Nitrate pollution of groundwater in the Yellow River delta,China |
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| Authors: | Jianyao Chen Makoto Taniguchi Guanqun Liu Kunihide Miyaoka Shin-ichi Onodera Tomochika Tokunaga Yoshihiro Fukushima |
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| Institution: | (1) School of Geography Sciences and Planning, Zhongshan (Sun Yat-sen) University, Xingang Xi Road 135, Guangzhou, 510275, China;(2) Research Institute for Humanity and Nature, 457-4 Motoyama Kamigamo, Kyoto Kita-ku, 603-8047, Japan;(3) College of Environmental Science and Engineering, Ocean University of China, 5 Yushan Road, Qingdao, 266003, China;(4) Faculty of Education, Mie University, 1577 Kurimamachiya-cho, Tsu City, Mie Prefecture, Japan;(5) Faculty of Integrated Arts and Sciences, Hiroshima University, 1-7-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, Japan;(6) Department of Geosystem Engineering, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba, Japan |
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| Abstract: | Nitrate pollution of groundwater in the Yellow River delta, China is an important issue related not only to nitrate dispersion and health concerns but also to mass transport and interactions of groundwater, sea, and river waters in the coastal area. The spatial distribution of nitrate, nitrate sources, and nitrogen transformation processes were investigated by field surveys and geochemical methods. Nitrate occurred mainly in shallow layers and had a spatial distribution coinciding with geomorphology and land/water use. Irrigation water from the Yellow River and anthropogenic waste are two main nitrogen sources of nitrate in the delta, and both denitrification and mixing processes could take place according to characteristics identified by ionic and isotopic data. |
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| Keywords: | Groundwater flow Land and water use Nitrate pollution Stable isotopes Yellow River |
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