Palmer J W
Horticulture Research International, East Malling, West Malling, Kent ME19 6BJ, UK.
Tree Physiol. 1992 Jul;11(1):19-33. doi: 10.1093/treephys/11.1.19.
Fruit load was altered by flower thinning on three- and four-year-old, field-grown apple trees. Increasing fruit load led to increases in dry matter production per unit leaf area and partitioning to fruit and to decreases in fruit size, percentage fruit dry matter, dry matter partitioning to new shoot growth, thickening of existing woody tissue and root growth. Flower bud production for the following spring was also negatively affected by an increase in fruit load. Leaf photosynthesis was increased in cropping trees in July and August at the time of maximum fruit dry weight increase. Calculated light interception was linearly related to leaf area. The efficiency of conversion of intercepted photosynthetic active radiation to dry matter energy equivalents was 3.3% in heavily cropping trees and 1.8% in non-cropping trees. Total dry matter production was linearly related to both leaf area and light interception, but the variance accounted for by the regression was more than doubled if fruit dry matter or fruit number was included in the regression.
对三到四年生的田间苹果树进行疏花处理，改变了果实负载量。果实负载量增加导致单位叶面积干物质产量增加，且分配到果实中的比例增加，同时果实大小、果实干物质百分比、分配到新梢生长的干物质、现有木质组织的增粗以及根系生长均减少。来年春季的花芽产量也受到果实负载量增加的负面影响。在7月和8月果实干重增加最多的时候，结果树的叶片光合作用增强。计算得出的光截获量与叶面积呈线性关系。在重度结果的树中，截获的光合有效辐射转化为干物质能量当量的效率为3.3%，在非结果树中为1.8%。总干物质产量与叶面积和光截获量均呈线性关系，但如果在回归中纳入果实干物质或果实数量，回归所解释的方差会增加一倍多。
