|Title:||由氮同位素評估南投地區河水中NO3-之來源及轉化||Other Titles:||Evaluation of the Origin and Transformation of Nitrate in River Water of Nantou Area Using the Nitrogen Isotopes in NO3-||Authors:||彭宗仁
|Keywords:||硝酸鹽;氮同位素;河水;南投地區;Nitrate;Nitrogen isotope;River water;Nantou area||Issue Date:||Dec-2004||Publisher:||中華土壤肥料學會||Journal Volume:||7||Journal Issue:||3-4||Start page/Pages:||167-182||Source:||土壤與環境||Abstract:||
River water is an important source of fresh water resource in Taiwan but its utilization is much constrained by contamination from human activity. Nitrate is a significant index for indicating the sources of anthropogenic contamination in waters. In order to evaluate the potential source and transformation of NO3' in rivers of Nantou area, the newly developed method of anion exchange resin is used to collect the NO3' from water and detect the nitrogen isotopic composition of NO3'. Comparing the content of 15N of NO3' with pH and NO3' concentration in waters of both dry and rainy seasons, it indicated the primary input and output of NO3' in river are mineralization and assimilation. The degree of mineralization in rainy season is higher than that of dry season and evidenced by higher NO3- concentration and lighter δ15N in rainy season's water. Assimilation is more conspicuous in dry season, especially in water from the first stream order of upstream watershed area, as less NO3- detected in river imported from mineralization. The concentration and δ15N of NO3- in waters also implicate that anthropogenic NO3- of this area is not significant and most. NO3- in rivers is derived from soil organic nitrogen except that in downstream outlet of Puli Basin, which is slightly affected by animal excreta.
|Appears in Collections:||農業化學組|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.