天然沸石对磷、钾在红壤中迁移影响的室内模拟研究

为了寻求提高磷钾肥利用率的途径，该文采用恒温振荡试验初步研究了天然沸石对水溶性磷、钾在红壤中向无效态转化的影响。结果表明：添加沸石降低了水溶性磷、钾含量，增加了解吸钾量；解吸磷和有效磷在磷酸二氢钾低水平时比对照均降低；在磷酸二氢钾高水平时，前者降低而后者增加了9.6%～32.2%。在富磷的红壤中添加沸石提高了有效磷含量，降低了磷损失的可能性；沸石在红壤中作为钾库和钾源，可调节土壤钾水平。

Laboratory simulation of effects of native clinoptilolite on phosphorus and potassium mobilization in red soil

In order to improve the nutrient efficiency,batch-experiments were conducted to preliminarily study the effects of native clinoptilolite on the unavailable process of water-dissolvable phosphorus and potassium in red soil.Results show that with the clinoptilolite additions,the concentrion of phosphorus and potassium in solution decreases,and the potassium extracted by CaCl_2 increases.The extractable and available phosphorus concentrations in the treatments with clinoptilolite addition decrease in contrast with no clinoptilolite addition at the low level of monopotassium phosphorus;the former is decreased and the latter is increased(9.6%)~(32.2%) at the high level.In red soil,clinoptilolite increases the available phosphorus concentration and decreases the probability of phosphorus pollution in soils with high application of phosphorus fertilizer or high phosphorus concentration.For potassium,native clinoptilolite can be as a sink or a source,which maintains a good potassium concentration.