Radzi Abas M, Ahmad-Shah A, Nor Awang M
Department of Chemistry, University of Malaya, 59100 Kuala Lumpur, Malaysia.
Environ Pollut. 1992;75(2):209-13. doi: 10.1016/0269-7491(92)90041-8.
A study was carried out to determine the chemical composition of bulk precipitation, throughfall and stemflow in an urban forest in Kuala Lumpur, Malaysia. The mean weekly rainfall recorded during the period of study was 63.2 mm. Throughfall, stemflow and canopy interception of incident precipitation were 77.1%, 1.2% and 21.7% respectively. Bulk precipitation, througfall and stemflow were acidic, the pH recorded being 4.37, 4.71 and 4.15 respectively. In all cases the dominant ions were NO3, SO4, Cl, NH4, K, Ca and Na. Of the ions studied Ca, K, Cl, SO4, Mg and Mn showed net increases in passing through the forest canopy, while NH4, Na, NO3, Zn, H and Fe showed net retention. This study shows that the urban environment of Kuala Lumpur contributes considerable amounts of materials to the atmosphere, as reflected by the high ionic contents in bulk precipitation, throughfall and stemflow.
开展了一项研究，以确定马来西亚吉隆坡一个城市森林中大气降水、穿透雨和树干流的化学成分。研究期间记录的平均每周降雨量为63.2毫米。入射降水的穿透雨、树干流和树冠截留率分别为77.1%、1.2%和21.7%。大气降水、穿透雨和树干流均呈酸性，记录的pH值分别为4.37、4.71和4.15。在所有情况下，主要离子为硝酸根、硫酸根、氯离子、铵根、钾离子、钙离子和钠离子。在所研究的离子中，钙、钾、氯、硫酸根、镁和锰在穿过森林树冠层时呈净增加，而铵根、钠、硝酸根、锌、氢离子和铁呈净截留。这项研究表明，吉隆坡的城市环境向大气中排放了大量物质，这体现在大气降水、穿透雨和树干流中的高离子含量上。
