绿肥分解产物中水溶性有机物质的伏安行为及其影响因素

VOLTAMMETRIC BEHAVIOR OF WATER-SOLUBLE ORGANIC SUBSTANCES IN DECOMPOSITION PRODUCTS OF GREEN MANURES AND ITS EFFECTING FACTORS

绿肥分解产物中的水溶性有机物质的峰数和电流值随绿肥培养时间和种类而异。分子量为120—130和140—160的水溶性有机物质具有明显的伏安行为,大于160者则贡献较小或无贡献。pH、亚铁和土壤类型对水溶性有机物质的伏安行为有显著影响。

Both the peak number and peak current value of water-soluble organic substances for decomposition, products of green manures varied with the incubation time and also with the kind of green manures. The peak number and current value were the most and largest after 5-day incubation. Astragalus had more peaks and larger current value than rice straw. The latter possesed one peak after 120-day incubation, but for the former the peak and peak current tended to disappear. The substances with molecule weight 120—160 possesed apparent voltammetric behavior and those with more than 160 were indistinct or of no contribution. It was found that peak current value decreased with the fall of pH, certain peaks disappearing at pH 5; The addition of ferrous iron induced a decrease in current value; under the influence of soil adsorption and iron oxide, some substances with lower peak potential disappeared, especially for the treatment adding laterite and red earth.