大豆群体冠层叶粒关系及其分布的研究

Study on Relation Between Leaves and Grains of Soybean Population and Their Distribution in Vertical Direction

不同类型大豆品种（品系）各节位叶面积与粒重相关系数达到显著或极显著；单株叶面积和单株产量呈极显著正相关，单株粒叶比和单株产量亦呈显著正相关。亚有限类型剪上层叶、无限类型剪中层时，单株产量降幅最大。鼓粒期ＬＡＩ和成熟期粒重比例，亚有限类型上层最高、中层次之．无限类型中层最高、上层次之；亚有限类型以上层、无限类型以中层为产量主导层次。生产实践中应采取适当措施，注意发挥主导层次生产潜能，以便进一步提高大豆单产水平。

Coefficient of correlation between leaf area and grain weight at different nodes of different types of soybeans shown 0.05/0.01 signifcant level;coefficient of correlation between leaf area of per plant and yield of per plant Shown 0.01 significant level;coefficient of correlation between ratioes of seed/leaf of per plant and yield of per plant shown 0.01 significant level. Removing both upper layer leaves for semi-determinate varieties and middle layer leaves for indeterminate ones decreased yield of per plant most significantly.Sink/source of top layer for semi-determinate varieties and bottom layer for indeterminate ones is the highest.Rate of LAI in fillng stage and seed weight at maturity is the hishest at the part of top for semi-determinate varieties (strains) as well as at the part of middle for indeterminate ones,and the second at the Part of middle for semideterminate ones as well as at the part of top for indetetminate ones.Key portion of the yield is at the part of top for semi-determinate vlrieties (strains) and at the part of middle for indeterminate ones It is important to adopt slitable management and tap the potential of key portion for increasing soybean yield significantly.