Journal
INTERNATIONAL JOURNAL OF ENVIRONMENT AND POLLUTION
Volume 40, Issue 4, Pages 351-362Publisher
INDERSCIENCE ENTERPRISES LTD
DOI: 10.1504/IJEP.2010.031755
Keywords
calcareous purple soil; soil phosphorus; change point; release risk
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Funding
- Natural Science Foundation of China [40571093]
- Western Development Plan of CAS [KZCX2-XB2-07-02]
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Growing concerns about water eutrophication male it imperative to control phosphorus (P) losses from agricultural soil to water. A Quantity-Intensity (Q-I) relationship that reflects the potential of soil P release to water was developed on the calcareous purple soil in southwestern China. Results showed that a change point appeared at 30 mg kg(-1) for Olsen-P and 22 mg kg(-1) for iron-oxide impregnated strips extracted P (FeO-P), respectively, on the curve of CaCl2-P against soil test P (STP). Above the change point, the P release was much more rapid with the increase of STP. Therefore, a threshold in STP was derived to support P source management practices on the soil.
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