富士苹果不套袋与套袋密度对果树冠层光学特性的影响

Effects of Unbagging and Bagging Density on Canopy Photometric Characteristics of “Red Fuji” Apple Tree

研究了不套袋及不同套袋密度对苹果树冠层结构参数的影响,以及套袋前、后冠层光环境的差异。研究结果表明:套袋处理苹果树的叶面积指数明显高于不套袋对照的,且其随着套袋密度的增加而显著增加;在摘袋后3 d,套袋密度2/3处理和全树套袋处理的叶面积指数仍然高于不套袋对照的;纸袋的遮挡系数随着套袋密度的增加而明显增加;套袋处理总体上使果园的散射透过率(TD)、直射透过率(TR)有不同程度的降低,但增加了叶分布(LD),其中以全树套袋处理的影响最为明显。

The author studied the effects of unbagging and bagging density on the canopy structure parameters and light environment of "Red Fuji" apple trees. The results showed that: the leaf area index of apple trees in bagging treatments was obviously higher than that in unbagging control, and it significantly increased with the increase in bagging density;on the third day after removing bags, the leaf area index of apple trees in 2/3 bagging density treatment and whole tree bagging treatment was still higher than that in unbagging control;the occlusion coefficient of paper bags markedly increased with the increase in bagging density;in general, the bagging treatments reduced the scattering transmittance(TD) and direct transmittance(TR) of apple orchards to a certain extent, but increased the leaf distribution(LD), and the whole tree bagging treatment had the most obvious effects among different bagging treatments.