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     当前位置: 发布论文 --  院重点实验室博士生王永壮在《Can.J.Soil Sci.》发表文章
院重点实验室博士生王永壮在《Can.J.Soil Sci.》发表文章
发布时间:2016/11/8

院重点实验室博士生王永壮在Can.J.Soil Sci.正式发表Mechanisms for altering phosphorus sorption characteristics induced by low-molecular-weight organic acids一文。本研究受国家自然科学基金(41271317, 31470624)项目的资助。

文章索引/Citation                                                                                         

Yongzhuang Wang, Joann K. Whalen, Xin Chen, Yanhong Cao, Bin Huang, Caiyan Lu, and Yi Shi. Mechanisms for altering phosphorus sorption characteristics induced by low-molecular-weight organic acids. Can.J.Soil Sci.96: 289298 (2016) 

文章摘要/Abstract

Exudation of low-molecular-weight organic acids (LMWOAs) from plant roots enhances phosphorus (P) acquisition from soil, either by dissolving P fixed in secondary minerals or by reducing P sorption to organominerals. How LMWOAs may modify P sorption in soils with contrasting pH is not well understood, much less the mechanisms involved. The effects of three common LMWOAs (oxalic, citric, and malic acids) on P sorption in calcareous, neutral, and acidic soils were studied in batch experiments, followed by sequential P fractionation to elucidate the mechanisms whereby LMWOAs alter P sorption. The sorption data of the three soils fitted better
to the Freundlich equation (r2 = 0.325–0.994, P < 0.05) than the Langmuir and linear equations. Oxalic, citric, and malic acids at 10 mmol kg−1 soil decreased the Freundlich P sorption parameters Kf and n, which represent P sorption capacity and energy, due to the fact that LMWOAs reduced P sorption in NaHCO3-Pi (soil soluble and exchangeable Pi, 23.8–30.9%) and NaOH-Pi (Fe-Pi and Al-Pi, 21.6–54.2%) fractions of the three soils. Comparing acidified P-LMWOAs solutions with the pH-adjusted P-LMWOAs solutions (pH = 7) had a minor effect on P sorption. Our results indicated that the reduction in soil P sorption was due to ligand exchange and chelation of LMWOAs with Fe and Al minerals, and the acid strength of LMWOAs had a minor effect on P sorption in calcare ous, neutral, and acid soils.


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