红皮云杉人工林树冠特征与生长形质的关系及间伐与修枝对其影响OA北大核心CSTPCD

The objectives of this study were to understand the relationship between canopy morphological characteristics and growth characters of Picea koraiensis in plantations,to analyze the effects of different thinning and pruning combinations on crown characteristics and growth quality,to clarify the intensity of tending management measures,and to provide reference for the establishment of large-diameter timber cul-tivation technology of P.koraiensis.The artificial middle-aged forests of 47 a P.koraiensis in Mengjiagang Forest Farm of Jiamusi City in Heilongjiang Province was taken as the research object.The growth shape and quality of the forest were comprehensively evaluated by multi-objective one-dimensional comparison method,and the relationship between the canopy morphological characteristics and growth characters as well as the comprehensive evaluation value were analyzed by path analysis method.The effects of different combinations of thinning and pruning on the growth of the forest were clarified.The results showed that crown width and crown shape rate had significantly positive effects on tree height,diameter at breast height,individual wood volume,length of non-knot timber and growth quality,but crown length rate had a significantly negative effect(P＜0.05),while crown width and crown shape rate had a significantly nega-tive effect on breast height form factor and crown length rate had significantly positive effect(P＜0.05).The effects of crown characteristics on the growth and morphological traits of P.koraiensis varied in im-portance,with crown width,crown length and crown shape in descending order of relative importance.The effects of pruning on crown morphological characteristics,height under live branches,number of trees at breast height,and the overall index of growth and form quality were not significant(P＞0.05)with the in-crease of intercutting intensity and the decrease of pruning intensity.The tree height,diameter at breast height and wood volume per plant increased and had significant differences(P＜0.05).The canopy mor-phological trait factor had a significant direct effect on the growth morphological trait factor of P.koraien-sis.The cultivation of large-diameter P.koraiensis requires firstly a wide crown width,and secondly a nar-row crown shape and a small crown length rate.The management of high intensity thinning and low inten-sity pruning(30％thinning and 1/5 height pruning)can promote the growth of tree height and diameter at breast height in middle-aged P.koraiensis spruce forests.