Ashenden T W, Rafarel C R, Bell S A
Institute of Terrestrial Ecology, Bangor Research Unit, University College of North Wales, Deiniol Road, Bangor, Gwynedd LL57 2UP, UK.
Environ Pollut. 1991;74(3):217-25. doi: 10.1016/0269-7491(91)90071-4.
A system is described for exposing large numbers of plants to acidic fogs. The system allows low volumes of treatment solutions to be provided at particle sizes chiefly in the 5-30 microm range (equivalent to fog/cloud droplets). Plants of Poa alpina L. and Epilobium brunnescens were propagated from material collected in Snowdonia, North Wales and exposed to fog treatments at pH values of 2.5, 3.5, 4.5 and 5.6. There were 3 x 4 h exposures per week which provided a total of 6 mm deposition. Supplementary watering was with pH 4.5 simulated acid rain (24 mm per week). After 21 weeks, there was increased lowering and a greater dry weight for plants of E. brunnescens exposed to the pH 2.5 fog in comparison with other treatments. Also, the plants used assimilated material to form shoots rather than roots. A similar increase in dry weight accumulation in the pH 2.5 treatment was found in P. alpina after 63 weeks but this was not associated with changes in assimilate partitioning.
描述了一种用于使大量植物暴露于酸性雾中的系统。该系统能够以主要在5 - 30微米范围内的粒径（相当于雾/云滴）提供少量处理溶液。高山早熟禾和褐毛柳叶菜的植株由从北威尔士斯诺多尼亚采集的材料繁殖而来，并在pH值为2.5、3.5、4.5和5.6的条件下进行雾处理。每周有3次4小时的暴露，总共沉积6毫米。补充浇水使用pH值为4.5的模拟酸雨（每周24毫米）。21周后，与其他处理相比，暴露于pH值为2.5的雾中的褐毛柳叶菜植株出现叶片下垂增加且干重更大的情况。此外，所用植株将同化物质用于形成地上部分而非根系。63周后，在高山早熟禾中发现pH值为2.5的处理中干重积累也有类似增加，但这与同化物分配的变化无关。
