tree Root and Stability Studies
- Soil Carbon and Nitrogen Dynamics
- Forest ecology and management
- Plant nutrient uptake and metabolism
- Plant responses to water stress
- Forest Ecology and Biodiversity Studies
- Seedling growth and survival studies
- Ecology and Vegetation Dynamics Studies
- Remote Sensing and LiDAR Applications
- Fire effects on ecosystems
- Geophysical Methods and Applications
- Mycorrhizal Fungi and Plant Interactions
- Tree-ring climate responses
- Plant responses to elevated CO2
- Coastal wetland ecosystem dynamics
- Peatlands and Wetlands Ecology
- Soil erosion and sediment transport
- Landslides and related hazards
- Plant Ecology and Soil Science
- Forest Management and Policy
- Legume Nitrogen Fixing Symbiosis
- Cryospheric studies and observations
- Plant Physiology and Cultivation Studies
- Plant Molecular Biology Research
Kyoto University
2015-2025
Université de Lorraine
2009-2018
AgroParisTech
2018
Centre d'Études Scientifiques et Techniques d'Aquitaine
2009-2016
Kobe University
2005-2012
Institut National de la Recherche Agronomique
2011
Obayashi (Japan)
2010
Forestry and Forest Products Research Institute
2006-2010
University of Yamanashi
2010
Ehime University
2010
Understanding how plants are constructed—i.e., key size dimensions and the amount of mass invested in different tissues varies among individuals—is essential for modeling plant growth, carbon stocks, energy fluxes terrestrial biosphere. Allocation patterns can differ through ontogeny, but also coexisting species adapted to environments. While a variety models dealing with biomass allocation exist, we lack synthetic understanding underlying processes. This is partly due suitable data sets...
The determination of dead roots is important for clarifying the roles fine tree in carbon (C) and nutrient cycling forest ecosystems. However, various methods proposed determining variation terminology expressing fine-root mortality can cause significant errors quantifying roots. In this study, we aimed to clarify criteria used sorting using published papers. second aim was identify problems defining border between root litter. Finally, propose future challenges collect data with same...
Fine root respiration is a significant component of carbon cycling in forest ecosystems. Although fine roots differ functionally from coarse roots, these types have been distinguished based on arbitrary diameter cut-offs (e.g., 2 or 5 mm). morphology directly related to physiological function, but few attempts made understand the relationships between and roots. To examine rates morphological traits (0.15–1.4 mm diameter) mature Quercus serrata Murr., we measured small segments field with...
The study of the fate assimilated carbon in respiratory fluxes field is needed to resolve residence and transfer times atmosphere–plant–soil system forest ecosystems, but it requires high frequency measurements isotopic composition evolved CO2. We developed a closed transparent chamber label whole crown tree labelling capable delivering 3-h pulse 99% 13CO2 field. compositions trunk soil CO2 effluxes were recorded continuously on two labelled one control trees by tuneable diode laser...
Abstract. Soil CO2 efflux is the main source of from forest ecosystems and it tightly coupled to transfer recent photosynthetic assimilates belowground their metabolism in roots, mycorrhiza rhizosphere microorganisms feeding on root-derived exudates. The objective our study was assess patterns carbon allocation among tree species along seasons. Pure 13CO2 pulse labelling entire crown three different (beech, oak pine) carried out at distinct phenological stages. Excess 13C soil tracked using...
The root systems of forest trees are composed different diameters and heterogeneous physiological traits. However, the pattern respiration rates from finer coarser roots across various tropical species remains unknown. To clarify how is related to morphological traits roots, we evaluated specific its relationships mean diameter (D) tissue density (RTD; mass per unit volume; gcm−3) length (SRL; mass; mg−1) fine among within 14 13 a primary rainforest in Pasoh Forest Reserve Peninsular...
• Phloem is the main pathway for transferring photosynthates belowground. In situ13C pulse labelling of trees 8–10 m tall was conducted in field on 10 beech (Fagus sylvatica) trees, six sessile oak (Quercus petraea) and maritime pine (Pinus pinaster) throughout growing season. Respired 13CO2 from trunks tracked at different heights using tunable diode laser absorption spectrometry to determine time lags velocity carbon transfer (V). The isotope composition phloem extracts measured several...
Potassium (K) is an important limiting factor of tree growth, but little known the effects K supply on long-distance transport photosynthetic carbon (C) in phloem and interaction between fertilization drought. We pulse-labelled 2-year-old Eucalyptus grandis L. trees grown a field trial combining (+K −K) throughfall exclusion (+W −W), we estimated velocity C transfer by comparing time lags uptake 13CO2 its recovery trunk CO2 efflux recorded at different heights. also analysed dynamics...
Abstract Drought-induced tree death has become a serious problem in global forest ecosystems. Two nonexclusive hypotheses, hydraulic failure and carbon starvation, have been proposed to explain die-offs. To clarify the mechanisms, we investigated physiological processes of drought-induced saplings with contrasting Huber values (sapwood area/total leaf area). First, reduced respiration were found initial process decline, last stage starvation led death. The carbohydrate reserves at stem...
Phloem failure has recently been recognized as one of the mechanisms causing tree mortality under drought, though direct evidence is still lacking. We combined 13C pulse-labelling 8-year-old beech trees (Fagus sylvatica L.) growing outdoors in a nursery with an anatomical study phloem tissue their stems to examine how drought alters carbon transport and capacity. For six predawn leaf water potential ranged from -0.7 -2.4 MPa, compared average -0.2 MPa five control no stress. also observed...
13 CO2 pulse-labelling experiments were performed in situ on adult beeches (Fagus sylvatica) and pines (Pinus pinaster) at different phenological stages to study seasonal interspecific short-term dynamics partitioning of recently assimilated carbon (C) leaves. Polar fraction (PF, including soluble sugars, amino acids organic acids) starch purified from foliage sampled during a 10-d chase period. C contents, isotopic compositions parameters determined bulk foliage, PF starch. Decrease amount...
Trees, typically large trees in upland forests, emit CH4 produced their trunk by methanogenic archaea. In this case, spatial variability of emission can be more complicated than when tree trunks act as a passive conduit for the soil. However, due to poor accessibility, emissions from above 3 m, where researcher cannot reach without ladder, scaffold or crane, have not been well studied. The vertical patterns trunks, including upper part, and processes driving them, i.e., production transport,...
Mangrove forest is one of the most carbon storing tropical forests. Thus, understanding dynamics greenhouse gas such as CO2 and CH4 are important to predict future. produced by plant respiration, dissolved in water transported upwards with transpiration. Active respiration mangrove roots occurs because salt from seawater must be excluded before enters xylem. Therefore, tidal fluctuation can affect exchange between tree surface atmosphere. anaerobic conditions sediment not readily soluble...
Forest soils play a critical role in the global methane (CH4) budget, but magnitude of CH4 fluxes varies significantly across landscape, spatially and temporally. In complex landscapes, soil hydrology is strongly influenced by variations topography vegetation, which affect (FCH4). Consequently, accurately scaling FCH4 to landscape level significant challenge. This study aimed develop methodology for seasonal topographically cold temperate mountain forest.This was conducted upper watershed...
We evaluated the carbon budget of coarse woody debris (CWD) in a temperate broad-leaved secondary forest. On basis field survey conducted 2003, mass CWD was estimated at 9.30 tC ha -1 , with snags amounting to 60% total mass. Mean annual input be 0.61 yr by monitoring tree mortality forest from 1999 2004. decomposition rate as CO 2 evolution measuring emissions 91 samples ( R ) closed dynamic chamber and infrared gas analysis system. The relationships between temperature chamber, water...