yle="MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; mso-outline-level: 2" class=MsoNormal>yle="COLOR: black; FONT-SIZE: 14pt; mso-font-kerning: 18.0pt; mso-bidi-font-weight: bold" lang=EN-US>w Roman">Distribution and Genesis of "The Three Nitrogen" in w:st="on">w:st="on">Zhangye ype w:st="on">Cityype>

• 责任者：Zhang Long (No.2 Geology and Mineral Exploration Team ; Gansu Provincial Bureau of Geology and Mineral Exploration and Development ; Lanzhou 730000 ; China) ; Cui Zhenqing
• 刊名：Gansu Geology
• 出版年：2010
• 卷期：19(1)
• 关键词：水污染 ; water pollution ; 氮 ; nitrogen ; 甘肃 ; Gansu Province
• 页码：p.61-63
• 图表：1 ref.
• 分类号：1800
• issnNo：ISSN1004-4116
• isbnNo：CN 62-1191/P

yle="MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" class=MsoNormal>yle="FONT-SIZE: 14pt; mso-font-kerning: 0pt" lang=EN-US>w Roman">The technology of N isotope has been employed to recognize the source of NO₃^- ion in w:st="on">w:st="on">Zhangye ype w:st="on">Cityype>. The result show that the irrigation with the polluted water is the main source of NO₃^- in the shallow groundwater, yle="mso-spacerun: yes"> in non-polluted irrigation area , large-scale use of chemical fertilizers and the manure heap is the main source of NO₃^- in the around groundwater.