桃树根系浸提液对毛桃幼苗生长的化感效应

Allelopathic Effect of Extracts from Peach Tree Roots on Growth of Maotao

为了研究桃树根际自毒作用,探讨桃树连作障碍问题及其作用机理,以蒸馏水为浸提剂获得桃树根系浸提液,研究其不同浓度对毛桃幼苗生长的化感效应。结果表明,根系浸提液对叶面积、叶长、叶宽、周长、叶长/叶宽、株高、干周、最大根长、地上鲜重和地上干重表现为低浓度促进,高浓度抑制的质量浓度效应。浓度高于1:20(根粉与水的质量比)时,随着浓度的增加,抑制作用增强。对地下鲜重和地下干重表现为抑制作用,浓度越大,抑制作用越明显。对比叶重而言,1:5的处理在试验结束时处于最高水平。高浓度桃树根系浸提液对毛桃幼苗生长具有自毒作用,从而导致植株生长缓慢,生长发育受阻。

In order to study the self-allelopathy and the mechanism of continuous cropping obstacle, using distilled water as extracting agent, allelopathic effect of extracts in different concentrations of peach tree roots on growth of Maotao seedlings （Prunus persica L. Batsch） was studied. The results showed that leaf area, length, width, circumference, length/width ratio, height, trunk girth, maximum root length, shoot fresh and dry weight were promoted in lower concentration and inhibited in higher concentration. The inhibition was gradually strengthened with increasing concentrations when extracts concentrations were higher than 1：20 （mass proportion between root and water）. However, the inhibition on root fresh and dry weight gradually increased with increasing concentrations. The treatment with specific leaf weight of 1：5 was higher than other treatments by the end of the experiment. Self-allelopathy was obvious when Maotao seedlings were irrigated with high-concentration extracts which led to retarded growth rate and disturbance of growth.