摘要
以12种质地、有机质、全氮、碳氮比不同的土壤进行盆栽试验,并用不同方法测定土壤的供氮能力,研究作物吸收氮与土壤测定值之间的关系。结果表明,作物吸收氮与土壤中的硝态氮有较好的一致性,而与铵态氮关系不大。淹水培养所矿化的氮素难以反映非淹水条件下土壤的供氮水平。通气培养2周所矿化的氮素与KCl煮沸法浸取的氮素均与作物吸收氮高度相关,且两者间有密切关系。这两种方法测定的氮素在反映土壤供氮能力上有同样价值。
Pot experiments using barley and ryegrass on 12 soils with different textures, organic matter, total nitrogen contents and C: N ratios were conducted and mineralized and mineralizible nitrogen in soils were determined by different methods in order to investigate the relationship between nitrogen uptake by plants and nitrogen in soils determined. The results obtained showed that N uptake by plants was well correlated with NO_3^--N in soils extracted either by saturated CaSO_4 or KCl, but less correlated with NH_4^+-N while the soils N mineralized after a 2-week aerobic incubation was closely related to plant uptake nitrogen, the soils N mineralized after a 1-week waterlogged incubation did not reflect the nitrogen supplying capacities of the soils in non-waterlogged condition. The soil N released by boiling KCl was found to be highly correlated with the N in plants, and also with the soil N mineraized after aerobic incubation. Both aerobic incubation and boiling KCl method have the same value in evaluation of soil nitrogen supplying capacities.
出处
《土壤学报》
CAS
CSCD
北大核心
1990年第3期233-240,共8页
Acta Pedologica Sinica
