土壤氮素矿化与土壤供氮能力——Ⅰ.旱地土壤氮素矿化两种培养方法之比较

Soil Nitrogen Mineralization and Soil N-Supplymg CapacitiesI. Comparison of Two Incubation Methods for Measuring Dryland Soil Nitrogen Mineralizations

以有机质,全氮,C/N差异较大的20种田土和10种盆土,进行了长达262d的通气培养和121d淹水培养矿化试验。测定了土壤矿化氮的动态变化,建立了土壤氮素矿化累积曲线;根据矿化速率和容量,把整个土壤氮素矿化过程分为3个阶段,把盆土氮素矿化分为3个类型,田土分为4个类型。

Twenty and ten soils with a range of organic matter, total N and N:C ratios were separately used for pot and field experiments, and for 262 d aerobic incubation and 121 d waterlogged incubation. The dynamic of the mineralized N were measured, and the accumulated curves for N mineralized were established. Based on mineralization rates and capacities, the whole mineralization processes were devided into 3 stages, the soils for pot experiment into 3 types, and the soils for field experiments into 4 types.