摘要
研究表明,0~15cm矿化出来的氮素最多,但对作物吸氮量的贡献并非最大,贡献最大的出现在较深的层次。总体来看,对作物吸氮有重要意义的是上部土壤的可矿化氮:旱区为0~45cm土层;灌区为0~30cm土层。然而,即使是上部土壤的可矿化氮,由于测定方法不同,其反映土壤供氮能力的效果也明显不同。本研究再一次表明,通气培养法优于淹水培养法和碱解扩散法。
Field trials show that the amounts of nitrogen mineralized from 0~15cm soil layer are themost, but not the greatest in contribution to plant uptake nitrogen, the greatest contribution beingfrom deeper layers. As a whole, mineralizable nitrogen in upper layers(0~45cm for fields withno irrigation,and 0~30 cm for fields with irrigation) plays an important role in plant uptake nitrogen. However, mineralizable nitrogen determined by different methods from upper layers hasobviously different effects on reflecting soil nitrogen-supplying capacities. This research proves a-gain that aerobic incubation method is better than waterlogged incubation and NaOH-hydrolyza-tion diffusion methods.
出处
《干旱地区农业研究》
CSCD
北大核心
1993年第S1期68-73,共6页
Agricultural Research in the Arid Areas
基金
陕西省农牧厅资助项目
关键词
0~100cm各层
可矿化氮
土壤供氮能力
吸氮量
different layers from 0 to 100cm
mineralizable nitrogen
soil nitrogen--supplying capacities
nitrogen uptake by plant