北京郊区潮土中镁素释放特点及对作物的有效性
DOI: 10.3321/j.issn:1000-7091.2000.01.018, PP. 86-91
Keywords: 潮土,土壤镁,释放,耗竭,动力学方程
Abstract:
通过室内模拟试验、生物耗竭试验和连续流动交换试验，研究了昌平、大兴两处潮土中镁释放特点。尽管两处土壤中交换态镁含量较高，但随种植茬数增加，交换态镁含量下降，六茬植物镁的总吸收量中，非交换态镁的贡献率将近50%。大兴处土壤镁释放能力好于昌平处土壤，释放量高。600min内用0.5mol/L中性NH4AC连续流动交换镁释放过程，以抛物线扩散方程拟合最好。
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