摘要
近几年,随着重庆＂森林工程＂全面启动,重庆西部主要区县充分利用当地有利自然条件,大规模发展速生桉树人工用材林。种植桉树需5年以上才能产生经济效益,因此,开展幼龄林林下种植成为以短养长、提高桉农收益的有效途径。但很多研究发现：桉树不仅具有较强的水、肥竞争力,而且作为一种外来树种,
In order to guide scientifically planting on forest floor in eucalyptus plantations, screen suitable plants, and understand allelopathic effects of eucalyptus trees with different young ages （1 a, 2 a and 3 a） on the understory species and growth germination rate and seedling growth of five species widely planted in the local region were measured after treatments with different concentration of aqueous leaf extract of Eucalyptus urophylla×E.grandis treatments with different concentration. The results showed that the leaf extract reduced seed germination rate and inhibited seedling growth of all five species, and had a stronger inhibiting effect on radical than hypocotyl growth. The species tested in this study had different sensitivity to the leaf extract. The inhibition rate of Lolium perenne, Sorghum sudanense, Phaseolus aureus, Phaseolus vulgaris and Glycine max was 56.85%, 54.58%, 33.48%, 20.81%, 16.01%, respectively, among which Giycine max and Phaseolus vulgaris were the most insensitive to the leaf extract. The allelopathy of the leaf extract was concentration dependent, increasing with increase of the concentration, and low concentration （0.01 g·mL-1） had no significant influence on the species. Furthermore, the allelopathy aqueous leaf extract of E.urophylla×E.grandis to the five species had no significant difference with increase of their ages.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2011年第11期188-193,共6页
Scientia Silvae Sinicae
基金
林业公益性行业科研专项(201104043)
重庆森林工程建设科技支撑项目
教育部留学回国人员启动基金项目(2007)
三峡库区生态环境教育部重点实验室自由探索研究基金项目(2007)
关键词
幼龄尾巨桉
化感作用
种子萌发
幼苗生长
林下种植
young Eucalyptus urophylla×E.grandis
allelopathy
seed germination
seedling growth
underwood planting
