Chen Jianyao

Tang Changyuan

福嶌 義宏

Research Institute for Humanity and Nature Repository

Nitrate pollution in groundwater in the lower reach of the Yellow River,- case study in Shandong Province, China-J. Chen1,2 lResearch Institute for Humanity and Nature, Kyoto, 602-0878, Japan 2rnstitute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, China C. Tang Graduate School of Science and Technology, Chiba University, Japan Y. Fukushima Research Institute for Humanity and Nature, Kyoto, 602-0878, Japan Yucheng and Qihe counties in the lower reaches of the Yellow River tended to be an important agricultural area after the Yellow River water was diverted in 1972. Field surveys and sampling were implemented in the area to examine the nitrate pollution of groundwater, which is recharged dominantly by the diverted water. Nitrate pollution was found to have occurred in the shallow layer of less than 8 m in depth with the highest concentration of more than 200 mg/I. Though nitrate content was found in the Yellow River ranging from 16.3 to 37.1 mg N03/1, it was not found in the canal, ditch and pond used to convey and store the diverted water, excluding the N source from the Yellow River. 15N was measured to identify the nitrogen of anthropogenic and fertilizer/soil organic sources. The upward potential gradient of the saturated zone observed in the piezometers at Yucheng Experimental Station, the occurrence of ZFP at 120 cm depth, and denitrification process deduced from the change in &15N and S04 concentration helped explain why N03 was found only in the shallow layer of the aquifer. 62 . $  =  ~ ~ ~ . =  -c . .  =  . =  -Q .  ~ ~ 3 0 0 .  ~ 2 5 0 .  r  . 5  2 0 0 .  ~ 1  1 5 0 .  S  ' "  ~ ~ 1 0 0 .  5 0 .  T u g a i  R i v e r  0  5 0  0  1 0  2 0  •  •  ~ 3 0  4 0  5 0  6 0  N i t r a t e  i n  m g  N 03/ l  1 0 0  1 5 0  2 0 0  2 5 0  •  •  •  - .  e l l o w  R i v e  r  F u l l  s c r e e n  1 .  N i t r a t e  c o n c e n t r a t i o n :  0 - 2 0 0  m g t l  2 .  O n e  t h i r d  o f  w e l l s  w e r e  p o l l u t e d  3 .  D e p t h :  <  8  m  4 .  N i t r a t e  i n  t h e  Y e l l o w  R i v e r  ( m g t l ) :  1 6 . 8 - M a y  2 0 0 0 ,  1 4 . 7 - S e p t  2 0 0 0  3 7 . 1 - D e c  2 0 0 0 ,  1 6 . 3 - A p r i l 2 0 0 1  7 0  ' - - _ _ _ _ _ _ _ _ _  5 .  N o  n i t r a t e  d e t e c t e d  i n  t h e  d i v e r t e d  w a t e r  3 0 c m  0 0  ~ J  I~ ~uamn m a n u r E  f f  I I I  A n i m a l  m a n u r e  ; >  ~ 1--0 0  I  ~ I ' l l  - -- --9 0  --4  ve~tab~arden e t a  g  _  e n  0 0  !  •  ~, --0 0  d r i l l l d ! t g : : 1 U  I l J  I  •  ~~ ( I . - i n k i n g  w e l l  0 0  ~ 1 i  1  •  - ~getable ~ a r d e n  •  --- -( ) ( ) -P Q U l l l l  f a r m  alttl~ I t  a  I ~ f i e l d  0 . 0 0  5 . 0 0  1 0 . 0 0  1 5 . 0 0  2 0 . 0 0  2 5 . 0 0  3 0 . 0 0  D e l t a  n i t r o g e n  1 5  i n  p e r  m i l l  A I R  W h y  d o e s  n i t r a t e  o c c u r  o n l y  i n  t h e  s h a l l o w  s u r f a c e  l a y e r  o f  l e s s  t h a n  8  m  d e p t h :  u p w a r d  g r a d i e n t  p o t e n t i a l  i n  t h e  u n s a t u r a t e d  z o n e ;  f r e q u e n t  o c c u r r e n c e  o f  Z F P  a t  1 2 0  c m  d e p t h  i n  t h e  u n s a t u r a t e d  z o n e ;  d e n i t r i f i c a t i o n  p r o c e s s e s .  6 3  

Nitrate pollution in groundwater in the lower reach of the Yellow River, - case study in Shandong Province, China-

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Nitrate pollution in groundwater in the lower reach of the Yellow River, - case study in Shandong Province, China-

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