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| Effects of Two Organic Amendments on Phosphorus Transformation in Greenhouse Soil |
| Received:October 20, 2014 |
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| KeyWord:soil phosphorus;transformation;greenhouse vegetable soil;phosphorus fraction;organic amendments |
| Author Name | Affiliation | | HUANG Min | School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China | | YIN Wei-wen | School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China | | YU Wan-xia | School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China | | ZHOU Kai-lai | School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China | | HUANG Yong-bing | School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China | | SHI Xiao-juan | School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China |
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| Abstract: |
| Greenhouse soils are different from common agricultural soils in nutrient transformation, due to high temperature and moisture. In this study, the effects of rice straw and peat applications on the transformation of phosphorus(P) in a greenhouse vegetable soil were studied in a laboratory incubation. Dynamics of soil microbial biomass P(MBP), available P(Olsen-P) and readily desorption P(CaCl2-P) were examined during a 90-day experimental period. Inorganic P was fractionationed as aluminum(Al-P), ferric(Fe-P), calcium(Ca-P) and occluded P(O-P), while organic P as labile organic P(LOP), moderately labile organic P(MLOP), moderately resistant organic P(MROP) and highly resistant organic P(HROP). Compared to the control, soil MBP increased by 111.1%～310.0% and 197.7%～356.3% following rice straw amendments at 2 gC·kg-1 and 4 gC·kg-1, respectively, while it increased by 23.7%~54.6% and 63.2%～157.1% following peat additions at 2 gC·kg-1 and 4 gC·kg-1 peat, respectively. Soil Olsen-P decreased by average 15.0% and 20.2% after additions of rice straw at 2 g C·kg-1 and 4 g C·kg-1, respectively. However, peat additions did not significantly change soil Olsen-P until 45 days of incubation. Soil CaCl2-P kept declining after 30 days of incubation. After 90-day incubation, rice straw and peat reduced CaCl2-P by average 21.3% and 10.9%, respectively, in comparison with the control. By comparing the percentages of each P fractions over total P at the end of incubation, rice straw and peat both enhanced the conversion of Al-P, Fe-P, O-P, LOP and HROP to LOP and MROP. The correlation coefficients between MBP, Olsen-P, CaCl2-P and Fe-P fractions were statistically significant at P<0.05. In conclusion, rice straw and peat amendments would help control P transformations in greenhouse soils, with rice straw more effective than peat. Fe-P may be a vital chemical fraction in regulating cycling, transformation and runoff of phosphorus in greenhouse soils. |
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