地力に及ぼす集約的保育作業の影響(II) : 生枝打ちで落とされたスギ針葉の分解と養分動態

概要

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It is very important to clarify the nutrient circulation of fallen foliage from green pruning in an intensively managed plantation. Decomposition and subsequent disappearance of potential nutrients of sugi (Cryptomeria japonica D.DON) foliage, fallen by green pruning, were investigated with the fence method. The weight-remains proportion of the fallen foliage was about 60% one year after pruning. The nitrogen and phosphorus of the fallen foliage increased until 6 months after pruning and reached 120〜140 and 160〜200%, respectively. Potassium decreased 80% until one year after pruning. Calcium and magnesium also decreased, showing about 30〜50 and 10〜30%, respectively, until one year after pruning. If foliage fallen by green pruning shows the same tendency as that found by using the fence method, nitrogen and phosphorus of fallen foliage increase until 6 months after pruning. These increased amounts were equivalent to 20〜40% for nitrogen and 60〜100% for phosphorus of the nutrient content of foliage fallen by pruning.
1983-06-25