Department of Plant Pathology, Agricultural Research Service, U.S. Department of Agriculture, University of Wisconsin, Madison, Wisconsin 53706.
Appl Environ Microbiol. 1985 Nov;50(5):1229-32. doi: 10.1128/aem.50.5.1229-1232.1985.
Plant canopies are strong sources of bacterial aerosols during sunny days when the leaves are dry. Bacterial concentration, upward flux, and deposition onto exposed petri plates were measured over snap beans during three growing seasons. A net upward flux of bacteria occurred only during the warm part of sunny days, not at night when leaves were wet with dew or when a thermal inversion was present. Aerosol source strength was positively correlated with wind speed. Upward fluxes were higher on days after rain than on days when the soil was dry. Other unidentified sources of variability in source strength probably exist. Canopy-level deposition, apparently due to intermediate-scale transport of bacteria in fairly concentrated clouds, can occur in the early evening.
在晴天干燥的叶子条件下，植物冠层是细菌气溶胶的强大来源。在三个生长季节中，对豌豆进行了细菌浓度、向上通量和暴露培养皿沉积的测量。仅在晴天的温暖时段才会出现细菌的净向上通量，而在夜间叶子被露水浸湿或存在热逆温时则不会。气溶胶源强度与风速呈正相关。雨后的日子比土壤干燥的日子向上通量更高。其他未知的源强度变化的来源可能存在。由于相当浓缩的云团中细菌的中尺度输运，冠层沉积可能会在傍晚发生。
