The Chacteristic Of Acid Rain In Liuzhou And Its Impact On The Growth Of Masson Pine Stands

Acid rain has affected on our Ecosystem with the industry development. For consumption of high sulphur coal, Liuzhou has been one among three of acid rain area of China. According to the research about the effect on forest by acid rain cooperated between Chinese Academy of Forestry and South Korea Academy of Forestry, a polluted plot in Changtang and a clear plot in Sanmenjinag were set to study about the impact on the growth of Masson Pine by acid rain in Liuzhou city, which is a industrial and traffic center of Southwest of China. The result indicated that (1) the major anion of acid rain in Liuzhou were SO42 and NO3, the major cations were Ca2+, NH4+ ,proving it sulfate type acid rain. (2)The frequency of acid rain in 2003 had dropped down to 61.99% compare to 82.34% in 2002 in Liuzhou.But the NO3 concentration had increased 83.4% in 2003 in Changtang and that of Sanmenjiang had declined lightly. The average pH was 5.10 in 2002 and 5.32 in 2003 in Liuzhou.(3)The study also showed that the Masson Pines were affected on its height growth, tree volume by the acid rain. (4)The average pH of 0-60cm soil in Changtang was 4.02 and that of Sanmenjiang was 4.80.The soils were acidified by acid rain and nutritions of the soils were leached resulting in infertiling and impacting the growth of Masson Pine. The background element content of total nitrgen, avaivable phosphorus, avaivable potassium and so on in No. 1 plot of polluted area were lower than the clear plots resulted from the soil acidification.(5)The activities of microbes were restrained by acid rain. The number of microorganism in No. 1 plot of Changtang was lower than those in Sanmenjiang plots. (6)Moreover measures to control acid rain by liming in polluted area to neutralize resulted in reducing averagely 0.13 pH of soil, and the element content in soil had been improved gradually. The number of microbes had been increased in the No.2, No.3 and No.4 plots in polluted area. The quantity of bacteria had sored to 8.0×109per kilogram soil and N2-fixing bacteria also get 2.5×107per kilogram soil in Spring.The appropriate quantity of liming were 20Kg to 30Kg per 100 m2 of soil. It is a practical and effective way to reduce the pollution of acid rain. (7) Some suggestions were put forward to integrated control the acid rain from the origin of coal use and control every process of fossil fuel comsuption.