Persistency and monosaccharide composition of polysaccharides of soil which received no plant materials for a certain period under field conditions

Changes in the monosaccharide composition during the decomposition of straws under field conditions

“…The present experiments consisted of three different series (Table 1): straw-soil mixture series (PI, P2, VI, V2), straw series without soil (P4, P5, V4, VS), and soil series without straw (P3, V3). P3 and V3 were designed to obtain reference values for the calculation of residual weight and amounts of straw (MURAYAMA, 1981). The materials and methods for the experimental series PI-P3 and VI-V3 have been described previously (MURAYAMA, 1981(MURAYAMA, , 1984.…”

Chemical properties of subsurface peats and their decomposition kinetics under field conditions

“…In order to examine the effects of air-drying on the decomposition, the remaining bags of the samples of the paddy field experiment were dug up in late April after the snow melted, and the in situ sample bags were air-dried at room temperature for about 1 month, and replaced in the same field after transplantation of rice seedlings. At intervals, the bags were dug up, air-dried and weighed (Murayama 1981). The concentrations of total carbon and nitrogen of the powdered samples were determined, and the changes in the amounts were calculated.…”

“…Fresh moist peat which had never been dried (equivalent to 1.4-2.5 g when dried at 105"C) mixed with moist soil (equivalent to 10 g when dried at 105"C), or moist peat without soil was packed in a bag made of microfiber glass paper. Each bag was covered with a larger bag consisting of a 40 mesh net made of polyvinylidene chloride (Maeda and Onikura 1977;Murayama 1981). The bags were placed horizontally at a depth of 7-10 cm.…”

“…The content of saccharides released by 0.5 M Na2SO4 extractable-C or N/Total-C or N (%); b ethanol-benzene (1:1) extraction, weight of ash-free weight of sample; c saccharides-C/total-C (%); ~ residual C, N of two-step hydrolysis of saccharides, weight percentage of ash-free weight of sample. percentage for release two-step hydrolysis with sulphuric acid was determined by gas-liquid chromatography (GLC) of their alditol acetates, using myo-inositol as an internal standard (Murayama 1981). The saccharides released in the primary hydrolysis were designated as hemicellulosic saccharides and those released in the secondary hydrolysis as cellulosic saccharides.…”

Determination of carbohydrates in hydrolysates of volcanic ash soil by liquid chromatography with fluorescence spectroscopy

“…Gas-liquid-chromatography has been commonly applied for the qualitative and quantitative determination of component sugars of hydrolysates of soil polysaccharides (1,(5)(6)(7).…”