【摘要】 本试验结合杏树物候期定期采集了一年生枝,新梢和根,分别观察了枝和根在年周期中淀粉含量的消长变化及其与生长发育的关系,以期从营养角度分析杏树落花落果严重的原因,并根据观察结果对杏树栽培管理提供了一些科学依据。更多还原

【Abstract】 This experiment was conducted both to ascertain the pattern of starch changes in relation to growth and development of apricot and to find out the reason causing flower and fruit drops of apricot, So as to propose some suggestions for apricot growing and managing. The result shows that there is an obvious pattern in relation to the starch content in apricot shoot and root in its annual cycle. The diagram of curve of starch content a11 the year around shows three peaks (late-o ctober, mid-February, and mid-April) and three lower points (late-April to-early May, mid-january and mid-March) There is an obvious exchanging period for its carbohydrate nutrition. This period appears during late-April to early-May in Baoding area. Exchanging period is a common phenomenon for many species of deciduous fruit tree. As for it begins early or late and lasts longer or shorter, varies with species and the level of growing and managing. There is a noticeable pattern in relation to the storage and utilization of carbohydrate in various tissues both in shoot and in root. It shows that starch storage is basically to transport from outer-part to inner-part gradue ally, i. e. phloem and cortex—→Xylem (mainly rays)—→pith, during thperiod from growing season to dormancy. In dormant season the storohause of starch is the pith and xylem-rays, whereas the order of utilization for starch is from innerpart to outerpart gradually, i. e. pith—→xylem-rays—→phloemrays—→cortex.Thestorehause of starch during growing season is mainly phloem—rays, cortox and xylem—rays. According to the result of this experiment, some suggestions were proposed theoretically for apricot growing and managing.更多还原