Photosynthesis and leaf water potential of Dendrocalamus latiflorus planted at the Pangda royal station, Chiangmai province
2002
Nipon Chaisalee(Royal Forest Department, Bangkok (Thailand). Forest Research Office. Silviculture Research Division) | Watinee Thongchet(Royal Forest Department, Bangkok (Thailand)) | Pranom Chumriang(Kasetsart University. Bangkhen Campus, Bangkok (Thailand). Faculty of Forestry) | Ladawan Puangchit(Kasetsart University. Bangkhen Campus, Bangkok (Thailand). Faculty of Forestry) | Bunvong Thaiutsa(Kasetsart University. Bangkhen Campus, Bangkok (Thailand). Faculty of Forestry)
Present investigation was carried out at The Pangda Royal Station, Samoerng District, Chiangmai Province. The measurements were undertaken at 1 to 3-year old of Dendrocalamus latiflorus planted with 5*5 m spacing. Seasonal trends in photosynthetic rates measured in the afternoon and predawn leaf water potentials were studied in January-December 2000. The results showed that both photosynthetic rates and predawn leaf water potentials varied significantly among months, but not among the ages of clump. The photosynthetic rates measured during the dry season were doubled the rates measured during the wet season. Seasonal trends in stomatal conductance, photosynthetically active radiation, and leaf to air vapor pressure difference followed the pattern of photosynthetic rate. On the other hand, predawn leaf water potentials observed in the current study were higher in the wet season than those measured in the dry season. The lowest mean of predawn leaf water potential found in D. latiflorus was -0.30 MPa. The photosynthetic rates were found to be correlated with photosynthetically active radiation and stomatal conductance, but not with either predawn leaf water potential, or leaf to air vapor pressure difference, or leaf temperature.
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