| The purpose of this paper is to quantitatively study the influence of forest land on the microclimate of residential area.Through a large number of field survey and meteorological indicators,combined with the ecological field theory,the impact of different landscape proportions on residential areas is studied,and the landscape ratio is further studied.The relative optimal results of the microclimate impact were obtained,and the thresholds of the proportion of the landscape to be controlled for the effect of forest land on the microclimate in the residential area were obtained.At the same time,the difference between the different area and the form forest land on the microclimate Construction of residential areas,to improve the residential area of small climate comfort to provide specific quantitative forest land construction indicators and theoretical guidance,the following conclusions:(1)The target survey has a total of five residential groups,each residential group green rate and forest cover are more than 40%,the proportion of woodland from large to small order: Jingyuan> Longhu Xiyuan> Jingyuan> Shangyuan impression> Fenglin Xiushui;investigation The average daily temperature of the five residential groups in the region was lower than that of the control plot.The average daily temperature of the five groups was 6.09 ?,and the lowest temperature was 2.73 ?.The average daily temperature of the five residential areas And the weather temperature difference from large to small order: Jingyuan> Longhu Xiyuan> Yi Yuan> Shang source impression>Fenglin Xiushui,Jingyuan day maximum temperature reduction is also the highest,reaching 8.4 ?;but the minimum temperature difference The difference between the five residential areas is not large.In the temperature of the day,the temperature trend of the five communities is the same,the temperature rises rapidly from 9:00 to 15:00,reaches the maximum temperature before and after 15:00,and then the temperature decreases slowly.The change of the humidity at day is opposite to the temperature,The overall trend is low on both sides of the high school,the survey period of the maximum humidity of 9:00,the minimum humidity time is 15:00.The climate comfort index of each residential group is from small to large order: Jingyuan <Longhu Xiyuan <Yi Yuan<Shang source impression <Fenglin Xiushui;and by the comfort index can be givenJingyuan and Longhu Xiyuan residential area thermal environment The highest comfort,Shangyuan impression and Yiyuan residential area hot environment comfortable moderate,for the warm,are acceptable range of more comfortable,and Fenglin Xiushui residential area hot environment comfort evaluation for the hot,not suited.(2)The proportion of woodland is the main determinant of the difference in temperature and humidity within the scope of investigation.The higher the proportion of woodland,the lower the temperature of the corresponding sample,the higher the humidity,and the higher proportion of building and the proportion of road and hard pavement.So that the temperature increase in humidity,in urban construction,within the allowable range of reasonable increase in the proportion of woodland,the appropriate reduction in the proportion of construction and hard pavement,is conducive to cooling and humidification,improve microclimate.The edge effect is more obvious,and the maximum temperature edge effect is1.45 ?,that is,the proportion of the same forest land is lower than that of the marginal forest land,and the marginal effect is higher than that of the marginal forest land.The average effect of high 0.51 ?,the maximum can reach 1.45 ?,the relative humidity of the largest edge difference of 1.74%,the average relative humidity increase difference of 0.9%.(4)Based on the correlation between forest land ratio and temperature and humidity,it can be concluded that there is a significant positive correlation between forest land ratio and temperature decrease and humidity increase,and the proportion of woodland can be effectively cooled and humidified.This effect is especially when the proportion of woodland is not high Significantly,when the woodland coverage is less than 40%,for every 10% increase,the maximum temperature can reach 0.72 ?,when the woodland coverage is less than 45%,each increase of 10%,humidity increase of up to 1.51%.However,when the proportion of woodland reached more than 40%,the proportion of temperature decreases with the proportion of forest land,the effect is not much,while the proportion of woodland reached more than 45%,the degree of humidity increases with the proportion of woodland also has little effect,so the proportion of woodland The optimal value should be 40 ~ 45% interval,to achieve the best effect of humidification cooling.(5)There was a significant positive correlation between the area of woodland and the area of woodland,and the increase of temperature was 0.78 ? and the humidity increased by 1.89%.When the forest area was less than 500m2,there was no obvioustemperature and humidity field,When the forest area is more than 500m2,the woodland area has a significant positive correlation with the ecological potential,ecological range and ecological field gradient of the temperature and humidity ecological field.The forest area is increased by 1000 ?,and the increase of forest area can effectively improve the temperature and humidity Field potential,expand the scope of temperature and humidity ecological field,increase the ecological gradient.At the same time,in order to ensure the comprehensive improvement of the effect of forest area on the effect of temperature and humidity ecological field,the forest area should be guaranteed at 3300m2,which can effectively and effectively exert the effect of woodland on the surrounding humidification.At this time,The area of humidification is14.5%,the temperature is 3.2 ?,the humidification is 6%,the influence of temperature drop is 13.2m,and the influence of humidification is 14.1m.(6)The smaller the temperature of woodland is,the less the temperature of woodland is,and the wetting effect of woodland is less significant.The ecological field effect of different perimeter is shown in Fig.4-39 and Fig.4-40.,The longer the circumference of its temperature and humidity field of ecological field is greater,while its ecological potential also increased to a certain extent,the forest within 5m cooling rate also has a certain increase,so the same area,the circumference of smaller circular square forest plaque Has a better forest ecological field effect,the cooling effect is more obvious. |
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