The Effection of Phosphorus Adsorption and Desorption of Long-term Fertilization on South Yellow Clayey Soil
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摘要: 在连续施肥26年南方黄泥田上进行土壤磷的吸附-解吸特征试验。结果表明,不同施肥处理土壤磷的等温吸附曲线与Langmuir方程拟合性较好(P0.01)。与单施化肥相比,化肥与牛粪或化肥与秸秆长期配施能降低土壤磷吸附亲合力常数(K)、吸附缓冲容量(MBC),提高土壤磷吸附饱和度(DPS);但土壤P最大吸附量(Xm)二者表现相反的趋势。化肥与牛粪配施土壤吸附的磷在低浓度时更容易解吸,而随着浓度的升高有降低趋势。有机无机肥配施在低磷条件下(20 mgkg-1)土壤磷主要表现出源功能,而在高浓度条件下土壤磷主要表现汇的功能。Abstract: The characterization of adsorption and desorption of soil phosphorus is investigated in the 26th year of long-term fertilization south yellow soil. The result indicated that there is good fitness between the adsorbed curves of the Langmuir equation phosphorus and the Langmuir equation(P0.01). Compared with single fertilization, long-term applying of both fertilizer and dairy manure or straw can decrease K、MBC and crease DPS. However, there is a crosscurrent between Xm. P which will be desorbed more easily under the combined application of fertilizer and dairy manure when its concentration is low, and that will be opposite as the concentration ascends. Under the combined application of organic fertilizer and chemical fertilizer, P acts as a headstream with a low concentration while it acts as a sea with a high concentration.
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Key words:
- long-term fertilization /
- yellow clayey soil /
- phosphorus /
- adsorption /
- desorption
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