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Stomatal resistance, photosynthesis and water relations in mountain birch in the subarctic.

作者信息

Kauhanen Heikki

机构信息

Department of Biology, University of Turku, 20500 Turku, Finland.

出版信息

Tree Physiol. 1986 Dec;2(1_2_3):123-130. doi: 10.1093/treephys/2.1-2-3.123.

DOI:10.1093/treephys/2.1-2-3.123
PMID:14975847
Abstract

The role of water in regulating stomatal aperture and carbon assimilation of mountain birch (Betula pubescens Ehrh. ssp. tortuosa (Ledeb.) Nyman) was studied in the Swedish Subarctic. Stomata exhibited a clear response to changes in humidity and water potential. High evaporative demand caused stomatal closure at midday. The diurnal curve of net photosynthesis, measured on a warm day in early July, had two peaks, and photosynthetic rate was reduced by 25-30% at midday.

摘要

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