地肤水浸提液对胡麻化感效应的研究

 采用生物测定法研究了地肤及其不同部位水浸提液对胡麻的化感效应。结果表明，１）不同浓度的地肤全株及地上部茎叶水浸提液对胡麻种子萌发和幼苗生长有不同程度的抑制作用，抑制率均随浸提液浓度的升高而增大，０．１００ｇ／ｍＬ 处理对胡麻种子的发芽势、发芽率、发芽指数、活力指数及幼苗的根长、苗高、根鲜重和苗鲜重的抑制率均达１００％。２）地肤水浸提液抑制胡麻种子萌发主要是抑制了活力指数，抑制胡麻幼苗生长主要是抑制了根的生长。３）地肤释放化感物质可能有多种途径（如地上部淋溶、根系分泌等），但从综合效应看，同一浓度处理均以地上部化感作用最强，根系化感作用最弱。

Allelopathy of aqueous extracts of Kochia scoparia on flaxseed

Allelopathy of aqueous extracts of Kochia scoparia and its different parts on flax (Linum usitatissimum) were tested by the methods of bioassay. The results showed: 1) Different concentration of K. scoparia and its stem and leaf aqueous extracts have different degree's inhibition on flaxseed germination and seedling growth, and the inhibition rate increased with the increasing concentration of extract, 0.100 g/mL whole plant and its stem and leaf aqueous extracts of K. scoparia have 100% inhibition rate to the germination energy, germination rate, germination index, vigor index and root length, shoot height, root fresh weight and shoot fresh weight.2) The aqueous extracts of K. scoparia inhibit flaxseed germination was mainly because they inhibit vigor index, and they inhibit the growth of flax seedlings was mainly because they inhibit root growth. 3) K. scoparia aqueous extracts showed allelopathy effect to the germination and seedling growth of flaxseed, which indicated that K. scoparia release allelochemicals in various ways (such as rainoff eluviation, root excretion, etc.). But according to the inhibition synthesis effect, at the same concentration of aqueous extracts, the stem and leaf has the strongest allelopathy on flaxseed, and the root has the least allelopathy.