The Return of Nutrients with Litter Fall in the Forest Ecosystems (II)

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  • Litter Fallによる養分還元量について (II)
  • Litter fallによる養分還元量について-2-有機物量および養分還元量
  • Litter fall ニ ヨル ヨウブン カンゲンリョウ ニ ツイテ 2 ユウキ ブツリョウ オヨビ ヨウブン カンゲンリョウ
  • 有機物量および養分還元量
  • The Amount of Organic Matter and Nutrients

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The amounts of litter fall and nutrients contained therein were measured throughout a year in six forests (two Pinus densiflora, a Chamaecyparis obtusa, a Fagus crenata, a Quercus mongolica and an evergreen broad leaved forests) and one nursery (Camptotheca acummata).<br> 1) The amount of total litter fall was 2.51_??_7.76 ton/ha•yr. Leaf-litter accounted for 54_??_78% thereof in conferous forests and 83% in deciduous forests.<br> 2) The total litter fall per annum contained 15.2_??_72.5kg/ha in nitrogen, 0.7_??_5.0kg/ha in phosphorus, 3.6_??_16.4kg/ha in potassium, 22.3_??_72.6kg/ha in calcium and 2.7_??_13.8kg/ha in magnesium. Nitrogen, phosphorus and potassium were contained more in broad leaved forests than in coniferous forests.<br> 3) Ratios of nutrient return with the total litter fall to nutrient uptake of the forest growth were 33_??_52% for nitrogen, 36_??_69% for phosphorus, 23_??_43% for potassium, 62_??_85% for calcium and 52_??_98% for magnesium.<br> 4) Ratios of nutrient return with the total annual litter fall to the respective existing nutrients in the forest ecosystems were 0.2_??_0.9% for nitrogen, 1.8_??_4.5% for phosphorus, 0.6_??_2.9% for potassium, 1.6_??_5.4% for calcium and 3.3_??_9.4% for magnesium.

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