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以经济林树种的5个不同品种(苹果、桃、梨、杏)为试材,应用CI-340超轻型便携式光合仪,测定了我国北方地区主要的经济林树种的叶片蒸腾作用,通过日蒸腾总量来确定不同树种蒸腾吸热和蒸腾降温值。结果表明:5种经济林果树品种的蒸腾作用、蒸腾吸热和降温增湿能力各不同,其中日蒸腾速率、吸热和降温增湿能力最大的是“XG丰水”梨(1.42mmol·m-2·s-1、2 941.26kJ·m-2·d-1、0.195 2℃);中等的是“红富士”苹果(1.18 mmol·m-2·s-1、2 499.80kJ·m-2·d-1、0.165 9℃)、“晚蜜”桃(1.22mmol·m-2·s-1、2 582.81kJ·m-2·d-1、0.171 4℃)、“龙王帽”杏(1.25mmol·m-2·s-1、2 622.27kJ·m-2·d-1、0.174 0℃);最小的是“串枝红”杏(1.01mmol·m-2·s-1、2 073.75kJ·m-2·d-1、0.137 6℃);5种经济林品种的日蒸腾吸热和日蒸腾降温均表现为,夏季(3 184.74kJ·m-2·d-1、0.211 3℃)>秋季(2 151.52kJ·m-2·d-1、0.142 8℃)>春季(1 975.29kJ·m-2·d-1、0.131 0℃)。此外,林木蒸腾速率的强弱和外界大气温度直接影响着其蒸腾吸热和蒸腾降温能力的大小。
Five different varieties (apple, peach, pear, apricot) of economic tree species were used as test materials. Leaf transpiration of the main economic forest species in northern China was measured by CI-340 ultralight portable photosynthesis apparatus. To determine the different species of transpiration endothermic and transpiration cooling value. The results showed that the transpiration, transpiration, endothermic and humidification abilities of five economic forest fruit varieties were different. Among them, the daily transpiration rate, endothermic and temperature-increasing and humidification capacity were the highest in “XG Feng Shui” Pear (1.42 mmol · m-2 · s-1,2 941.26 kJ · m-2 · d-1, and l.l95 2 ° C); moderate was “Red Fuji” apple (1.18 mmol · m -2 · s -1,2 499.80 kJ · M-2 · d-1, 0.1665 9 ℃), “late honey” peach (1.22 mmol · m -2 · s -1,2 582.81kJ · m -2 · d -1,0.171 4 ℃) “Dragon King” apricot (1.25mmol · m-2 · s-1,2 622.27kJ · m-2 · d-1, 0.174 0 ℃); the smallest is " · M-2 · s-1,2 073.75kJ · m-2 · d-1 and 0.1337 6 ℃). The daily evapotranspiration and daily transpiration of the five economic forest cultivars were as follows: summer (3 184.74 kJ · m -2 · d -1, 0.211 3 ℃)> autumn (2151.52kJ · m-2 · d-1, 0.1642 ℃)> spring (1 975.29kJ · m-2 · d-1, 0.131 ℃). In addition, the strength of forest transpiration rate and the outside air temperature directly affect the transpiration endothermic and transpiration cooling capacity.