落叶松针叶内缩合单宁含量与树龄及家系的关系

为了研究树龄、家系和生长时期对落叶松组成抗性的影响,在7和8月采集落叶松针叶,对比分析了长白73-26(Larix olgensis 73-26)和73-28(L.olgensis 73-28),杂种日5×兴9(L.kaempferi 5×L.gmelinii9)和日3×兴2(L.kaempferi 3×L.gmelinii2)4个家系的不同年龄落叶松针叶内缩合单宁含量。结果表明:落叶松针叶内缩合单宁含量,受树龄×家系,树龄×家系×生长时期的交互效应影响差异显著。在幼龄林、中龄林和近熟林3个年龄等级中,幼龄林显著高于其他林龄,在4个家系中,杂种家系显著高于长白家系;同时,在落叶松生长旺盛的7月显著高于生长缓慢的8月,说明落叶松在7月组成抗性相对较强,幼龄林和杂种家系的组成抗性相对较强。因此,建议多种植抗性较强的杂种落叶松,同时在8月以后加强对中龄和近熟林木的防虫监护。

Relationships of condensed tannin content in larch needles with larch stand age and its family

In order to study the effects of larch stand age,its family,and growth period on the constitutive resistance of larch needles,the needles of Larix olgensis 73-26,L.olgensis 73-28,L.kaempferi 5×L.gmelinii 9,and L.kaempferi 3×L.gmelinii 2 in different stand age groups were collected in July and August,with their condensed tannin content analyzed.The condensed tannin content in larch needles differed significantly under the interactive effects of stand age×family and of stand age×family×growth period,being significantly higher in young than in middle-aged and near-matured stands,in L.kaempferi 5×L.gmelinii 9 and L.kaempferi 3×L.gmelinii 2 than in L.olgensis 73-26 and 73-28,and in July(fast growth period)than in August (slow growth period).It was suggested that more hybrid larch with stronger constitutive resistance should be planted,and the pest control for middle-aged and near-matured larch stands should be strengthened after August.