黄土高原丘陵沟壑区紫花苜蓿品种间根系发育能力的初步研究

应用生态学报 ›› 2002, Vol. ›› Issue (8): 1007-1012.

黄土高原丘陵沟壑区紫花苜蓿品种间根系发育能力的初步研究

郭正刚^1,2, 张自和², 肖金玉², 侯扶江², 陆妮²

1. 中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室, 兰州 730000;兰州大学草地农业科技学院, 甘肃省草原生态研究所, 兰州 730020

收稿日期:2002-04-07 修回日期:2002-05-09 出版日期:2002-08-15
通讯作者: 郭正刚,男,1973年生,助理研究员,在职博士,主要从事区域生态环境建设方面的研究,发表论文8篇,专著1部.E-mail:ggeri@public.lz.gs.cn
基金资助:
国家重点基础研究发展规划项目(G2000018602);国家重点科技攻关计划资助项目(2000K010401).

Root system development ability of several alfalfa cultivars in the hilly and valley regions of Loess Plateau

GUO Zhenggang^1,2, ZHANG Zihe², XIAO Jinyu², HOU Fujiang², LU Ni ²

1. State Key Laboratary of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research, Chinese Academy of Sciences, Lanzhou 730000;
2. College of Pastoral Agriculture Science and Technology, Lanzhou University, Gansu Grassland Ecological Research Institute, Lanzhou 730020

Received:2002-04-07 Revised:2002-05-09 Online:2002-08-15

摘要/Abstract

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10～20cm的主根段,50cm以下没有侧根发生,品种间侧根发生总数以Sandili和Ameristand201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,Amerigraze401,Ameristand201在土壤20～30cm层的根系体积和生物量大于10～20cm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Ameristand201最大,为170.54g,陇东苜蓿最低,仅为38.25g,是Ameristand201的22.4%;品种占有的地下资源空间Ameristand201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,Amerigraze401和Ameristand201在黄土高原丘陵沟壑区根系发育良好.

关键词: 紫花苜蓿, 品种, 根系生物量, 根系分布

Abstract: Afield 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 on9 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.

Key words: Alfalfa, Cultivar, Root system biomass, Root system distribution

中图分类号:

S551.702

郭正刚, 张自和, 肖金玉, 侯扶江, 陆妮. 黄土高原丘陵沟壑区紫花苜蓿品种间根系发育能力的初步研究[J]. 应用生态学报, 2002, (8): 1007-1012.

GUO Zhenggang, ZHANG Zihe, XIAO Jinyu, HOU Fujiang, LU Ni . Root system development ability of several alfalfa cultivars in the hilly and valley regions of Loess Plateau[J]. Chinese Journal of Applied Ecology, 2002, (8): 1007-1012.

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