Trends of Major Inorganic Species at the Small Watershed Ecosystem in Northern Tama Hills, the Western Tokyo Metropolitan Area, Japan |
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| Authors: | Yukiho Ikeda Takeshi Hamada |
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| Institution: | 1. Kyorin University School of Health Sciences, 476 Miyashita, Hachioji, 192-8508, Japan
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| Abstract: | Acid rain impacts on the small forested watershed in northern Tama Hills in the western Tokyo metropolitan area Japan were investigated by surveying the trends of major inorganic species in rain and spring water during the years from 1991 to 1997. The ecosystem had been stressed by the annual H+-deposition of around 0.43 kmol/ha. The spring water outflow corresponded to ca. 27% of the precipitation. Budgets for the precipitation input and spring water output gave good balance for Cl?,?0.01 ±0.09 kmol/ha, net gains for H+, NO3 ? and SO4 2?, and to the contrary, relatively large net losses for Na+, Mg2+, Ca2+, Si(as H4SiO4) and HCO3 ?, thus suggesting the dissolution of chemical weathered products of silicate minerals. Further, in spring water, some concentration relationships were found: CNa+ = 376.5?2.05CCl? (R2=0.748), CNa+=12.69+0.5556CHCO3 ? (R2=0.872) and CH4SiO4=130.0 + 1.108CHCO3 ? (R2=0.816). Evidently, the spring water chemistry reflected probable geochemical changes in the soil layer of the watershed. Mass balance in the ecosystem and estimation of the spring water output of chemical weathered products were investigated |
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