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植物气孔扩散阻力与环境中颗粒物的污染有密切关系,由此得出的生理指标可用以指示大气中飘尘污染的程度,并筛选对污染物抗性大和消耗水分少的植物种。测定结果表明:不同污染类型区的植物气孔扩散阻力的大小顺序因地区而不同,在天津为冶炼厂(重工业污染区)>水上公园(游览区)>劝业场(商业集中区)>化工厂外(化工污染区)>盘山(清洁区);而在北京是卧佛寺—樱桃沟(游览区)>东单(交通频繁区)>首钢(重工业污染区)。之所以产生上述差异的原因除了京津两市的工业污染外,还与某些人为活动有关,如重工业污染区飘尘污染严重,植物气孔扩散阻力增大,但首钢经常用水冲洗叶子,其阻力值反小;公园和商业交通区是游人熙攘地点,极易引起地面扬尘,其气孔阻力反映了相似的结果。研究结果还阐明:随着飘尘的增加,植物气孔扩散阻力增大,蒸腾率速相应的变小。
Plant stomatal diffusion resistance and environmental pollution are closely related to particulate matter, the resulting physiological indicators can be used to indicate the degree of fly ash pollution in the atmosphere, and screening for the resistance to pollutants and consume less water plant species. The results showed that the orders of stomatal diffusion resistance in different types of polluted area were different according to different regions. In Tianjin, the order of smelting plant (heavy industry polluted area)> water park (excursion area)> Quanyechang (commercial concentration area)> chemical plant (Chemical polluted area)> Panshan (clean area); and in Beijing are the Temple of the Reclining Buddha - Cherry Valley (tourist area)> Dongdan (frequent traffic area)> Shougang (heavy industry polluted area). The reasons for the above differences are not only industrial pollution in Beijing and Tianjin, but also activities related to certain people. For example, heavy industry dust pollution is serious, and stomatal diffusion resistance is increased. However, Shougang often rinse leaves with water and its resistance value Anti-small; parks and commercial traffic area is a bustling place for tourists, can easily cause dust on the ground, the stomatal resistance reflects similar results. The results also show that with the increase of fly ash, the stomatal diffusion resistance increases and the transpiration rate decreases accordingly.