TAILIEUCHUNG - Báo cáo lâm nghiệp: "Effect of shade net on stomatal conductance, photosynthesis, photochemical efficiency and growth of oak saplings"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài:"Effect of shade net on stomatal conductance, photosynthesis, photochemical efficiency and growth of oak saplings. | 279 Ann Sci For 1996 53 279-290 Elsevier INRA Original article Effect of shade on stomatai conductance net photosynthesis photochemical efficiency and growth of oak saplings K Gross 1 A Homlicher2 A Weinreich 1 E Wagner2 Institute of Silviculture 2 Institute of Biology II University of Freiburg 79104 Freiburg Germany Received 4 November 1994 accepted 22 December 1995 Summary The European oak species pedunculate Quercus robuT and sessile oak O petraea both considered to be light demanding were tested for their shade tolerance. Two- and 3-year-old nursery grown seedlings were planted either in the open field or with 50 reduction in sun irradiance in the spring of 1992. During the following 3 years growth was monitored. In the third summer the following ecophysiological parameters were measured stomatai conductance net photosynthesis photochemical efficiency of dark-adapted leaves as well as carotenoid and chlorophyll content stomatai conductance and photosynthesis were increased in the open field treatments while the shaded plants had larger leaves with fewer stomates per unit leaf area more chlorophyll per unit dry weight and increased chlorophyll carotenoid ratio. The photochemical efficiency of photosystem II as measured on dark-adapted leaves was 3-4 lower in the open field plants as compared to the shade grown ones. During the day it exhibited a decrease at noon in plants of both treatments this decrease recovered completely at the end of the afternoon. There was no difference in overall height of the plants between the two treatments however the root collar diameter was significantly smaller in the shade grown plants. Thus results of some other investigations according to which young oak plants grow better under shade could not be confirmed. Quercusl stomatai conductance net photosynthesis I photochemical efficiency shade tolerance Resume Effets de I ombrage sur la conductance stomatique I assimilation nette de co2 I efficience photochimique et la croissance de

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