Sulfur dioxide (SO2) is a major air pollutant, especially in developing countries. Many trees are seriously impaired by SO2, while other species can mitigate air pollution by absorbing this gas. Planting appropriate t...Sulfur dioxide (SO2) is a major air pollutant, especially in developing countries. Many trees are seriously impaired by SO2, while other species can mitigate air pollution by absorbing this gas. Planting appropriate tree species near industrial complexes is critical for aesthetic value and pollution mitigation. In this study, six landscape tree species typical of a subtropical area were investigated for their tolerance of SO2: Cinnamomum camphora (L.) J. Presl., Ilex rotunda Thunb., Lysidice rhodostegia Hance, Ceiba insignis (Kunth) P. E. Gibbs & Semir, Cassia surattensis Burm. f., and Michelia chapensis Dandy. We measured net photosynthesis rate, stomatal conductance, leaf sulfur content, relative water content, relative proline content, and other parameters under 1.31 mg·m-3 SO2 fumigation for eight days. The results revealed that the six species differed in their biochemical characteristics under SO2 stress. Based on these data, the most appropriate species for planting in SO2 polluted areas was I. rotunda, because it grew normally under SO2 stress and could absorb SO2.展开更多
The Fluorine release rate of coal, clay of different Fluorine content, and coalmixed with clay used by resident households were studied by using the ion selective electrode(ISE) and solidoid balance methods, and the d...The Fluorine release rate of coal, clay of different Fluorine content, and coalmixed with clay used by resident households were studied by using the ion selective electrode(ISE) and solidoid balance methods, and the degree of influence on Fluorine pollutiongenerated by coal and clay was analyzed according to the proportion characteristicsof coal used by resident households.The results show that the Fluorine release rate ofcoal is more than 95% during combustion; The Fluorine release rate of clay is more than99%; The Fluorine release rate of coal mixed with clay is between 56.44% and 96.64%,and the average value is 76.68%.The clay as a binder for fine coal is one importantsource of Fluorine pollution caused by coal-combustion in Zhaotong, Yunnan Province.When the Fluorine content of coal is less than 80 mg/kg, the Fluorine amount releasedfrom clay (in which Fluorine content is more than 530 mg/kg) is more than 50% of the totalFluorine amount released from coal and clay during coal-combustion.The Fluorineamount released from clay (in which Fluorine content is more than 1 000 mg/kg) is morethan 70% of total Fluorine amount released from coal and clay during coal-combustion.展开更多
文摘Sulfur dioxide (SO2) is a major air pollutant, especially in developing countries. Many trees are seriously impaired by SO2, while other species can mitigate air pollution by absorbing this gas. Planting appropriate tree species near industrial complexes is critical for aesthetic value and pollution mitigation. In this study, six landscape tree species typical of a subtropical area were investigated for their tolerance of SO2: Cinnamomum camphora (L.) J. Presl., Ilex rotunda Thunb., Lysidice rhodostegia Hance, Ceiba insignis (Kunth) P. E. Gibbs & Semir, Cassia surattensis Burm. f., and Michelia chapensis Dandy. We measured net photosynthesis rate, stomatal conductance, leaf sulfur content, relative water content, relative proline content, and other parameters under 1.31 mg·m-3 SO2 fumigation for eight days. The results revealed that the six species differed in their biochemical characteristics under SO2 stress. Based on these data, the most appropriate species for planting in SO2 polluted areas was I. rotunda, because it grew normally under SO2 stress and could absorb SO2.
基金Supported by the National High-Tech Research and Development Program of China(2006AA06Z380)the National Natural Science Fundation of China(40872210)Western Key Fund(90202017)
文摘The Fluorine release rate of coal, clay of different Fluorine content, and coalmixed with clay used by resident households were studied by using the ion selective electrode(ISE) and solidoid balance methods, and the degree of influence on Fluorine pollutiongenerated by coal and clay was analyzed according to the proportion characteristicsof coal used by resident households.The results show that the Fluorine release rate ofcoal is more than 95% during combustion; The Fluorine release rate of clay is more than99%; The Fluorine release rate of coal mixed with clay is between 56.44% and 96.64%,and the average value is 76.68%.The clay as a binder for fine coal is one importantsource of Fluorine pollution caused by coal-combustion in Zhaotong, Yunnan Province.When the Fluorine content of coal is less than 80 mg/kg, the Fluorine amount releasedfrom clay (in which Fluorine content is more than 530 mg/kg) is more than 50% of the totalFluorine amount released from coal and clay during coal-combustion.The Fluorineamount released from clay (in which Fluorine content is more than 1 000 mg/kg) is morethan 70% of total Fluorine amount released from coal and clay during coal-combustion.
