CAJ | 학술논문

以板栗主栽品种12年生‘燕山早丰’为试材，选择主枝数和主枝开张角度不同的自然开心形树形，采用WinsCanopy 2006 a冠层分析仪和Li-6400光合仪分别测定冠层光辐射特征参数与光合特性，并调查了枝条类型及果实产量。结果表明：主枝数和主枝开张角度对板栗自然开心形树体单位面积枝条数无显著影响；三主枝树体的壮枝比例显著（P＜0．05）高于四主枝和五主枝的；增加主枝开张角度能够提高板栗的冠层开度和冠下总辐射；主枝数和主枝开张角度不同的树体，冠层下部的净光合速率和冠层上部的水分利用效率均存在显著差异（P＜0．01），且三主枝、开张角度大于60°时，净光合速率和水分利用效率最高，以及树体单位面积产量也达到最高，为0．225 kg· m-2。自然开心形‘燕山早丰’最适宜的树体结构是三主枝且开张角度大于60°。
이판률주재품충12년생‘연산조봉’위시재，선택주지수화주지개장각도불동적자연개심형수형，채용WinsCanopy 2006 a관층분석의화Li-6400광합의분별측정관층광복사특정삼수여광합특성，병조사료지조류형급과실산량。결과표명：주지수화주지개장각도대판률자연개심형수체단위면적지조수무현저영향；삼주지수체적장지비례현저（P＜0．05）고우사주지화오주지적；증가주지개장각도능구제고판률적관층개도화관하총복사；주지수화주지개장각도불동적수체，관층하부적정광합속솔화관층상부적수분이용효솔균존재현저차이（P＜0．01），차삼주지、개장각도대우60°시，정광합속솔화수분이용효솔최고，이급수체단위면적산량야체도최고，위0．225 kg· m-2。자연개심형‘연산조봉’최괄의적수체결구시삼주지차개장각도대우60°。
With 12 years old chestnut ( Castanea mollissima Bl.) ‘yanshanzaofeng ’ , we chose different main branch number and main branch opening angle trees with natural open center shape to determine the parameters of canopy light radiation characteristic by WinsCanopy 2006 a, the photosynthesis of different canopy by Li-6400 , the shoots types and the fruit yield of different tree structures.There are no significant differences between different main branch number and main branch opening angle on the shoots number of unit area.The strong shoot proportion of three main branches is the largest than that of four and five branches .Openness and canopy radiation increase with the increasing of the opening angle ( P<0.05).There are significant differences (P<0.01) among lower Pn and the upperW U,E of different tree structures.Three main branches with opening angle over 60°have the highest Pn and WU,E , and the highest yield of unit area of 0.225 kg· m-2 .The best suitable tree structure for natural open center shape chestnut cultivar‘Yanshanzaofeng ’ is three main bran-ches with opening angleover 60°.