Chemical Fractionation and Sorption of Phosphorus in Greek Inceptisols
Chemical Fractionation and Sorption of Phosphorus in Greek Inceptisols作者机构：Laboratory of Soils and Agricultural Chemistry Agricultural University of Athens Iera Odos 75 Athens 11855 Greece
出 版 物：《Journal of Agricultural Science and Technology(A)》 (农业科学与技术（A）)
年 卷 期：2011年第1卷第1X期
页 面：33-38页
学科分类：07[理学] 070601[理学-气象学] 09[农学] 0903[农学-农业资源与环境] 0706[理学-大气科学] 090301[农学-土壤学]
主 题：Phosphorus fractionation sorption langmuir equation inceptisols
摘 要：Phosphorus fractionation and sorption, both separately and jointly, were studied in two cultivated Inceptisols in Northern Greece. Hedley＇s extraction was used to separate soil phosphorus （P） into inorganic Pi （geochemical） and organic Po （biological） fractions. Direct extractable P by Olsen （Olsen-P）, by Mehlich llI （M3-P） and by ammonium oxalate （Pox） was also determined. Phosphorus sorption was carried out with 1：10 soil/solution ratio and sorption parameters were derived from the Langmuir model to the experimental data. Most of the total P occurred in inorganic P forms （74% of Pt）, while organic P comprised only 26% of the Pt. Among the various inorganic P forms relatively large amount of residual P （111 mg kg^-1） was observed, while occluded P in calcium phosphate minerals （***-Pi） and in Fe, Al-oxides （***-Pi） existed in equal amounts （83.1 and 83.7 mg kg^-1 respectively）. The phosphorus sorption parameters showed positive relationships with clay content, cation exchange capacity and the sum of exchangeable calcium plus magnesium. Overall, this study indicated that Ca and Mg compounds strongly influence the P chemistry in moderately weathered soils, with relatively high concentration of primary P minerals.
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