7个茶树新品种不同供水水平的光合特性比较

Photosynthetic Characters of Seven New Tea Plant Varleties under Different Soil Moisture Levels.

在３种土壤水分（高湿、中湿和低湿）条件下，研究了新育成品种浙农１２１、苹云、龙井长叶、浙农１１３、菊花春、碧云及国家级良种福鼎大白茶等７个茶树品种的光合特性。结果表明：①浙农１２１和浙农１１３两个品种在各种供水条件下的净光合速率（Ｐｎ）、蒸腾速率（Ｔｒ）和气孔导度（Ｇｓ）３个参数数值大，光合特性优；高湿条件下，苹云和龙井长叶也表现较优；中湿条件下，苹云与碧云光合特性较优；低湿条件下，福鼎大白茶显示出较好的光合特性。②Ｔｒ与Ｇｓ呈极显著正相关，在高湿与低湿条件下，Ｐｎ与细胞间隙ＣＯ＿２浓度（Ｃｉ）呈负相关；中湿条件下，Ｔｒ与Ｃｉ和Ｇｓ与Ｐｎ呈显著正相关，Ｔｙ与Ｐｎ和Ｇｓ与Ｃｉ呈极显著正相关。

Under the conditions of high, medium and low moisture,photosyn-thetic characters of seven tea plant varieties including six new varieties ofZhenong121, Pingyun, Longjingchangye,Zhenong 113,Juhuachun, Biyun andone nat ional improved tea variety Fuding-dabaicha were studied. The resultsindicated that: 1.Under different soil moisture levels, the net photosynthesisrate(Pn),transpiration rate(Tr)and Stomatal conductance(Gs)values of Zhe-nong 121,Zhenong 113 were high with excellent photosynthetic characters;Under high soil moisture level, photosynthetic characters of Pingyun and Long-jingchangye were quite good; Uilder medium soil moisture level, photosyn-thetic characters of Pingyun and Biyun were quite good; Under lower soil mois-ture level,photosynthetic characters of Fdingdabaicha were quite good. 2.Tr was significant correlated with Cs. Under the highand lower soil moisture levels,Pn was nagative correlated with Ci(carbon dioxide concentration among lacunae) Under medium soil moisture level,Tr was significant correlated with Ci,and Gs was significont correlated with Pn;Tr was significant cor-related with Pn,and Gs was highly significant correlated with Ci.