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用_(15)N同位素稀释技术分别通过盆栽、小区和大田示范对比试验,研究了大豆与玉米植株在单作和混作系统中的氮行为和生态互补作用。结果表明,混作时玉米植株来自土壤氮比单播降低了9.13％～24.58％,来自肥料氮比单播时降低了7.15％～22.52％,减低了玉米植株对土壤和肥料氮的剧烈竞争。混作时大豆固定的氮除供本身生长发育用外,还能转
By means of _ (15) N isotope dilution technique, the nitrogen activities and ecological complementation of soybean and maize plants in single-cropping and mixed-cropping systems were studied respectively through pot experiments, plots and field experiments. The results showed that the maize plants decreased 9.13% -24.58% compared with unicast when mixed with maize, and decreased 7.15% -22.52% when compared with unicrobed manure, which reduced the intense competition of maize plants for soil and fertilizer nitrogen. When mixed with nitrogen in addition to its own growth and development of soybeans, but also turn