Evaluation Of Ecological Health Functions Of Typical Urban Forests In Yinchuan

The ecological health care function of urban forest is an important part of forest ecosystem service function.Therefore,the research and evaluation of forest ecological health care function is of great significance to people’s scientific understanding of forest use,reasonable arrangement of rest and recreation time,protection of forest environment,and maintenance of ecosystem balance.In this study,three typical urban forest park botanical gardens,Fenghuang Park and Huabo Garden in Yinchuan were selected to conduct all-weather uninterrupted monitoring of environmental factors,pollutant concentrations and air negative oxygen ion concentrations at the three monitoring points.Based on the survey on the vegetation community status in the forest environment in Yinchuan City,combined with the monitoring data,the health function and comprehensive comfort index of typical urban forest ecology in Yinchuan City were comprehensively analyzed and evaluated,and a scientific,reasonable and accurate evaluation was made.The research results show that:(1)Through the investigation of the three monitoring sites and surrounding plant communities,the results show that the average tree height of Yinchuan Botanical Garden is 3.37 m,the average DBH is 6.20 cm,the stand density is 1591 plants·hm-2,the canopy density is 0.84,and the arbor layer The Margalef index and the shrub layer are 1.54 and 1.024,respectively,and the Simpson index is 0.693 and 0.796,respectively;the arbor forest in Fenghuang Park is mainly plantation,mainly poplar and willow,with sparse shrubs and herbs,the average tree height is 5.20 m,and the average diameter at breast height is 5.20 m.is 8.72 cm,the stand density is 1083 plants·hm-2,the canopy closure is 0.53,the Margalef index of the arbor layer and the shrub layer are 0.720 and 0.910,respectively,and the Simpson index is 0.538 and 0.998,respectively;The Huabo Garden average tree height is 7.21 m,the average diameter at breast height is 14.51 cm,the stand density is 817 plants·hm-2,the canopy density is 0.66,and the Margalef index of the tree layer and shrub layer are 1.020,respectively.and 0.220,the Simpson indices were 0.707 and 0.997,respectively.(2)The comprehensive comfort index of Yinchuan Botanical Garden,Fenghuang Park and Huabo Garden were 11.94,11.70 and 11.75,respectively,SO2 concentrations were 0.0366 ppm,0.0284 ppm and 0.0228 ppm,and PM2.5 concentrations were 0.0815 mg·m-3 and 0.0624 mg·m-3 and 0.0325 mg m-3,NO2 concentrations were 0.0346 ppm,0.0254 ppm and 0.0181 ppm,and negative oxygen ion concentrations were 684.44 cm-3,735.35 cm-3 and 716.96 cm-3.(3)The urban forest ecological health care function in Yinchuan presents regular daily and annual changes.From the perspective of daily changes throughout the year,the Botanical Garden has the best outdoor comfort,and the outdoor comfort of Fenghuang Park and Huabo Garden is not much different,both of which are most comfortable between 12:00-14:00;The highest level of outdoor comfort is in summer,followed by autumn,and there is no outdoor comfort period throughout winter.(3)The urban forest ecological health care function in Yinchuan presents regular daily and annual changes.From the perspective of daily changes throughout the year,Yinchuan Botanical Garden has the best outdoor comfort,and the outdoor comfort of Penghuang Park and Huabo Garden is not much different.The most comfortable time period for the three monitoring points is 12:00-14:00;In terms of changes,the highest outdoor comfort is in summer,followed by autumn,and there is no time for outdoor comfort throughout winter.(4)The correlation between the forest ecological health care functions in Yinchuan was analyzed,and the negative oxygen ions in the air of the Botanical garden in winter were significantly negatively correlated with humidity(P<0.05);the comprehensive comfort of Fenghuang Park was significantly positively correlated with the negative oxygen ions in the air(P<0.05),the negative oxygen ions in the air in summer were significantly negatively correlated with temperature and humidity(P<0.05),and the comprehensive comfort of the Huabo Garden was significantly positively correlated with the negative oxygen ions in the air(P<0.05),and the negative oxygen ions in the air were significantly positively correlated(P<0.05).There was also no significant correlation with environmental factors.The daily variation results of the comprehensive evaluation show that the time periods of 03:00-07:00 and 20:00-22:00 are moderate or above for human comfort;the seasonal variation results of the comprehensive evaluation show that the three monitoring points are the highest in summer,followed by It is autumn,lower in winter and spring.Ranking the urban forest comprehensive health care index of the three monitoring points,the results are:Botanical Garden>Huabo Garden>Fenghuang Park.It shows that the comprehensive health care function of the Botanical Garden is the best,followed by the Huabo Garden,and the Fenghuang Park is the lowest.