Study On The Effect Of Plants To The Concentration Of Negative Air Ions

Recently, people are more and more attation to environmental problems, air quality is very important to people's physical and mental health, and it is becomes the focus of the whole world. In environmental assessment, the concentration of negative air ions is becomes the important index in air quality assessment. The article mainly disscuss a few promotion of plants on negative air ions(NAI). Generally, there are two parts in the experiments, the one we use weak current low frequency and high voltage generator which is development by us to stimulate the soil near the potted plants, and the plants generate more negative air ions in this way, and the orther one we monitoring the concentration of negative air ions in different forest region.The results of the indoor experiments are:(1) The change rule of negative air ions concentration is different in the four planst, the emergence time of the maximum and minimum negative air ions concentration is different.(2) Weather affect the change of negative air ions concentration, the highest negative air ions concentration of Ficus elastica, Chamaecyparis pisifera and Schefflera octophylla is in rainy day, while the lowest is in clear day, but Begonia argenteo-guttata is different, it's highest negative air ions concentration is in rainyday, while the lowest is in cloudy day.(3) Sustaining stimulation 13 hours with high voltage,we find Ficus elastica and Chamaecyparis pisifera does not"tired", that is their capacity to generate NAI is not reduce, but Begonia argenteo-guttata is"tired".(4) The capacity of generate NAI by plants exist"age dependen", the negative air ions concectration in the two age Begonia argenteo-guttata and Chamaecyparis pisifera are higher than the four age.(5) The capacity of generate NAI by different plants is difference when light or not, Ficus elastica in the light and no light conditions, negative air ions concentration was not significantly different, but the netative air ions concentration of Chamaecyparis pisifera is in a very significant difference.(6) Begonia argenteo-guttata, Ficus elastica and Chamaecyparis pisifera can continuous stably genetate a certain amount of NAI in a short time.The results of field monitaoring are: (1) The negative air ions concentration and air quality of ten age Robinia pseudoacacia are higher than the twenty-five age.(2) The negative air ions in coniferous forest was significant higher than that in the broadleaf forest .(3) The negative air ions concentration and air quality of the different vegetation structure are as follows:multilayer structure> double arbor and lawn strcuture>double shrub and lawn structure> grassland >bald land.