| Effect of different external materials on the leaching and movement characteristics of soil phosphorus |
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| DOI：10.7606/j.issn.1000-7601.2017.05.22 |
| Key Words: external materials phosphorus leaching movement |
| Author Name | Affiliation | | ZHANG Yi | College of Natural Resources and Environment, Northwest A&F University, Key Laboratory of plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, China | | LI Hou-hua | Hanzhong Institute of Agriculture Science, Hanzhong, Shaanxi 723000, China | | HE Xu-sheng | College of Natural Resources and Environment, Northwest A&F University, Key Laboratory of plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, China | | LV Jia-long | College of Natural Resources and Environment, Northwest A&F University, Key Laboratory of plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, China |
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| Abstract: |
| A series of soil column experiments were conducted to study the effect of different external materials (soil conditioner、sandstone、biochar、straw) on the leaching and movement characteristics of soil phosphorus. The results showed that: (1) The concentration of total phosphorus (TP) in the leachate increased dramatically from 0.05 to 2.86 mg·L-1 under different treatment sand biochar and straw had significant effects on the leaching amounts of TP; (2) In biochar-enriched soil column, the total dissolved phospherus(TDP) concentration increased and then decreased with the increasing of leaching times, and the trend of TDP are similar to that of TP. The addition of straw reduced the percentage of dissolved reactive phosphorus (DRP) in TDP; (3) Straw caused a reduction of the available phosphorus(Olsen-P) concentration. Furthermore, Olsen-P concentration was increased by 141%、290%、382% as the amount of adding biochar was increased compared with that of CK; (4) Except for straw, the trend of soluble P (CaCl2-P) in different soil layers of all treatments was similar, as the concentration of CaCl2-P was decreased and then increased. The concentration of CaCl2-P had no differencies in different layers under straw condition, but that had significant differences in the biochar enriched soil layers. The results indicate that biochar significantly increased the leaching and movement ability of phosphorous. Straw reduced the concentration of DRP in the leachate, and it can reduce the downward movement of CaCl2-P. |
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