Laboratory of Soil Science 本文へジャンプ

Our laboratory's Main Projects of Research


The Soil Science Laboratory has joint soil survey every year, along with Soil Science Laboratories of Tokyo University of Agriculture and Technology, Nihon University and Meiji University.Since last year the soil survey flared with University of Tsukuba also.This March Mr.Shohei Obana was awarded by the president of Chiba University, Prof. Toyoki KOZAI as Mr Obana was the chief organizer of this annual joint field work-commendation in 2005, when our laboratory filled the function of secretariat.

Greenhouse Gas Emission and Soil Microbial Ecology.

Increasing concentrations of carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) are driving factors of global warming and climate change.  Sources and sinks of these gases are closely related to soil environment.  For example, CH4 is emitted from submerged paddy soil and natural wetland, while uptaken by forest soil or other aerobic soil.  We are conducting a series of researches regarding to CH4 production, transportation and oxidation.  Also contribution of two main processes of N2O production, nitrification and denitrification, is examined in arable Andosol, salt-affected soil and other soils.  Gas emission from natural wetland, from cooler temperate and tropical peatland, are investigated to find controlling factors of the emission.  Effect of rising CO2 concentration on microbial biomass and organic mater dynamics in paddy soil are studies in laboratory, closed chamber and open field level.

Function of Microbial Biomass in Upland Soils and Paddy Soils.

Soil microbial biomass, which is a part of the active organic fraction in soil, is considered
to be an important sink and source for plant nutrients.  The estimation of microbial biomass in soil is essential for the maintenance and improvement of soil fertility.  We have investigated the size and turnover time of microbial biomass-C in the 5 upland soil types located in Chiba Prefecture and elucidated the close relation of the function of microbial biomass-C to the soil physicochemical properties.  We also examine applicability of method measuring biomass in aerobic soil to submerged paddy soil.  Effects of controlled release coated urea and other soil amendments on microbial biomass are investigating.

Microbial Aspects of Composting and Effect of Composts on Soil Environment

Composting process from waste or unused materials is desirable from viewpoints of material cycling and sustainable development.  Leaf and grass straw mixture was composting to monitor biochemical and microbiological changes.  Effects of compost application on soil fertility and biological process are also monitoring in long-term experimental plots in our campus.