Chemical composition of precipitation in a forest area of Chongqing,Southwest China |
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Authors: | Fuzhu Zhang Jingyang Zhang Hongrui Zhang Norio Ogura Akikuni Ushikubo |
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Affiliation: | 1. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 100080, Beijing, China 2. Tokyo University of Agriculture and Technology, Faculty of Agriculture, 183, Fuchu, Tokyo, Japan 3. Tokyo University of Agriculture, 156, Setagaya-Ku, Tokyo, Japan
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Abstract: | Experiments were carried.out in Chongging-a city seriously damaged by acid precipitation in southwest China — to explore chemical compositions of open bulk precipitation, throughfall and stemflow in a Masson pine (Pinus massoniana) forest. The results showed that annual mean pH values of and annual ion depositions in the three types of rain water were 4.47 and 50.6 g m?2, 3.82 and 69.7 g m?2, and 2.92 and 0.215 g m?2 respectively. pH values demonstrated an obvious seasonal variation; they were lower in winter than in the rest of the year. Ca2+ and NH inf4 sup+ together made up more than 80% of the total cation, while SO in4 sup2? alone contributed over 90% to the total anion. This high level of SO in4 sup2? in rain water in Chongqing, which outran those found in other cities in China, was closely related to the combustion of locally produced coal that contains 3 to 5% sulphur. Thus, acid precipitation in Chongqing is of a typical sulphuric-acid type. |
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