Abstract
Purpose
Yet the transformation and contribution of amorphous aluminum and iron which are usually indicated as oxalate-extractable forms (Alox and Feox) to phosphorus (P) sorption in paddy soils, under long-term organic amendments combined with alternating flooding and draining, were not fully understood. The aim of this study was to investigate the effects of organic amendments on P status and P sorption-associated attributes including Alox and Feox in a paddy soil.
Materials and methods
We selected 26 study sites that varied in three fertilization regimes (i.e., MF, straw, and manure) and three management histories (i.e., 2, 8, and 13 years) in the experiment station. Soil samples were assayed for (1) P accumulation status including total P, Olsen-P, oxalate-extractable (Pox) and degree of soil saturation with P (DPS), and (2) soil properties associated with P sorption including pH, soil organic matter (SOM), Alox, and Feox.
Results and discussion
Manure application presented significantly greater values for DPS (16.3 %, P < 0.01), Olsen-P / TP ratio (4 %, P < 0.01), and Olsen-P / Pox ratio (6.8 %, P < 0.01). Moreover, it increased the contents of Alox and Feox in the paddy soil, especially the content of Alox. Phosphorus accumulation in the paddy soil was not significant in straw treatment vs. MF treatment. Both Alox (P < 0.01) and Feox (P < 0.05) exhibited significantly linear relationships with SOM, suggesting that the organo-Al(Fe) complexes might widely generate in the paddy soil, which have strong affinity to P. In comparison with Feox, Alox showed greater correlation coefficients with soil P forms (varying from 0.56 to 0.81) and higher predictability for DPS of the paddy soil (R 2 = 0.3679, P < 0.01).
Conclusions
These results suggest that Alox is the primary soil property associated with P sorption in the paddy soil under long-term organic amendments and repeated redox circulations.
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Acknowledgments
This study was funded by the Agricultural Science and Technology Innovation Foundation of Jiangsu Province (CX(12)1002) and the National Natural Science Foundation of China (41401234).
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Responsible editor: Leo Condron
Xiao Yan and Zongqiang Wei contributed equally to this work.
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Yan, X., Wei, Z., Wang, D. et al. Phosphorus status and its sorption-associated soil properties in a paddy soil as affected by organic amendments. J Soils Sediments 15, 1882–1888 (2015). https://doi.org/10.1007/s11368-015-1132-4
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DOI: https://doi.org/10.1007/s11368-015-1132-4