摘要
研究了 9个紫花苜蓿品种在黄土高原丘陵沟壑区根系的发育能力 .结果表明 ,紫花苜蓿侧根发生的主要部位在距地表 10～ 2 0cm的主根段 ,5 0cm以下没有侧根发生 ,品种间侧根发生总数以Sandili和Ameristand 2 0 1最大 ,陇东苜蓿最低 ;品种间根系体积和生物量的垂直分布 ,除Sandili,Amerigraze 4 0 1,Ameristand 2 0 1在土壤 2 0～ 30cm层的根系体积和生物量大于 10～ 2 0cm层的根系体积和生物量外 ,其余品种表现为从土壤表层到深层逐次递减 ;品种间根系生物量以Ameristand 2 0 1最大 ,为 170 .5 4 g ,陇东苜蓿最低 ,仅为 38.2 5 g ,是Ameristand 2 0 1的 2 2 .4 % ;品种占有的地下资源空间Ameristand 2 0 1和Sandili较大 ,陇东苜蓿最小 .经聚类分析 ,参试的 9个品种可分为 3类 ,其中Sandili,Amerigraze 4 0 1和Ameristand 2 0
A field study was conducted in the hilly and valley regions of Loess Plateau in Gansu Province to analyze the root system development ability of several alfalfa ( Medicago sativa ) cultivars.Eight introduced cultivars and one local cultivar were arranged in the same site.The secondary roots of alfalfa cultivars grew mainly from the taproot underground 10～20 cm depth,and there were no secondary roots below 50 cm depth.The total amount of secondary roots of Sandili and Ameristand 201 was the biggest,and that of Longdong alfalfa was the lowest. The volume and biomass of different cultivars were decreased from 0～10cm depth to below 50 cm depth, except those of Sandili and Ameristand 201 at 20～30cm depth was bigger than at 10～20cm depth. The biomass of Ameristand 201 was 170.54g and bigger than that of others, and that of Longdong alfalfa, which was 22.4% of Ameristand 201, was the lowest. According to cluster analysis on 9 alfalfa cultivars, Sandili, Ameristand 201 and Amerigraze 401 were suitable for planting on the hills and valleys of Loess Plateau due to their root system development ability.
出处
《应用生态学报》
CAS
CSCD
2002年第8期1007-1012,共6页
Chinese Journal of Applied Ecology
基金
国家重点基础研究发展规划项目 (G2 0 0 0 0 1860 2 )
国家重点科技攻关计划资助项目 (2 0 0 0 K0 1 0 4 0 1) .
