ススキ共同体と土壌との関係に関する研究-4-〔英文〕

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To clarify the effect of edaphic factors on the annual production in the M. sinensis type grassland, a series of investigations were carried out by the authors for the last four years at Kawatabi and Tonomine. The present report deals with the relationship among the standing crop of plants, the components of humus, seasonal change of soil moisture, amount of inorganic nitrogen and soil respiration. The amount of the minerals such as potassium and magnesium, etc. in the fulvic acid of the humus in the plot having a high standing crop was more than that of the plot having a lower standing crop. On the other hand, the presence of a considerable amount of Al in the fulvic acid was shown in the low yield plots. The seasonal variation of the soil moisture in the high yield plot was small. Generally, the soil moisture of the upper layer (0-30 cm) was constantly kept at a high level. On the contrary, the soil moisture of the upper layer decreased from July to October in the low yield plots. The plot having a deep humus soil layer and favorable soil moisture content had NH_4-N and HO_2-N a little more than those of the other plots. These were conditioned to contain water in 60 per cent of the maximum water holding capacity and placed in a thermostat at 30℃ for 3 weeks. Thereafter, quantitative analysis was made on the amount of NH_4-N and NO_2-N. This amount may be considered as potential available nitrogen. The amount of NO_2-N was scarce, but that of NH_4-N was extremely great, in general. The produced amount of CO_2 and the accumulation of exchangeable calcium in Plot 3 were larger than in the other plots. There seems to be a considerable amount of available nitrogen in the soil for the vigorous reproduction of micro-organisms.
日本生態学会の論文
1972-10-20

ススキ共同体と土壌との関係に関する研究-4-〔英文〕

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