Effects of composition and spatial distribution of patches on microclimate in the urban riparian zone：a case study of riparian zone along Yongding River in Beijing

doi:10.7523/j.issn.2095-6134.2020.05.005

Abstract

Abstract: We discuss the effects of composition and spatial distribution of patches on microclimate in the riparian zone from Mencheng Lake to Lianshi Lake along Yongding River in Beijing. In August 2017, we measured the three microclimate indexes, land surface temperature (LST), air temperature (TP), and relative humidity (RH), within each vegetation patch in the morning, at noon, and at dusk, respectively, on the same sunny days.Redundancy analysis and stepwise regression analysis are used to determine the main factors affecting the three microclimate indexes for different vegetation patch types and how they affect. The results show that, compared with roads, plants significantly reduce LST and TP and increase RH within the vegetation patches. However, the differences among the three vegetation patch types are not significant. LST, TP, and RH at the three times are affected by the characteristics of both vegetation patches themselves and their adjacent patches. However, these relationships at the same time are not always the same for different vegetation patch types. At noon, as the height of herb increases by 0.1 m, LST within herb patches reduces by 5.11%. As the shrub coverage increases by 10%, TP within shrub patches reduces by 2.50% and RH increases by 10.82%. As the adjacent tree coverage increases by 10%, LST within the mixed herb and broad-leaved patches and the herb patches reduces by 8.26% and 44.98%, respectively. As the adjacent road area increases by 10%, LST within the mixed herb and broad-leaved patches increases by up to 6.00%. As the distance from the river decreases by 10 m, RH within herb patches and shrub patches increases by up to 9.32% and 2.01%, respectively. In general, the index interactions or additions among different patches have more significant influence on microclimate than single patch index. The results provide useful information for ecological restoration of riparian zone and landscape design and planning.

Key words: urban riparian zone, land surface temperature, air temperature, relative humidity, patch composition, spatial distribution, adjacent patch

CLC Number:

TU986

WANG Xin, ZHANG Na, YUE Rongwu, ZHENG Xiaorou. Effects of composition and spatial distribution of patches on microclimate in the urban riparian zone：a case study of riparian zone along Yongding River in Beijing[J]. , 2020, 37(5): 606-618.

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