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选择不同区域典型园林区,于秋季应用气溶胶再发生器(QRJZFSQ-I)测定北京市常绿化树种叶片单位面积滞纳不同粒径颗粒物能力,并推算单位面积林地滞纳颗粒物的物质量。结果表明:针叶树种对各粒径颗粒物(PM_(10)、PM_(2.5)和PM_(1.0))的滞纳能力均高于阔叶树;针叶树种间对不同粒径颗粒物滞纳量没有显著差异,不同阔叶树在南海子公园(城区)差异显著,其中,对PM_(10)滞纳力强的树种为杨树(1.256 kg·hm~(-2)·a~(-1))和柳树(1.153 kg·hm~(-2)·a~(-1)),对PM_(2.5)和PM_(1.0)滞纳力强的树种为白蜡(0.367和0.107 kg·hm~(-2)·a~(-1));相同树种在不同地点对总悬浮颗粒物(TSP)和PM_(10)的滞纳规律相同,对PM_(2.5)和PM_(1.0)的滞纳规律与前两种类型颗粒物略有不同,桧柏对这两种颗粒物的最大值出现在南海子公园(11.043 kg·hm~(-2)·a~(-1)),是最小值北京植物园的15倍;树种滞纳的各种颗粒物以PM_(10)比例较大,且其比例变化按“城区-近郊-远郊”呈渐降的趋势。
The typical garden areas of different regions were selected. The aerosol re-generator (QRJZFSQ-I) was used to measure the abilities of different size particles per unit leaf area of Beijing evergreen tree species in autumn and the mass of suspended sediment per unit area was estimated. The results showed that the lag capacity of coniferous species for PM10, PM2.5 and PM1.0 was higher than that for broadleaf tree. There was no significant difference in coniferous species between different coniferous species, Different broad-leaved trees had significant difference in Nanhaizi Park (urban area), among which, the delaying ability of PM_ (10) was poplar (1.256 kg · hm -2 · a -1) and willow (1.153 kg · Hm -2 · a -1). The species with poor abilities of PM 2.5 and PM 1.0 were white wax (0.367 and 0.107 kg · hm -2 · a -1) -1)). The same species in different locations had the same pattern of abatement of total suspended particulates (TSP) and PM 10 (10), and the abatement law of PM 2.5 and PM 1.0 was slightly different from that of the former two types of particulates The maximum of these two kinds of particles appeared in Nanhaizi Park (11.043 kg · hm -2 · a -1), which is 15 times of the minimum value of Beijing Botanical Garden; PM 10 (PM 10) is a large proportion of particles, and its proportion changes according to the trend of “city-suburban-suburban”.