Yasuo Takai

TL;DR: Methane is a gas occurring in nature as a product of anaerobic bacterial decemposition of organic matter under water as mentioned in this paper, and it arises not only from stagnaat and putrescent, pools but also from soils used in rice culture during summer (1,2.3).

TL;DR: In this article, the authors investigated quantitative relationships between the microbial decomposition of soil organic matter and the oxidation-reduction reactions in the submerged soils which are affected by soil temperature.

TL;DR: In this paper, the nitrogen mineralization process in the submerged soils was mathematically formulated by a new technique, and parameters in the formula were examined in relation to temperature and soil properties, and it was found that the N-mineralization process could be expressed by the following formula which was composed of two first-order reactions (Ist term, quick reaction [q]; 2nd term, slow reaction [s]): where N is the amount of mineralized N, t is time of incubation, and N oq, N os, kq, and ks

TL;DR: In this article, the authors proved that the ferric iron reduction in submerged paddy soils is entirely or mostly effected by the activities of microorganisms in the soil, working with the soil itself.

TL;DR: Isotopic composition of nitrogen in soil organic matters from subalpine forest areas, upland, and paddy fields in Japan was investigated in this paper, where a simple model was presented to elucidate major factors that govern 15N content of soil organic materials.