狼毒浸提液对3种牧草种子萌发和幼苗生长的影响

doi:10.11686/cyxb2019122

摘要/Abstract

摘要： 采用培养皿滤纸法研究狼毒浸提液对紫花苜蓿、披碱草和冰草的化感作用,分析狼毒浸提液对3种牧草种子萌发和幼苗生长的作用规律和作用强度,以期为退化草原的恢复提供理论依据。结果表明:1)5种浓度梯度狼毒浸提液处理对紫花苜蓿种子发芽率均具有抑制作用,125 g·L^-1处理下种子发芽率较对照相比减少33.56%;对披碱草和冰草种子具有“低促高抑” 现象,25 g·L^-1处理下披碱草种子发芽率较对照增加19.76%,冰草增加 45.91%。2)狼毒浸提液对紫花苜蓿幼苗苗高呈现低浓度(≤50 g·L^-1)促进生长,高浓度(≥75 g·L^-1)抑制生长,对披碱草幼苗苗高呈现低浓度(≤25 g·L^-1)促进生长,高浓度(≥50 g·L^-1)抑制生长。狼毒浸提液对冰草幼苗根长具有抑制作用,较对照相比减少78.21%。狼毒浸提液处理下3种牧草种子萌发和幼苗生长均受到抑制作用,且随着狼毒浸提液浓度的增加,抑制作用逐渐增强。

关键词: 草原退化, 化感作用, 狼毒

Abstract: This research aimed to provide technical information relevant to the restoration of degraded grassland. We used a petri-dish method to study allelopathic effects of an extract of Stellera chamaejasme on the seed germination and seedling growth of three forage plant species: Medicago sativa, Elymus dahuricus and Agropyron cristatum. It was found that: 1) The germination rate of M. sativa seeds was inhibited in the presence of S. chamaejasme extract. With addition of 125 g·L^-1 of extract germination was deceased by 33.56% compared to CK. However, with the two grass species E. dahuricus and A. cristatum, addition of S. chamaejasme extract at low rates promoted germination, and addition at higher rates was inhibitory. Compared to CK, with addition of 25 g·L^-1 S. chamaejasme extract, the germination rate of the seeds of E. dahuricus was increased by 19.76%, and the germination rate of A. cristatum seeds was increased by 45.91%. 2) The seedling height of M. sativa was increased when exposed to S. chamaejasme extract concentrations ≤50 g·L^-1 and was decreased when exposed to extract concentration ≥75 g·L^-1, while the seedling height of E. dahuricus was increased when the extract concentration was ≤25 g·L^-1, and decreased at concentrations ≥50 g·L^-1. Finally, S. chamaejasme extract had an inhibitory effect on the root length of A. cristatum, with the root length decreased by 78.21% compared to CK. In summary, the seed germination and seedling growth of all three forage plant species tested were inhibited by treatment with S. chamaejasme extract, and the inhibition strength was enhanced with increasing concentration of the extract.

Key words: grassland degradation, allelopathy, Stellera chamaejasme

刘雅婧, 蒙仲举, 党晓宏, 宋文娟, 翟波. 狼毒浸提液对3种牧草种子萌发和幼苗生长的影响[J]. 草业学报, 2019, 28(8): 130-138.

LIU Ya-jing, MENG Zhong-ju, DANG Xiao-hong, SONG Wen-juan, ZHAI Bo. Allelopathic effects of Stellera chamaejasme on seed germination and seedling growth of alfalfa and two forage grasses[J]. Acta Prataculturae Sinica, 2019, 28(8): 130-138.

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