树冠形状对成龄山楂树生长发育的影响

树形是影响成龄山楂树生长发育的一个重要因素。调查结果表明,少主枝疏层形比多主枝自然圆头形树冠内各部位光照强度高,叶片栅状组织厚,叶绿素含最高0.37mg/dm~2,光合强度高1.21～2.68mg/(dm~2.h)。花序座果率和花朵座果率分别高12.61％和17.0％。健壮的发育枝和结果枝数量多,比倒大,叶面积指数高,高功能叶多10.60％,叶效值大1220。

THE INFLUENCE OF THE CROWN FORM ON THE GROWTH AND DEVELOPMENT OF ADULT HAWTHERN TREES

The crown form is an important factor which influences the growth and development of the adult hawthorn trees. The result of the investigation indicates that the thin layer form with fewer branches is superior to the natural rounhead form with many branches by having lots of advantages, such as high light intensity, thick palisade tissue in leaves, chlorophyll contents increased by 0.370mg/dm~2, photosynthetic intensity increased by 1.21—2.68mg/(dm~2.hr), the inflorescence fruit setting percentage increased by 12.61% and flower fruit setting percentage increased by 7.0%. In addition, there are more strong vegetative and fruiting branches in a high proportion LAI is also high and the higher functional leaves have increased by 10.90%. The leaf effective value increases by 1220.