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1983～1984年,在江苏省吴县用方格法和分层法调查了18年生梅树的叶幕光能分布规律及其影响因素。结果表明,叶幕光能分布直接受叶面积系数、太阳位置和光强的影响。各层叶幕中的光能分布随自然光照的变化而改变,其日平均透光率大小和光照强度日变化范围均从叶幕外围向内膛随累计叶面积系数的增加而递减。叶幕结构直接决定其中的光能分布及其利用效率。生产中,宜通过整形修剪等农业技术措施,维持盛果期梅树高效光合生产的叶幕层厚度1.5m以上、有效叶面积系数5左右。充分提高梅树整个叶幕内光能分布的有效性,对增强树体的光合生产能力有重要的意义。
From 1983 to 1984, the law of leaf light energy distribution and its influencing factors in 18-year-old plum trees were investigated by squaring and stratification in Wu County, Jiangsu Province. The results show that the leaf light distribution is directly affected by leaf area index, solar position and light intensity. The distribution of light energy in the leaves of each layer changed with the change of natural light. The daily average light transmittance and the daily variation range of light intensity all decreased with the increase of accumulated leaf area coefficient from the periphery of leaves to the interior. Leaf curtain structure directly determines the light energy distribution and utilization efficiency. In production, it is advisable to maintain the leaf curtain thickness of 1.5m or more and effective leaf area factor of about 5% for high efficient photosynthetic production of plum tree in full fruit stage through agricultural techniques such as plastic trimming. It is of great significance to enhance the light energy distribution in the entire leaf of plum tree and enhance the photosynthetic production capacity of the tree.