The purpose of this research is to examine the influence of urban forest thinning on the microclimate change by measuring the temperature and humidity, which are the most important microclimate parameters, of the forest before and after urban forest thinning. Two times of researches were conducted o...
The purpose of this research is to examine the influence of urban forest thinning on the microclimate change by measuring the temperature and humidity, which are the most important microclimate parameters, of the forest before and after urban forest thinning. Two times of researches were conducted on the status of plant appearance in each enumeration district in order to quantify the reduced forest biomass. as well as to measure the temperature and humidity data before and after urban forest thinning in the forest for comparison analysis. In order to extract data excluding the influence of the weather, we extracted the temperature difference(Tw) of the measured temperature and Automatic Weather Station(AWS) of Donglae-gu. Since AWS does not provide relevant humidity data, humidity was analyzed by converting Vapor Pressure Deficit(VPD) that consider temperature.
As a result of the analysis, the average daily temperature difference (Tw) immediately after forest making increased to 0.77°C on average, and the average daily temperature difference(Tw) 1 year after forest thinning increased by an average of 0.75°C, similar degree of increase in temperature. Such a trend was most evident during middays, and the trend in 1 year was more evident than that of immediately after forest thinning. The average temperature difference (Tw) in middays immediately after forest thinning was 0.74°C, while 1 year after forest thinning was 1.91°C, 2.5 times higher. The average temperature difference (Tw) at dawn had no statistical significance immediately after forest thinning until one year later when the temperature showed a drop of -0.17℃ , verifying the tendency of overall decrease in temperature. In case of humidity, while no difference was shown in daily average VPD 1 year after forest making, VPD decreased by an average of -0.37kPa at dawn and increased by 0.34kPa at midday, showing corresponding trend to the temperature. In addition, the Pinus rigida Mill. Vegetation was most sensitive to microclimate, showing the widest variation distribution range on both the temperature difference(Tw) and VPD within 95% confidence interval, In order to investigate whether these effects are due to the reduction of forest biomass, we analyzed correlation between basal area, crown area, canopy volume and the difference in temperature(Tw) and VPD. The result showed that the temperature difference(Tw) and VPD of canopy volume at midday both had a negative correlation, where it gets hotter and drier as temperature and VPD increase with the decrease of canopy volume.
In conclusion, forest thinning apparently has negative effect on microclimate, raising middays’ temperature and lowering humidity. Such result leads to an unstabilized microclimate and biological growth in the forest.
The purpose of this research is to examine the influence of urban forest thinning on the microclimate change by measuring the temperature and humidity, which are the most important microclimate parameters, of the forest before and after urban forest thinning. Two times of researches were conducted on the status of plant appearance in each enumeration district in order to quantify the reduced forest biomass. as well as to measure the temperature and humidity data before and after urban forest thinning in the forest for comparison analysis. In order to extract data excluding the influence of the weather, we extracted the temperature difference(Tw) of the measured temperature and Automatic Weather Station(AWS) of Donglae-gu. Since AWS does not provide relevant humidity data, humidity was analyzed by converting Vapor Pressure Deficit(VPD) that consider temperature.
As a result of the analysis, the average daily temperature difference (Tw) immediately after forest making increased to 0.77°C on average, and the average daily temperature difference(Tw) 1 year after forest thinning increased by an average of 0.75°C, similar degree of increase in temperature. Such a trend was most evident during middays, and the trend in 1 year was more evident than that of immediately after forest thinning. The average temperature difference (Tw) in middays immediately after forest thinning was 0.74°C, while 1 year after forest thinning was 1.91°C, 2.5 times higher. The average temperature difference (Tw) at dawn had no statistical significance immediately after forest thinning until one year later when the temperature showed a drop of -0.17℃ , verifying the tendency of overall decrease in temperature. In case of humidity, while no difference was shown in daily average VPD 1 year after forest making, VPD decreased by an average of -0.37kPa at dawn and increased by 0.34kPa at midday, showing corresponding trend to the temperature. In addition, the Pinus rigida Mill. Vegetation was most sensitive to microclimate, showing the widest variation distribution range on both the temperature difference(Tw) and VPD within 95% confidence interval, In order to investigate whether these effects are due to the reduction of forest biomass, we analyzed correlation between basal area, crown area, canopy volume and the difference in temperature(Tw) and VPD. The result showed that the temperature difference(Tw) and VPD of canopy volume at midday both had a negative correlation, where it gets hotter and drier as temperature and VPD increase with the decrease of canopy volume.
In conclusion, forest thinning apparently has negative effect on microclimate, raising middays’ temperature and lowering humidity. Such result leads to an unstabilized microclimate and biological growth in the forest.
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