| Summary: | 碩士 === 臺灣大學 === 海洋研究所 === 98 === Rivers and estuaries are the major source of suspended particles and dissolved loads exported into the ocean. These materials have considerable effect on marine chemistry of offshore areas. To understand the differences of dissolved loads between Danshuei and Lanyang rivers, both tributaries are originated from the Central Range, the concentrations of major ions of the two rivers are analyzed and compared.
Of all the dissolved cations of Hsing-Dian stream, Na+ is the most abundant cation(53％), followed by Ca2++Mg2+(44％) and K+(3％). On the other hand, there is no distinct difference among the concentrations of anions, about 40％ of the anions is HCO3-, 31％ is Cl- and 29％ is SO42-. The concentrations of major ions in waters of Keelung River and Dai-Han stream are similar to those of Hsing-Dian stream. The results suggest that the bedrocks of the Danshuei River are mainly composed of aluminosilicate minerals. In Lanyang stream, Ca2++Mg2+ is the most abundant dissolved cation(74％), followed by Na+(23％) and K+(3％). On the other hand, dissolved HCO3- is the most abundant anion(64％)；SO42- is the second(32％) and Cl-(4％) is the least abundant anion. These differences are no doubtly due to the bedrocks of the Lanyang stream are abundant in carbonate minerals.
In conclusion, although both Danshuei river and Lanyang stream originated from the Central Range, due to the difference in bedrock geology, the major ions released into rivers or streams are different as well.
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