Chemical Composition of Precipitation in Beijing Area, Northern China |
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Authors: | Zongwei Feng Yizong Huang Yanwen Feng Norio Ogura Fuzhu Zhang |
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Institution: | (1) Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, P.R. China;(2) Agriculture and Technology, Tokyo University, Tokyo, Japan |
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Abstract: | Variations of anions (SO4
2-, NO3
-,NO2
-, Cl- and F-),cations (K+,Na+, Ca2+, Mg2+ and
+) and pH values in precipitation, througfall and stemflow samples collected overa four-year period (1995–1998) in Beijing (two sitesZhongguancun and Mangshan) are presented. The annualvolume-weighted range of pH values were 6.57–7.11 inprecipitation, 5.46–6.86 in thoughfall and 5.32–6.41 instemflow. The fominant anion was
, while Ca+and NH4
+ were the main cations in precipitation,throughfall and stemflow. Most of ion concentrations with precipitation, throughfall and stemflow volume showed negative correlation, except for some ones. Significant correlationvalues were also found between ions (SO4
2-,NO3
-, Cl-, F-, Ca2+,Mg2+ andNa+) in precipitation, throughfall and stemflow indicatedthe common sources of these ions such as coal combustion,automobile emission and fertilizers application. Compared toprecipitation, there was an increased ion concentration inthroughfall or in stemflow. Changes of ion concentrations werein Quercus liatungensis Koiz. and Pinus tabulaefornisCarr. throughfall (or stemflow) because of different crown andbark qualities of tree species. |
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Keywords: | chemical composition precipitation small forestedcatchment |
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