[1]XUE Xue,YANG Jing,ZHENG Yunfeng,et al.Microclimate Characteristics of Liriodendron chinense×tulipifera Forest in Nanjing[J].Research of Soil and Water Conservation,2016,23(04):226-232.
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Microclimate Characteristics of Liriodendron chinense×tulipifera Forest in Nanjing

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 23 Number of periods: 2016 04 Page number: 226-232 Column: Public date: 2016-04-28
Title:
Microclimate Characteristics of Liriodendron chinense×tulipifera Forest in Nanjing
Author(s):
XUE Xue1,2, YANG Jing3, ZHENG Yunfeng4, ZHANG Jinchi1,2, ZHUANG Jiayao1,2, CHENG Jurong1,2, YANG Dan1,2
1. Soil and Water Conservation and Ecological Restoration Laboratory, Nanjing Forestry University, Nanjing 210037, China;
2. Collaborative Innovation Center of Sustainable China of Jiangsu Province, Nanjing Forestry University, Nanjing 210037, China;
3. Science Press, Beijing 100717, China;
4. East China Forestry Planning and Designing Institute, Hangzhou 310039, China
Keywords:
forest meteorology; microclimate; the meteorological monitoring system; Liriodendron chinense×tulipifera; urban forest
CLC:
S718
DOI:
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Abstract:
This study explored the microclimate characteristics of Liriodendron chinense×tulipifera forest on air temperature (Ta) and relative humidity (RH), further explored the effective influence mechanism on the urban environment in Nanjing,which was significant for guiding urban green space planning. Liriodendron chinense×tulipifera forest in Nanjing Forestry University was selected carefully as experimental sample and the cement ground was selected as control group. The Decagon micro-meteorological monitoring system was used to conduct long-term monitoring on solar radiation, air temperature, relative humidity and other microclimate factors as well. They were recorded every half an hour from March of 2013 to February of 2014. The results showed that the adjusting effects of Liriodendron chinense×tulipifera forest on air temperature and humidity were different in terms of seasons, the Ta of forest land during spring, summer and autumn in the daytime were unexceptionally lower than that of cement ground, as long as they were slightly higher at night than that of cement ground, the RH of forest land during summer and autumn in the daytime were unexceptionally higher than those of the cement ground, while lower at night. However, the daily range and daily variation coefficient of cement ground were higher than those of forest land. The most significant cooling effects showed in summer at 11:00 and cooling effects of forest land were less than the cement ground at night. Secondly, the adjusting effects of urban forest on air temperature and humidity were different in terms of months. From June to September, Ta of the forest land and cement ground differed obviously, and daily average temperature was significantly lower than the cement ground. In February, forest land had the best nocturnal warming effect. From July to September, the difference between forest land and cement ground of monthly average RH was much more significantly than any other months. From April to November, monthly Ta range and variation coefficient forest land were lower than those of cement ground, as well as the monthly RH range and variation coefficient from June to November. The yearly range and variation coefficient of cement ground were slightly higher than those of forest land. In terms of frequency of maximum and minimum values, the time of occurrence on maximum Ta was postponed for about 2.5 hours, as long as the time of occurrence on minimum was delayed about half an hour. What’s more, the Ta and RH showed a significant linear relationship, with the rules of high Ta and lower RH, low Ta and high RH. The study concluded that Liriodendron chinense×tulipifera forest played the significant roles in adjusting humidification efficiency and cooling effects. Liriodendron chinense×tulipifera forest has the abilities of delaying extreme temperature as well. On cold night during autumn and winter, Liriodendron chinense×tulipifera forest could maintain the surrounding environment higher air temperature and warmer than the cement ground, and further keep the changing of the RH and Ta more smoothly and less fluctuation than the cement ground. What’s more, the Ta and RH could influence each other dramatically. The microclimate forest land could affect the microclimate of cement ground as also, like Ta, RH and solar radiation.
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