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- W2023472313 abstract "Pinus pumila (Pallas) Regel. is a dominant dwarf tree in alpine regions of Japan. The possible factors limiting the net photosynthetic rate ( P n ) of the needles of P . pumila were examined in the snow‐melting (May) and the summer (August) seasons. In August, in situ maximum P n was 20 μmol kg −1 needle s −1 in the current‐year needles and 25 μmol kg −1 needle s −1 in the 1‐year‐old needles. Diurnal trends of P n in August were positively related to fluctuations in photosynthetic photon flux density (PPFD) and no midday depression of P n was found, indicating that a decrease in PPFD rather than an increase in needle‐to‐air vapor pressure deficit (Δ W ) might cause the reduction of P n . Both stomatal conductance ( g s ) and P n were lower in May than in August. In May, P n and g s were almost zero in the morning, but gradually increased with decreasing Δ W , reaching maximum P n values (4 μmol kg −1 needle s −1 ) and g s (60 mmol kg −1 needle s −1 ) at 16.00 hours. The daytime P n in May was positively related to g s . Relative water content in the exposed needles above the snow in May was 83%, which was far above the lethal level. This indicates that the water flow from stems or soils to needles was enough to compensate for a small amount of water loss due to the low g s in May, although the water supplied to needles would be impeded by the low temperatures. Thus, the reduced g s in May would be important for avoiding needle desiccation, and would result in a reduced P n ." @default.
- W2023472313 created "2016-06-24" @default.
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- W2023472313 date "2001-03-01" @default.
- W2023472313 modified "2023-10-03" @default.
- W2023472313 title "Diurnal changes in needle gas exchange in alpine <i>Pinus pumila</i> during snow‐melting and summer seasons" @default.
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- W2023472313 doi "https://doi.org/10.1046/j.1440-1703.2001.00376.x" @default.
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