Effects of Shading and Soil Moisture Conditions on Transpiration and Dry Matter Production in Fir, Spruce, and Birch Seedlings

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  • トドマツ,アカエゾマツ,シラカンバの苗木の蒸散量と乾物生産量に与える庇陰と土壌水分の影響
  • トドマツ,アカエゾマツ,シラカンバの苗木の蒸散量と乾物生産量に与える疵陰と土壌水分の影響〔英文〕
  • トドマツ アカエゾマツ シラカンバ ノ ナエギ ノ ジョウサンリョウ ト カン

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In each species, total transpiration was linearly correlated with dry matter production in all the treatments. Abies in the open and Betula in the shade used water most efficiently. In the shade, the difference in transpiration ratio among the soil moisture levels was significant only in Betula. Betula showed the highest growth rate in the moderate soil moisture level. In Abies and Picea, transpiration and dry matter increment decreased remarkably in the dry soil moisture level, but differences between the wet and the moderate level were not apparent. In the open, with increasing soil moisture the transpiration ratios in Abies and Betula increased, while in Picea the ratio decreased. However, differences among the three soil moisture levels were not significant. Abies and Betula showed the highest growth rate in the moderate soil moisture level, while Picea grew best in the wet one. The effect of soil moisture on the transpiration ratio was not so remarkable as compared with the shading.

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