Effect of Water Stress on Photosynthesis and Transpiration in Three Tall Deciduous Trees

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  • 落葉高木3樹種の光合成,蒸散におよぼす水分ストレスの効果
  • 落葉高木3樹種の光合成,蒸散におよぼす水分ストレスの効果〔英文〕
  • ラクヨウ コウボク 3 ジュシュ ノ コウゴウセイ ジョウサン ニ オヨボス

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Abstract

The relationships between water stress and rates of net photosynthesis (NP) and transpiration (TR) were determined in pot-grown seedlings of Fagus crenata BLUME, Quercus mongolica var. grosseserrata REHD. et WILS. and Q. serrata THUNB. In all of them, the xylem pressure-potential (XPP) decreased exponentially with soil drying, and NP and TR decreased considerably. The trends varied distinctively among the species. In F. crenata, NP began to decrease at about -0.7 MPa XPP and reached 20 to 30 percent of the maximum NP rate at -1.5 MPa XPP, whereas in Q. serrata, the reduction began at -1.0 to -1.2 MPa and remained at 50 to 60 percent of the NP level even at -2.0 MPa XPP. In Q. mongolica var. grosseserrata, the decrease was intermediate between the other two species. For all three species, high positive correlations were found in NP-TR relationships, and high negative correlations were occurred in XPP-water saturation deficit(WSD) relationships. The rates of NP and NP/TR ratios under well-watered conditions were in the following order for both: Q. serrata>Q. mongolica var. grosseserrata>F. crenata. It seems likely that the differences in these ecological tolerance characteristics are one of the reasons why F. crenata dominates on mesic, deep forest soils, and Q. serrata and Q. mongolica var. grosseserrata are able to thrive on xeric, shallow forest soils.

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