鄱阳湖流域典型树种夏季气孔导度模型及影响因素比较  

Stomatal Conductance Models of Typical Tree Species in the Basin of Poyang Lake in Summer and Comparison of Their Influencing Factors

作　　者：石建红[1,2,3] 周锁铨[1,2] 余华[4] 孙善磊[1,2] 荆大为[1,2] 

机构地区：[1]南京信息工程大学,气象灾害省部共建教育部重点实验室,江苏南京210044 [2]南京信息工程大学大气科学学院,江苏南京210044 [3]温州市气象局,浙江温州325027 [4]南京大学国际地球系统科学研究所,江苏南京210093

出　　处：《环境科学研究》2010年第1期33-40,共8页Research of Environmental Sciences

基　　金：国家自然科学基金项目(40775061/D0507);江苏省气象灾害重点实验室项目(KLME050212)

摘　　要：植物气孔是调控土壤-植被-大气连续体间物质和能量交换的关键环节,其变化对植物蒸腾作用有着重要的影响,进而对环境湿度和温度等起着重要的调节作用.基于鄱阳湖流域5种典型树种叶片气体交换观测数据,对14种组合的气孔导度模型〔Jarvis模型12种,Ball-Berry-Leuning(BBL)模型2种〕的参数进行了拟合,筛选出5种典型树种夏季最优气孔导度模型;结合多元逐步回归技术,分析了大气温度(Ta)、叶片与空气间饱和水汽压差(De)、光合有效辐射(PAR)、大气CO2浓度(Ca)4种环境因子对气孔导度的影响.结果表明:杉木(Cunninghamia lanceolata)、湿地松(Pinus elliottii)、马尾松(Pinusmassoniana)的最优模型均为BBL-B2模型;沉水樟(Cinnamomum micranthum)的最优模型为BBL-B1模型;柑桔(Citrusreticulata)的最优模型为Jarvis-J12模型;饱和水汽压差(De)为影响鄱阳湖流域5种典型树种夏季气孔导度的最敏感因素.The stomata of plants play an important role in regulating matter and energy transfer among soil, vegetation and the atmosphere. Changes of stomata significantly influence plant transpiration, and additionally adjust the environmental humidity and temperature. Based on the data of leaf level gas exchange, which was measured in summer in Poyang Lake Basin for five representative species, we fitted the parameters of 14 different models （ 12 types of Jarvis models and two types of Ball-Berry-Leuning （BBL） models） to select the best stomatal conductance model for each species. The multiple stepwise regression method was used to analyze the influence of the four environmental variables （ temperature （ Ta ） , leaf-atmosphere vapor pressure deficit （ D ） , photosynthetic active radiation （PAR） , and atmosphere CO2 concentration （Co） ） on the stomatal conductance （G,）. It was concluded that BBL-B12 was the best model to describe the G of Pinus elliottii, Cunninghamia lanceolata, and Pinus massoniana, while BBL-B1 was the most perfect model for Cinnamomum micranthum, and Jarvis-J12 was the most suitable model for Citrus reticulata. Leaf-atmosphere vaporpressure deficit （Da） was the most significant variable affecting the G, of all the species in summer.

关 键 词：气孔导度 Jarvis模型 Ball—Berry—Leuning模型 鄱阳湖流域 

分 类 号：X17[环境科学与工程—环境科学]