A5001210673- Peatlands and Wetlands Ecology
- Oil Palm Production and Sustainability
- Atmospheric and Environmental Gas Dynamics
- Fire effects on ecosystems
- Soil Carbon and Nitrogen Dynamics
- Soil and Unsaturated Flow
- Ecology and Conservation Studies
- Conservation, Biodiversity, and Resource Management
- Leaf Properties and Growth Measurement
- Coastal wetland ecosystem dynamics
- Greenhouse Technology and Climate Control
- Regional Development and Environment
- Hydrocarbon exploration and reservoir analysis
- Forest Ecology and Biodiversity Studies
- Potato Plant Research
- Groundwater flow and contamination studies
Hokkaido Research Organization
2018-2022
Hokkaido University
2014-2022
Soil respiration (SR) rate was measured at the burned land (BL), cropland (CL), forest (FL) and grassland (GL) of a tropical peatland in Central Kalimantan, Indonesia from 2002 to 2011 for purpose analysis with relation drying rewetting. The SR fitted groundwater level (GWL) equation log(SR) = α – β × GWL using hierarchical Bayesian where were regression coefficients classified by changing directions (drying, rewetting fluctuating), water-filled pore space (WFPS) ranges topsoil (low 0–0.54,...
This study investigated spatial factors controlling CO2, CH4, and N2O fluxes compared global warming potential (GWP) among undrained forest (UDF), drained (DF), burned land (DBL) on tropical peatland in Central Kalimantan, Indonesia. Sampling was performed once within two weeks the beginning of dry season. CO2 flux significantly promoted by lowering soil moisture pH. The result suggests that oxidative peat decomposition enhanced drier position, acidify soils. CH4 a rise groundwater level,...
(1) Background: Nitrogen (N) fertilization on drained tropical peatland will likely stimulate peat decomposition and mineralization, enhancing N2O emission from the soil. (2) Methods: A field experiment was conducted to quantify emissions soil in an oil palm plantation (Elaeis guineensis Jacq.) located a Sarawak, Malaysia, under different rates of N fertilizers. The study January 2010 December 2013 resumed 2016 2017. Nitrous oxide (N2O) flux measured every month using closed chamber method...
Hierarchical Bayesian (HB) methods are useful tools for modeling multifaceted, nonlinear phenomena such as those encountered in ecology, and have been increasingly applied environmental sciences, e.g., to estimate soil gas flux from different textures or sites. We developed a model of carbon dioxide (CO2) based on temperature (T, 5 cm depth) water-filled pore space (WFPS, using HB theory. The was calibrated dataset CO2 measured bare soils belonging four texture classes 14 upland field sites...
A long-term study on the effect of nitrogen (N) fertilization soil carbon dioxide (CO2) fluxes in tropical peatland was conducted to (1) quantify annual CO2 emissions from an oil palm plantation under different N application rates and (2) evaluate temporal effects groundwater level (GWL) water-filled pore space (WFPS) organic (SOC) fluxes. Monthly measurement using a closed chamber method carried out January 2010 until December 2013 2016 2017 peat Sarawak, Malaysia. Besides control (T1,...
It is essential to manage nitrogen (N) fertilization obtain the appropriate protein contents in wheat grains. In this study, N uptake from booting stage flag leaf appearance, and tiller number at panicle formation stages was estimated using a handheld active optical sensor of normalized difference vegetation index (NDVI) under different measurement conditions Hokkaido, Japan. A stable NDVI obtained if measured horizontally 60–120 cm height canopy regardless ambient radiation local times ....
Palm oil accounts for about 40% of the global demand vegetable oil. To meet demand, palm plantations have expanded in humid tropics at expense tropical forests. Land conversion begins with clear cutting and generates much woody debris, which was stacked rows. Woody debris decomposes emits carbon dioxide (CO2), but time course decomposition is not well understood, especially early stage. Thus, we measured (C) stock a newly established plantation after secondary peat swamp forest Sarawak,...
<p>Anthropogenic activities, and in particular the use of synthetic nitrogen (N) fertilizer, have a significant influence on soil nitrous oxide (N<sub>2</sub>O) emission from oil palm plantation tropical peatland. Finding suitable N rate for optimum uptake efficiency yield with low environmental impact production cost is crucial economic growth Malaysia’s sector. However, studies fertilizers N<sub>2</sub>O...