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| Impacts of acid mine drainage on form andavailability of phosphorus in paddy soil |
| Received:September 02, 2014 |
| DOI： |
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| Abstract: |
| The paddy soil in typical karst region of Southwest China were selected to simulate variation of different
mineral forms of phosphorus including iron phosphate (Fe-P), calcium phosphate (Ca-P), occluded phosphorus (O-P),
aluminum phosphate phosphorus (Al-P), total phosphorus and available phosphorus by sewage irrigation experiment of
acid mine drainage pollution (AMD). It was also designed to investigate the impact of pH and iron ions in AMD on
releasing of phosphorus from the paddy soil and to estimate the effects of AMD continuous pollution on forms of
phosphorus and available phosphorus in paddy soil. The results showed that Fe-P in paddy soil significantly increased (P=
0.0001) at low addition of AMD when the ratio of AMD was lower than 50% and then kept stable at 50%-75%. As well,
Fe -P was the main form of total inorganic phosphorus in paddy soil. The contents of Ca -P, O -P, Al -P increased
significantly at extremely low ratio of 0.1%-1% and then decreased at high ratio above 1% (PCa-P=0.0003, PO-P=0.0001, PAl-
P=0.0001). Available phosphorus had the same trend with Ca-P, O-P, Al-P, which indicated that high AMD content could
cause significant leaching of phosphorus. The organic phosphorus content in soil had slight rise at level of 0%-10%, and
then kept stable at 10%-75%, and finally showed a negative relationship (P=0.030) with AMD concentration when the ratio
exceeded 75%. The content of total phosphorus increased slightly at the beginning and then continually declined with the
increase of pollution, but the overall change was not obvious. The reduce of pH had no obvious impact on
dissolution of phosphorus (Ca-P), but the impact could be significant by addition of iron. It concludes that the acid
mine drainage pollution can significantly impact the forms and effectiveness of phosphorus in paddy soil, especially
in the high iron content of AMD pollution. |
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