Chemical Composition of Precipitation in Beijing Area, Northern China
作者： Yizong Huang , Yanwen Feng , Norio Ogura , Fuzhu Zhang , Zongwei Feng
关键词: Precipitation 、 Throughfall 、 Negative correlation 、 Chemical composition 、 Coal combustion products 、 Stemflow 、 Ion 、 Chemistry 、 Analytical chemistry 、 Hydrology 、 Tree species
摘要: Variations of anions (SO42-, NO3-,NO2-, Cl- and F-),cations (K+,Na+, Ca2+, Mg2+ \({NH}_4^+\)+) pH values in precipitation, througfall stemflow samples collected overa four-year period (1995–1998) Beijing (two sitesZhongguancun Mangshan) are presented. The annualvolume-weighted range were 6.57–7.11 inprecipitation, 5.46–6.86 thoughfall 5.32–6.41 instemflow. fominant anion was \({SO}_4^{2-}\), while Ca+and NH4+ the main cations precipitation,throughfall stemflow. Most ion concentrations with throughfall volume showed negative correlation, except for some ones. Significant correlationvalues also found between ions (SO42-,NO3-, Cl-, F-, Ca2+,Mg2+ andNa+) indicatedthe common sources these such as coal combustion,automobile emission fertilizers application. Compared toprecipitation, there an increased concentration inthroughfall or Changes werein Quercus liatungensis Koiz. Pinus tabulaefornisCarr. (or stemflow) because different crown andbark qualities tree species.
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