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本文着重研究树木的杀菌作用,以北京市为点,探索不同地区的空气含菌量与树木之间的关系,并就北京市一些常见绿化树种的杀菌作用及其所具有的杀菌能力的差别加以研究,为更大地发挥森林的环境保护效益提供科学依据。一、材料和方法 (一)用自然沉降法测定不同林地、不同地区空气中细菌含量:在北京市西从香山公园起,东至东郊机场路,选择不同地区类型、不同树种林地共18处,分别于1979年6月22日、8月23日重复采样二次。在每处采用对角线法选点五个,每个点用牛肉汁琼脂培养基(即N.B.A.培养基)平板二个,置于呼吸带水平高度(即距离地面1.2-1.5米)暴露五分钟,然后立即放入37℃恒
This paper focuses on the bactericidal effect of trees. Taking Beijing as a point, this paper explores the relationship between airborne bacteria content and trees in different regions and compares the bactericidal effect and the bactericidal abilities of some common greening species in Beijing. Research, in order to give more play to the effectiveness of forest environmental protection to provide a scientific basis. Materials and Methods (I) Natural sedimentation method for the determination of airborne bacteria content in different woodlands and in different areas: In the west of Beijing City, from Xiangshan Park to the east and to the east of the Airport Road, a total of 18 different types of forest land were selected , Respectively, in June 22, 1979, August 23, repeated sampling twice. Five points were selected by diagonal method in each place, and each point was exposed to two plates of beef juice agar (ie, NBA medium) for five minutes at the level of the respiratory band (ie, 1.2-1.5 meters above the ground) , Then immediately put 37 ℃ constant