Spatial and temporal changing patterns of temperature affected by typical urban plant community

Three typical plant communities of urban greenbelts, poplar forest, shrub and lawn were selected and air temperature measurements taken at varying distances from selected communities and at different heights, in order to learn the spatio-temporal pattern of change of air temperature around the plant communities. The results indicate that the 3 plant communities have the most significant impact on the surrounding air temperature in the afternoon hours (14:00～15:30), followed by the morning hours (10:00～11:30). However, at dusk (17:00～18:30), there is the reverse in air temperature around the poplar forest and shrub, and no significant effect is observed around the lawns. The impact of the 3 plant communities on air temperature weakens with increasing distance away from the communities. The impact intensity of poplar forest on the surrounding air temperature is 3.55 ℃, 1.48 times that of shrubs and 2.73 times that of lawns. The poplar forest also presents a stronger influence on the surrounding field air temperature, especially in the afternoon hours (14:00～15:30). The horizontal field of influence of poplar forest, shrub, and lawn is 14 m, 12 m and 8 m, and the vertical field of influence is 7.5 m, 3.5 m and 2.5 m, respectively.