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机构地区:[1]宁夏大学农学院,银川750021 [2]宁夏大学新技术应用研究开发中心,银川750021
出 处:《西北农业学报》2013年第5期151-156,共6页Acta Agriculturae Boreali-occidentalis Sinica
基 金:宁夏科技兴农项目;国家科技支撑计划项目(2007BAC08B01)
摘 要:为探明脱硫石膏对碱化土壤磷素有效性影响的机制,采用田间试验方法,研究不同脱硫石膏施用量对碱化土壤全磷、有效磷、无机磷组分等的影响。结果显示,与对照相比,施入脱硫石膏处理土壤全磷含量无明显变化,速效磷降低,无机磷含量升高;脱硫石膏施入土壤无机磷的增加主要以Ca2-P和Ca8-P态为主,无机磷平均含量增加的变化顺序依次为Ca2-P>Ca8-P>Fe-P>O-P>Al-P>Ca10-P。Ca8-P可作为潜在磷源,成为Ca2-P的有效补充,土壤有效磷的降低和无机磷组分磷酸钙盐增加在一定范围内未影响到油葵对磷素的吸收,22.5×103~33.75×103 kg/hm2脱硫石膏施用量对重度碱化土壤磷素营养最为有利,过量施用对油葵生长不利。总之,脱硫石膏改良引起碱化土壤无机磷组成变化是控制磷素营养的重要机制。To investigate the mechanism of flue gas desulfurization gypsum(FGDG)on the availability of phosphorus in sodic soil, a field experiment was performed to examine the effect of FGDP on the soil total phosphorus, available phosphorus and fractions of inorganic phosphorus. The results indica- ted that the total P content of the sodic soils added FGDP were no significant change, and the available P content were lower, and the inorganic P were higher than control. The addition of FGDP increased the concentration of calcium (Ca)-P (mainly Ca2-P and Ca8-P) compared to the control. The sequences of inorganic P content of soils improved by different amounts FGDG were followed Ca2-P〉Ca8-P〉 Fe-P〉 O-P〉 A1-P 〉Cal0-P. Under added FGDP treatments, Cas-P were the valid complement of Ca2-P. The ability of sunflower absorbed phosphorus were not affected by reduction of soil a- vailable P and (Ca)-P within a certain range. Because added excessive FGDP could affected growth and development of sunflower,the 22.5 x 103 ---33.75 x 103 kg/hm2 FGDG application dosage were the best for severe sodic soil. It is concluded that added FGDP affects P availability of soil by changing fractions of IP.
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