大豆群体结构的研究

对大豆群体冠层上部实施不同比例的剪叶、去荚处理和运用二元多项式模型作了大豆群体“源、库”及产量的生长分析。结果表明:大豆群体的叶面积指数控制在5.1左右为最适宜。创造合适的群体“源、库”比,协调光合性能诸因素,是获取高产的关键。通过调整冠层叶面积的分布,提高群体中、下部的光强,可以达到提高产量的效果。文中还讨论了利用“源、库”理论来探索最适叶面积指数和群体结构的问题。

STUDY ON POPULATION STRUCTURE IN SOYBEAN

The artificial different light intensity popuiation with the same density were careated by removing different proportion of pods, leaves of soybean of upper canopy. The cubic polynomial model was found to fit the growth analysis of soybean population. The result indicated that the optimum leaf area index (LAI) of soybean population was 5.1, it was crucial to high-yielding that the relationship of leaf (source) and pod (sink) must be coordinative. By changing the distribution of leaf area in canopy, light intensity in mdiddle, bottom part of plants could be in creased and it improved the relationship between pod and leaf, and finally resulted in increasing population yield.To regulate population structure by using source-sink standpoint of view shall consider not only leaf quantity but also the interaction of source and sink. This provides a new method for studying crop population structure.