Study On The Difference Of Healthy And Nutrition Factors In Different Forest Types

Forest and human health is a kind of health-care concept and health-care model that has emerged in recent years.The development of forest and human health can play a health care role in people’s physical and mental health.This study is based on six different forest types in the Shimen National Forest Park in Conghua District,Guangzhou(subtropical monsoon evergreen broad-leaved forest,bamboo forest,flower grassland,coniferous and broad-leaved mixed forest A(mixing ratio 5:5),coniferous forest,Coniferous and broad-leaved mixed forest B(mixing ratio 4:6))as the main test base,and three experimental sites(Hua Nong Arboretum,Huanong Grand Lawn,Wushan Street Intersection)in Guangzhou City were also selected as reference controls.To analyze the difference of phytoncidere,air negative charge ions concentration,air oxygen content and other physical factors such as microclimate environment and noise in different forest types,explore their changing laws,and comprehensively evaluate the types of different forest types.The purpose of health care is to provide reference guidance for human health activities,and to provide a scientific basis for the construction of healthy and nutrition Forest in Guangdong Province and the construction and planning of health care bases.The specific research results are as follows:(1)There are significant differences in the types and contents of phytoncidere between different forest types.The types and contents of plant essence collected in different forest types are:6 kinds of bamboo forest,relative content 31.49%,subtropical monsoon evergreen broad-leaved forest 3,relative content 30.00%,coniferous and broad-leaved forest B(mixing ratio)4:6)Category 2,relative content of 20.15%,coniferous and broad-leaved mixed forest A(mixing ratio of 5:5)4,relative content of 0.4%,coniferous forest 1 type,relative content of 0.14%.The results showed that the order and type of essential oils of different forest types were as follows:bamboo forest>subtropical monsoon evergreen broad-leaved forest>coniferous and broad-leaved mixed forest B(mixing ratio 4:6)>coniferous and broad-leaved mixed forest A(mixing ratio 5:5)>Coniferous forest.(2)There are significant differences in the concentration of air negative charge ions between different forest types.1 Results:The concentration of negative charge ions in the mid-subtropical monsoon evergreen broad-leaved forest of Shimen National Forest Park in Conghua District of Guangzhou City is the highest,with an average of 2488 pieces/cm~3,and the highest month is 3583 pieces/cm~3.The intersection of Wushan Street intersection in Guangzhou City is negative.The charge ion concentration is the lowest,with an average of512 pieces/cm~3,and the lowest month is only 400 pieces/cm~3.The order of negative charge ion concentration of different forest types from high to low is:subtropical monsoon evergreen broad-leaved forest(2488 pieces/cm~3)>coniferous and broad-leaved mixed forest B(mixing ratio 4:6)(1267 pieces/cm~3)>bambooforest(1117 pieces/cm~3)>Coniferous forests(1058pieces/cm~3)>Coniferous and broad-leaved mixed forests A(mixing ratio 5:5)(722pieces/cm~3)>Flower grass quilts(694 pieces/cm~3)>Huaong Arboretum(672 pieces/cm~3)>Hua Nong Lawn(606 pieces/cm~3)>Wushan Street intersection(512 pieces/cm~3).The concentration of negative oxygen ions in all forest types of Shimen National Forest Park is higher than that in Guangzhou.2 Shimen National Forest Park had the highest concentration of negative charge ions in July,with an average of 1566 pieces/cm~3.The concentration of negative charge ions in Guangzhou was the highest in November,with an average of 751pieces/cm~3,which was lower in August and February,with an average of 426 pieces/cm~3 and451 pieces/cm~3.The average concentration of negative charge ions in Shimen National Forest Park is higher than that in Guangzhou.The seasonal variation of negative charge ion concentration in Shimen National Forest Park is:summer(1389 pieces/cm~3)>autumn(1078pieces/cm~3)and winter(1120 pieces/cm~3).The seasonal variation of negative oxygen ion concentration in Guangzhou is:winter(642 pieces/cm~3)≈autumn(605 pieces/cm~3)>summer(448 pieces/cm~3).3 The concentration of negative charge ions in the forest area will be significantly reduced after the typhoon;the concentration of negative charge ions in the air in the foggy weather is very low;temperature high or low will affect the concentration of negative charge ions;Trees affect the concentration of negative charge ions significantly;the negative charge ion concentration of the forest edge is significantly lower than that of the forest.(3)There are significant differences in oxygen content between different forest types.By measuring and correcting the oxygen content in different forest types,the order of oxygen content of different forest types from high to low is:bamboo forest(21.88%)>flower grass(21.87%)>subtropical monsoon evergreen broad-leaved forest(21.86%)>Coniferous and broad-leaved mixed forest A(mixing ratio 5:5)(21.85%)>coniferous forest(21.25%)>coniferous and broad-leaved mixed forest B(mixing ratio 4:6)(21.19%).The seasonal variation of oxygen content shows:summer>autumn>winter season.(4)There are significant differences in climate comfort between different forest types.By measuring the temperature,humidity and wind speed in different forest types,combine with the comfort evaluation formula and standard table,the results of the different comfort grades of different forest types are:bamboo forest=flower grassland>coniferous forest>subtropical monsoon evergreen Broad-leaved forest>Coniferous and broad-leaved mixed forest B(mixing ratio 4:6))>Coniferous and broad-leaved mixed forest A(mixing ratio 5:5)=Huanong Arboretum>Wushan Street intersection=Huanong Lawn.(5)There are significant differences in noise values between different forest types.The average noise level in Shimen National Forest Park is 45.09 d B,and the average noise level in Guangzhou is 59.79 d B.The order of noise values from high to low is:Wushan Street intersection(68.99 d B)>Huanong Lawn(55.97 d B)>Huanong Arboretum(54.41d B)>Flower Grassland(50.31 d B)>Coniferous and broad-leaved mixed forest A(mixing ratio)5:5)(49.21 d B)>bamboo forest(47.07 d B)>Subtropical monsoon evergreen broad-leaved forest(45.85 d B)>Coniferous and broad-leaved mixed forest B(mixing ratio 4:6)(40.52 d B)>Coniferous forest(37.58 d B)).The difference between the noise value outside the forest and the noise value in the forest is regarded as the noise reduction value.This value is used to evaluate the noise reduction effect of different forests.The order of noise reduction from high to low is:subtropical monsoon evergreen broad-leaved forest(4.5 d B)>Bamboo Forest(3.28 d B)>Coniferous and broad-leaved forest B(mixing ratio 4:6)(2.26d B)>Coniferous and broad-leaved mixed forest A(mixing ratio 5:5)(0.62 d B)>Flower grass(0.04 d B).(6)There are significant differences in air quality between different test sites.The air quality of Shimen National Forest Park is the best.The results of major pollutants are far below the first-level limit of GB3095-2012 Ambient Air Quality Standard.The air quality at Wushan Street intersection is the worst,PM2.5,PM10 and other air.The pollutants exceed the first-level limit of the ambient air quality standard.In September and December,the results of the air quality measurement are the same:Shimen Forest Park>Huanong Arboretum>Wushan Street intersection.According to the above studies,there are significant differences in the health factors of different forest types.In general,the health factors and physical environment of subtropical monsoon evergreen broad-leaved forest,bamboo forest and coniferous and broad-leaved mixed forest B(mixing ratio 4:6)are superior to coniferous forest,coniferous and broad-leaved mixed forest A(5:5),flower and grassland,and the overall health and nutrition factors and physical environment of Shimen National Forest Park is better than that in Guangzhou.The larger the forest area and the higher the forest coverage rate,the larger the ratio of virgin forests and the better the local health factors of the more abundant plant species.The construction of the base should be planned near the prineral forest that rich in plant speciesand with a high degree of closure.