茅台酒厂生态功能区4种优势树种光合特征比较

Comparison of Photosynthetic Characteristics of 4 Dominant Tree Species in Maotai Liquor Production Area

以茅台酒厂生态功能区4种优势树种为材料,通过光合作用系统仪测定夏、冬两季光合作用日变化,进而评价树种对环境的适应性。结果表明,各树种上午的净光合速率(Pn)高于下午,暗呼吸速率(Rd)和光能利用率(LUE)无明显变化规律;对Pn日均值而言,在夏季,青冈栎显著高于箬竹、复羽叶栾树和构树,而在冬季,复羽叶栾树显著高于青冈栎、箬竹和构树;从夏冬两季总的Pn来看,青冈栎最高(6.90μmol/(m2·s)),构树最低(2.34μmol/(m2·s));复羽叶栾树的总Rd显著高于青冈栎、箬竹和构树,而青冈栎的总LUE最低。根据几个光合生理参数指标,该地区几种优势树种的适应能力表现为青冈栎>复羽叶栾树>箬竹>构树。

4 dominant tree species in the Maotai liquor production area were analyzed their photosynthetic characteristics of diurnal variation in summer and winter by using a portable photosynthesis system LI-6400,and then evaluated the acclimation of these species to environment.The results showed that net photosynthesis rate （Pn）of tree species were higher in morning than those in afternoon,but dark respiration rate （Rd）and light use efficiency （LUE）had not evident changing-regular.Diurnal mean values of Pn were higher in Cyclobalanopsis glauca than those in Indocalamus tessellatus,Koelreuteria bipinnata and Broussonetia papyrifera in summer.In contrast,Diurnal mean value of Pn were higher in K.bipinnata than those in C.glauca,I.tessellatus and B.pa-pyrifera in winter.Gross Pn in summer and winter was the highest for C.glauca （6.90 μmol/（m2 ·s））and was the lowest for B.papyrifera （5.35 μmol/（m2 ·s））.Gross Rd in K.bipinnata was higher than those in C. glauca,I.tessellatus,B.papyrifera.Gross LUE was the lowest for C.glauca.According to the parameters of photosynthetic physiology, the acclimation of these species to environment was C.glauca 〉K.bipinnata 〉I.tessellatus〉B.papyrifera.