高寒地区羊茅属4种牧草种子产量及构成因子的研究

Seed Yield and Yield Components of Four Festuca L. Species in Alpine Region

在高海拔区对羊茅属(Festuca L.)4种牧草的种子产量及其产量构成因子进行比较研究,以期为高寒地区羊茅属牧草种子生产提供理论依据。结果表明:4种牧草的种子产量随生长年限的增加表现出y=a+bx+cx2变化趋势,其中青海中华羊茅(Festucasinensis Keng cv.Qinghai)种子生产性能在供试材料中表现最好(平均产量368.0kg.hm-2),其次为西北羊茅(F.ryloviana Rererd.)和毛稃羊茅(F.kirilovii Steud.)(180 kg.hm-2),蛊羊茅(F.fascinata)最低(72.3 kg.hm-2)。种子产量与单序籽粒数、单序小穗数、单序小花数、单株穗重、千粒重、花序长、种子长呈极显著或显著正相关;单序小穗数对种子产量影响直接效应最大,是影响种子产量的主要因子。

The seed yield and yield components of 4 Festuca L.species were compared to provide a reference for seeds production in Alpine region.Results showed that the relationships between the seed yield of 4 Festuca L.species and growth years are presented by y=a＋bx＋cx2.Seed yield of F.sinensis cv.Qinghai is the highest（368.0 kg·hm-2） among tested species.The second is F.ryloviana and F.kirilovii.Seeds production of F.fascinate is the lowest（72.3 kg·hm-2） among tested species.There are significant positive correlations between seed yields and seed numbers per inflorescence,spikelet per inflorescence,seed weight per inflorescence,1000-grain weight,length of seed as well as length of inflorescence.Spikelet per inflorescence has a greater effect on seed yields,and is a mainly factor of seed yields.