Evaluation Of The Value Of Ecological Service Functions Of Different Forest Types

In this study,five typical forests in the Pujiang Country Park of Shanghai were selected as the research object.（Cinnamomum cam phora;Koelreuteria paniculata;Osmanthus fragrans;Sapindus mukorossi Gaertn;Taxodium ascendens Brongn.）Combining with the actual characteristics of the park and the feasibility of operation,Selecting 5 ecological service functions（adjust water volume,carbon fixation and oxygen release,preservation of fertility,purifying air,and wood-generating）for value assessment research by the forest within one year（2017.10-2018.10）,the purpose is to provide theoretical guidance and data support for the management and ecological protection programs of country parks.The assessment results are as follows:The sum of the value of the five forests ecosystem services selected in this study is745516.67 yuan·a^-1 under the premise of a total area of 6.62 hm²,equivalent to 112554.60yuan·hm^-2·a^-1。The contribution of Cinnamomum cam phora forest,Koelreuteria paniculata forest,Osmanthus fragrans forest,Sapindus mukorossi Gaertn forest,and Taxodium ascendens Brongn forest accounted for 14%,7%,26%,6%and 47%of the total value,respectively.In terms of the unit area（hm²）value,function of adjusting water volume and carbon fixation and oxygen release value of the forest are relatively large in the total value of the ecological service function.The sum of value of adjusting water volume and carbon fixation and oxygen release of each forest accounted for the total value of the unit area,Cinnamomum cam phora forest 83%,Koelreuteria paniculata forest 71%,Osmanthus fragrans forest 83%,Sapindus mukorossi Gaertn forest 77%,and Taxodium ascendens Brongn forest 70%.The proportion of forest to preservation of fertility and purifying air is small,and the sum of the two is between 4%and 9%.The order of the unit area value of Cinnamomum cam phora forest is carbon fixation and oxygen release（49291.73 yuan,50.5%）>adjusting water volume（31214.47 yuan,32.0%）>wood-generating（12645.59 yuan,13.0%）>preservation of fertility（2780.74 yuan,2.9%）>purifying air（1622.88 yuan,1.7%）.The order of the unit area value of Koelreuteria paniculata forest is carbon fixation and oxygen release（51235.56 yuan,50.9%）>wood-generating（25462.60 yuan,25.3%）>adjusting water volume（20050.15 yuan,19.9%）>preservation of fertility（2212.05 yuan,2.2%）>purifying air（1622.88 yuan,1.6%）.The order of the unit area value of Osmanthus fragrans forest is adjusting water volume（52277.94 yuan,53.8%）>carbon fixation and oxygen release（27426.95 yuan,28.2%）>wood-generating（11006.39 yuan,11.3%）>preservation of fertility（4901.53 yuan,5.0%）>purifying air（1622.88 yuan,1.7%）.The order of the unit area value of Sapindus mukorossi Gaertn forest is carbon fixation and oxygen release（53783.63 yuan,55.0%）>adjusting water volume（21037.91 yuan,21.5%）>wood-generating（18378.31 yuan,18.8%）>preservation of fertility（2930.84 yuan,3.0%）>purifying air（1622.88yuan,1.7%）.The order of the unit area value of Taxodium ascendens Brongn forest is carbon fixation and oxygen release（63835.04 yuan,46.9%）>adjusting water volume（31383.47 yuan,23.1%）>wood-generating（29494.96 yuan,21.7%）>preservation of fertility（6055.19 yuan,4.5%）>purifying air（5238.72 yuan,3.9%）.The value of unit area of adjusting water volume of Osmanthus fragrans forest is more significant.The value of unit area of adjusting water volume of Osmanthus fragrans forest is more significant.The value of the other four functions is most significant in.Taxodium ascendens Brongn forest.The value of adjusting water volume unit area is ranked as Osmanthus fragrans>Taxodium ascendens Brongn>Cinnamomum cam phora>Sapindus mukorossi Gaertn>Koelreuteria paniculata.The value of carbon fixation and oxygen release unit area is ranked as Taxodium ascendens Brongn>Sapindus mukorossi Gaertn>Koelreuteria paniculata>Cinnamomum cam phora>Osmanthus fragrans.The value of preservation of fertility unit area is ranked as Taxodium ascendens Brongn>Osmanthus fragrans>Sapindus mukorossi Gaertn>Cinnamomum cam phora>Koelreuteria paniculata The value of purifying air unit area is ranked as Taxodium ascendens Brongn>Cinnamomum cam phora=Koelreuteria paniculata=Osmanthus fragrans=Sapindus mukorossi Gaertn The value of wood-generating unit area is ranked as Taxodium ascendens Brongn>Koelreuteria paniculata>Sapindus mukorossi Gaertn>Cinnamomum cam phora>Osmanthus fragrans.