华北落叶松8个优良家系的种子萌发及苗期生长特性

为了比较华北落叶松初选优良家系的种子萌发特性和苗期生长性状,对8个家系和种子园混合株系、母树林及人工林种子的千粒重、饱满率等表型性状,室内发芽率和圃地发芽率等萌发特性,2a生苗的苗高、地径、生物量等生长性状进行了测量分析,结果表明:华北落叶松家系46、家系75、家系9和家系74的发芽率分别为96.00%、78.00%、90.00%和94.67%,苗高分别为35.6cm、33.0cm、32.8cm和31.4cm,地径分别为5.43mm、6.06mm、5.47mm和5.39mm;这4个家系在发芽指数、苗高和地径方面综合表现好于种子园、母树林和人工林,其隶属函数值为人工林的4倍以上,较母树林和种子园也高出35%以上。

Seed germination and seedling growth characteristics of eight Larix principis-rupprechtii families

Phenotypic traits (thousand seed weight and plumpness,etc.),germination characteristics (germination rate and nursery germination rate,etc.) and growth traits (seedling height,basal diameter,biomass,etc.) of 8 superior families and 3 controls (seed orchard,seed production stand and planted forest) were measured and analyzed to compare seed germination and seedling growth characteristics of Larix principis-rupprechtii families.Results showed that families 46,75,9 and 74 performed excellent in aspect of germination rate,height and basal diameter.Their germination rates were 96.00％,78.00％,90.00％,and 94.67％;seedling heights were 35.6 cm,33.0 cm,32.8 cm,and 31.4 cm;basal diameters were 5.43 mm,6.06 mm,5.47 mm and 5.39 mm respectively.Their membership function value of germination index,height and basal diameter were 4 times more than planted forest,and was also 35％ higher than the seed orchard and seed production stand.