いくつかの常緑針葉林における落葉枝量と分解〔英文〕

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There are two main objects in the present study ; the first is to investigate the seasonal variation of litter fall, and the second is to measure the rate of litter decomposition, relating to the environmental factors of the stands studied. For estimating the amount of litter fall, a quadrat of 20×20m in size was set in each stand and nine circular traps with a wire frame covered with nylon net (0.6m in diameter and 0.7m in height) were established, using the method of MIYATA and OMURA (1967). The seasonal variation of litter fall was studied in relation to the developmental progress of some ever-green coniferous forests at the Ebino Heights, in the southern part of Kyushu. The litter fall was concentrated in autumn in all stands, and showed a synchronized seascnal variation irrespective of the difference in age and floristic composition of the stands. To determine the rate of decomposition, the litter bag method was applied. The sample leaves were laid evenly in the bag of 16×16cm in size, which is made of polyethylene net. The analysis of the relationships between the decomposition rate of litter and two main environmental factors (air-temperature and precipitation) was carried out. As the results of this analysis and making reference to the calculation of MADGE's data, the author proposed the following two equations. [numerical formula] [numerical formula] where N and No are the amounts of organic matter at the time t and the initial stage, respectively and a, a', b, b' show the constants. Equation (1) is applied to the area where precipitation is sufficient and air-temperature is low, as in the case of the Ebino Heights. Equation (2) is applied to the area where air-temperature is high and precipitation is insufficient, as in the case of Ib■dsn, Nigeria.
日本生態学会の論文
1970-10-01

いくつかの常緑針葉林における落葉枝量と分解〔英文〕

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