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以不同深松方式和施氮量下玉米群体光合特性的变化为研究内容,从群体角度探讨深松与施氮对光合作用的调控机制。结果表明:通过深松与施氮均可使平均相对叶面积指数(MRLAI)增加,在N2(纯氮225kg/hm2)水平时MRLAI的增加幅度最大,其次是N1(纯氮112.5kg/hm2)和N3(纯氮337.5kg/hm2)。通过深松可提高各施氮水平的MRLAI。适量增施氮肥可使LAI增长速率和群体光合势(LAD)增加,施氮量过高使LAI增长速率和群体LAD下降。深松并结合施氮,能更好地促进群体总LAD的增加,深松处理间对群体总LAD的增加作用T2(隔行深松)大于T1(行行深松)。
The photosynthetic characteristics of maize populations under different subsoiling regimes and nitrogen application rates were investigated. The regulation mechanism of subsoiling and nitrogen application on photosynthesis was discussed from a population perspective. The results showed that the average relative leaf area index (MRLAI) was increased by both subsoiling and nitrogen application, and MRLAI increased most significantly at N2 (225 kg / hm2 of pure nitrogen), followed by N1 (pure nitrogen 112.5 kg / hm2) And N3 (pure nitrogen 337.5 kg / hm2). By subsoiling can improve the level of nitrogen fertilizer MRLAI. Appropriate amount of nitrogen fertilizer increased the LAI growth rate and population photosynthetic potential (LAD), while excessive nitrogen application decreased the LAI growth rate and population LAD. Deep subsoiling combined with nitrogen application can promote the increase of total LAD. The effect of subsoiling on total LAD in subsoiling is greater than that of T1 (deep relaxation).