摘要
以玉屏大板栗为材料，探索了树冠内光能分布特征，以及光能分布对叶片形态、结构和座果的影响。结果表明，大阳光能穿透叶幕层时，光强消减规律合符Ｂｅｅｒ－Ｌａｍｂｅｒｔ公式，８年生植株的关系式为Ｉ＝Ｉ０ｅ－０．４４５９Ｆ，而１５年生植株的关系式为Ｉ＝Ｉ０ｅ－０．４４２８Ｆ。叶幕内的光能分布主要受累计叶面积指数和自然光强的影响。随着叶幕光强的降低，单叶面积，叶片与所座生枝条夹角变大，叶片厚度、表皮厚度、栅栏组织厚度、栅栏细胞层数及栅栏细胞宽长比降低。海绵组织孔隙度增加，但海绵组织厚度、海绵细胞形状变化不大。叶幕内的光能分布对总艺的分布也有重大影响，８年生植株总苞主要分布于相对光强１３％以上的叶幕层，而１５年生植株总艺主要集中于相对光强１０％以上的叶幕层。另外，还探讨了生产上合理的树体特征。
The light distribution and its influences on foliage, fruit-setting in the canopy of Chinese chestnut (Castaneamollissuma. Cv. Yupingdabanli ) were studied. The results showed that light intensity in varied with the sunlight intensity and accumulated leaf area index (LAI). aam correlationship between LAIand light intensity conformed to Beer-Lambert equation . The regressive equation of 8-year-old and 15-year - old trce were and respectively. With the reduction of light intensity,leaf area, declinate angle of leaf became greater while stomatal density, leaf thickness, epideremis thickness,palsade tissue thickness, layer of palisade cell, and width/length ratio of palisade cell decreased. Althoughthe porosity of spongy tissue increased, no significant changes of spongy tissue thickness and spongy parenchymatous cell shape were observed. Light intensity influenced significantly involucrum, which distributed in the canopy with the relative light intensity hither than 13 % of 8-year-old boos trees 10% of 15-year-old trees. According to the results, some suggestions on rational canopy were put forward.
基金
省教委基金
关键词
板栗
树冠
光能分布
叶片结构
座果
Chinese chestnut
canopy
light distribution
foliage anotomy
fruit-setting
