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地表覆盖对局部环境热效应的贡献
郑燚, 李素艳, 孙向阳, 李啸冲, 周伟, 范志辉, 田琴
北京林业大学 林学院, 北京 100083
摘要:
[目的] 分析3种下垫面(裸露砂壤土、红色摩奇覆盖和黄色摩奇覆盖)夏季(6—8月)的地表温度和气温之间的变化规律,为减缓城市环境热效应和优选有机覆盖材料提供科学参考。[方法] 采用地表气象资料观测法,使用手持红外热像仪对3种下垫面的地表温度进行观测,同时记录实时温湿度仪的气温数据;分析它们对局部环境热效应贡献的影响情况和变化特征。[结果] ①夏季3种下垫面的地表温度与气温变化较为同步,它们对局部环境热效应贡献大小依次为:裸露砂壤土 > 红色摩奇覆盖 > 黄色摩奇覆盖。②7月期间,摩奇覆盖虽然一定程度上减缓了热效应但不显著。6月和8月期间表现为黄色摩奇覆盖对热效应减缓作用显著,红色摩奇覆盖减缓作用不显著(p<0.01)。③对3种下垫面地表温度和气温进行回归分析,发现它们之间存在很明显的线性关系(R2 > 0.95),可利用模型检验预测下垫面地表温度。[结论] 对城市环境中土质较差且难以形成绿地的裸露砂壤土采取有机覆盖措施,可减缓夏季局部环境的热效应,建议选择黄色等浅色覆盖材料。
关键词:  覆盖  热效应  下垫面  裸露砂壤土  有机覆盖材料
DOI:10.13961/j.cnki.stbctb.2020.04.027
分类号:S731.2
基金项目:北京市科技计划课题“北京市绿地林地土壤质量提升关键技术研究与示范”(Z161100001116061);北京市园林绿化局项目“有机覆盖物在园林绿化建设中的应用关键技术研究与示范”(HXLD-2019-037)
Contribution of Land Mulching to Local Environmental Thermal Effects
Zheng Yi, Li Suyan, Sun Xiangyang, Li Xiaochong, Zhou Wei, Fan Zhihui, Tian Qin
College of Forestry, Beijing Forestry University, Beijing 100083, China
Abstract:
[Objective] In order to provide scientific references for mitigating urban thermal effect and optimizing organic mulch materials, effects of three kinds of land surfaces (bare sandy loam, red mulch, and yellow mulch) on local temperature during summer (June to August) were analyzed. [Methods] Using the surface meteorological data observation method, land surface temperature of the three underlying surfaces was measured with a handheld thermal imagine camera, and air temperature was recorded by a real-time thermohy grometer. The influence and variation characteristics of their contribution to local environmental thermal effect were analyzed. [Results] ① Temperature dynamics of local air and the three land surfaces were synchronized. Thermal effect on local environment was ranked in the following order: bare sandy loam > red mulch > yellow mulch. ② During July, the mulch moderated the thermal effect to some extent but not significantly. While both yellow mulch and red mulch could reduce heat, significant differences (p<0.01) was only found with yellow mulch for the months of June and August, when compared to bare sandy loam. ③ Regression analysis to the surface temperature and air temperature of the three underlying surfaces indicated a linear relationship between land surface and air temperature (R2 > 0.95), and land surface temperature of the three materials could be predicted by model testing. [Conclusion] For urban areas where soil quality is poor and vegetation is difficult to establish, such as places with bare sandy loams, organic mulch can mitigate the thermal effect of the local environment in summer. It is suggested to choose yellow and other light color mulch materials.
Key words:  cover  thermal effect  land surface  bare sandy loam  organic mulch materials