膨润土固氮机理及膨润土碳铵对土壤养分的影响

Nitrogen Fixation Mechanism of Bentonite and Effect of Bentonite Adsorbed Ammonium Bicarbonate on Soil Nutrient

研究了膨润土的固氮机理及“膨润土碳铵”对土壤养分的影响。结果表明:膨润土吸附NH_4^+后,蒙脱石的层间距显著缩小;水充足时NH_4^+取代更彻底;连年施用膨润土碳铵后,土壤全氮仍能维持平衡状态,与施用普通碳铵相比,表层有效磷增加0.1mg/kg、有效钾增加4～9mg/kg。

The nitrogen fixation mechanism of bentonite mixed with ammonium bicarbonate and the effect of bentonite adsorbed ammonium bicarbonate on soil nutrient were studied. The results indicated that the space between layers in bentonite notably decreased after adsorbing NH4+. The substitution of NH4- would be more complete under sufficient water. The nitrogen content in soil could still maintain its balance after continuous application of bentonite adsorbed ammonium bicarbonate year by year. Compared with the application of simple ammonium bicarbonate, the content of effective phosphorus in topsoil increased 0. 1 mg/kg, and the content of effective potassium increased 4-9 mg/kg.