佛山市几种绿地植物氟化物时空累积特征

对佛山市的防护绿地、公园绿地、生产绿地及附属绿地等城市绿地系统中的大叶榕、细叶榕、芒果、白兰、垂叶榕和尖叶杜英的叶片和各绿地系统中的大气氟化物含量进行了测定,并对其相互关系进行了研究。结果表明:四季中各绿地系统的大气氟化物含量均值的大小依次为防护绿地的工业区、交通区、附属绿地、生产绿地和公园绿地;工业区的大气氟化物浓度约为公园绿地的3.4倍,不同城市绿地系统的1、2年生植物叶片含氟量均随时间的延长而逐渐增加;大气氟化物与叶片含氟量之间存在密切相关性,反映了植物氟化物的空间累积特征,其中细叶榕和垂叶榕的1年生和2年生叶片、芒果的1年生叶片、白兰的2年生叶片中的氟化物浓度能较好地表征城市绿地系统中大气氟化物的浓度。

Spatiotemporal characteristics of fluoride accumulation in several greenbelt plants in Foshan City of Guangdong Province

The fluoride concentration in the leaves of Ficus virens var. sublanceolata, Ficus microcarpa, Ficus benjamina, Mangifera indica, Michelia alba and Elaeocarpus apiculatus grown in the Fushan urban greenbelt systems and that in the air above the greenbelt systems were measured, with their correlations analyzed. The results showed that the fluoride concentration in the air above test greenbelt systems ranked in the order of industrial greenbelt> traffic greenbelt>attached greenbelt in college campus>production greenbelt>park greenbelt. The air fluoride concentration above industrial greenbelt was 3.4 times as high as that above park greenbelt, and in all test greenbelt systems, the leaves of or two-year-old plants had an increasing fluoride concentration with time. There was a high correlation between the fluoride concentrations in air and plant leaves, which reflected the spatial characteristics of fluoride accumulation in greenbelt plants. The fluoride concentrations in the leaves of one- and two-year-old F. microcarpa and F. benjamina, one-year-old M. indica, and two-year-old M. alba could better indicate the air fluoride concentration in the urban greenbelt systems of Fushan City.