叶片通过光合作用所合成的碳水化合物,一般称为干物质。苹果树在单位面积内的产量多少,主要取决于单位面积内叶片所合成的干物质的量。一般来讲,叶片干物质的生产量高,果实的产量亦高;反之亦然。但事实上也并非完全如此,因为叶片所合成的干物质,除供给果实外,还用于新梢、枝干和根的生长等。1983 The carbohydrates synthesized by photosynthesis by leaves are generally called dry matter. The production of apple trees per unit area depends largely on the amount of dry matter synthesized by the leaves per unit area. In general, leaf dry matter production is high, fruit yield is high, and vice versa. But in fact it is not exactly the case, because the blades of dry matter, in addition to the supply of fruit, but also for shoots, branches and roots growth and so on. 1983