Nanjing City Landscaping Broadleaf Tree Species Of Photosynthetic Characteristics And Associated Ecosystem Functions

In this paper,Nanjing city common 18 kinds of garden arbor large study photosynthetic activities and related ecological benefits of using the LI-6400XT Photosynthesis,determination of net photosynthetic rate of evergreen and deciduous trees large net transpiration rate,calculated by the solid species carbon and releasing oxygen,the amount of cooling humidifiers,water use efficiency,combined with species of leaf area index and quantitative evaluation of species of ecological benefits,provide a theoretical basis for the planning and configuration of Nanjing city tree species ecological garden construction.The main results are as follows:1.leaf area index for the test species vary greatly;index based on the size of the sort can be divided into third gear,the leaf area index>6.0 are Lang Yu,acuminata,Chinese tallow tree,sycamore,etc;leaf area index of 4.5 to 6.0 with a thin pecan shell,with no son,Ash,Chongyang wood,hackberry,hybrid Tulip,Ailanthus,Calligonum,maple,sycamore;LAI 3.0-4.5 are Magnolia,Melia,magnolia,camphor.2.The majority of the net photosynthetic rate of the test species in the summer there are obvious midday depression in spring and autumn there are differences depending on the species.Most trees in the summer of transpiration rate is the largest,followed by the spring;evergreen species in winter minimum.Trees daily carbon fixation and oxygen release deciduous trees 3.sort of test for the tree>Sapindus>Lang Yu>Hackberry>maple>acuminata>Tallow>Sycamore>Ailanthus>pecan>Calligonum>Hybrid Tulip>sycamore>Magnolia>Chongyang wood>Melia;as evergreen Magnolia grandiflora>camphor.In total fixing carbon and releasing oxygen as a deciduous tree Species>Sapindus>Lang Yu>Hackberry>maple>acuminata>Tallow>pecan>Sycamore>Ailanthus>sycamore>Calligonum>Chongyang wood>Hybrid jacket wood>Magnolia>Melia;evergreen species Magnolia grandiflora>camphor.Daily and annual carbon sequestration and oxygen release is substantially greater than the evergreen deciduous tree species.4.Overall humidification ability test species can be divided into three categories:the ability of the species are hackberry,Lang Yu,Chong wood,Ash,with no son;abilities of species are maple,pecan,sycamore,acuminata,magnolia,Ailanthus,the Indus,tallow,hybrid Liriodendron;less capable species are neem,camphor,Magnolia,Calligonum.Summer cooling capacity is substantially greater than the evergreen deciduous tree species.5.Water Use Efficiency of large evergreen trees in winter maximum and summer minimum;large deciduous trees in the most efficient water use in spring and evergreen trees mean water use efficiency than large deciduous trees high.