黄土高原地形对苜蓿种子产量和质量的影响  

Effect of topography on seed yield and quality of alfalfa grown in the Loess Plateau

作　　者：余玲[1] 王彦荣[1] 毛玉林[1] 侯扶江[1] 

机构地区：[1]兰州大学草地农业科技学院,甘肃草原生态研究所兰州730020

出　　处：《草业学报》2002年第4期62-67,共6页Acta Prataculturae Sinica

基　　金：国家重点基础研究发展规划项目 (G2 0 0 0 0 1 860 2 );中澳合作项目 (AS1 /1 9980 2 6)共同资助。

摘　　要：对产自甘肃环县黄土高原沟壑区阴坡、阳坡、沟谷阶地和塬地 4种地形的苜蓿种子产量和质量进行了研究分析。结果表明 ,地形对种子产量和质量均有显著影响。其中 ,阴坡种子产量最低 ,分别为 1.86 g/株和 311.74kg/ hm2 ,阳坡单株种子产量最高 ,为 6 .4 1g/株 ,塬地单位面积种子产量最高 ,为 6 5 0 .6 5 kg/ hm2 ;质量最低种子也产自阴坡 ,其发芽率只有 2 3% ,硬实率却高达 6 6 %。地形对种子产量构成因素无显著影响 ;4种地形的种子产量与其构成因素的相关性完全一致 ,即除千粒重外 ,种子产量与其他各因素均存在显著正相关 ;相关性强弱依次为 :单株生殖枝数 >每生殖枝荚果数 >每荚粒数 >千粒重 ;单株生殖枝数对种子产量贡献最大。Alfalfa seed yield and quality were studied on shady slope,sunny slope,valley land and flat land in the Loess Plateau, Huan county, Gansu province. The results indicated that there were significant effects of topography on seed yield and quality. The lowest seed yields measured both in yield/plant and yield per/ha were produced on the shady slope which was 1.86 g/plant and 311.74 kg/ha, respectively. The sunny slope produced the highest seed yield per plant which was 6.41 g/plant, and the flat land produced the highest seed yield per ha which reached 650.65 kg/ha. The hard seed contents were the highest among the seed harvested from shady slope which was 66% and the germination was the lowest which was only 24%. There were not significant effects of topography on seed yield components. Correlations between seed yield and yield components for 4 landforms were similar. The major seed yield components in order of decreasing importance were: number of fertile shoots/plant, number of pods/fertile shoot, number of seeds/pod, thousand seed weight.

关 键 词：黄土高原 地形 苜蓿种子 产量 质量 

分 类 号：S541.9[农业科学—作物学]