柽柳水浸提液对猪毛菜种子萌发和幼苗生长的化感作用

Allelopathy of Aqueous Extracts from Tamarix spp. on Seed Germination and Seedling Growth of Salsola collina Pall.

以一年生草本植物猪毛菜的种子和幼苗为受体,采用室内培养皿法,研究塔里木河下游柽柳水浸提液对猪毛菜种子及幼苗的化感作用。结果表明:(1)柽柳茎、根浸提液对猪毛菜种子萌发的抑制作用较为显著;柽柳茎浸提液0.08～0.20g/mL浓度处理组的猪毛菜种子发芽率、发芽指数和活力指数与对照组之间均差异显著,其中种子发芽率分别减少了84.78%、89.12%、76.09%和67.39%;柽柳根浸提液对猪毛菜种子活力指数的化感作用较为显著,0.12g/mL和0.16g/mL浓度处理组与对照组相比差异极显著,化感效应指数分别为-0.960和-0.930。(2)柽柳茎浸提液处理中的猪毛菜幼苗苗长和根浸提液处理中的猪毛菜幼苗鲜重与对照组差异显著,两者在0.08g/mL浓度处理下分别增加了61.49%和52.63%;在其他浓度处理下则主要受抑制作用。(3)柽柳叶浸提液的综合化感效应呈现"W"型变化趋势;茎浸提液在高浓度时具有较强的综合化感效应;根浸提液的综合化感效应在0.12g/mL浓度最强(RI=-0.749),在0.08g/mL浓度时最弱(RI=-0.389)。

The aqueous extracts of Tamarix spp.were prepared by three plant tissue collected in the Lower Reaches of Tarim River,and Salsola collina Pall.,one kind of the local perennial herb,was taken as the test plant.The indoor petri dish method was utilized to analyze the allelopathy of Tamarix spp.aqueous extracts on the seed germination and seedling growth of Salsola collina Pall.The result show that：（1）The Tamarix spp.extracts of stem and root both significantly restricted the seed germination of S.collina.The differences of germination rate,germination index,and vitality index of S.collina all reach the significant level in between the stem treatment groups of 0.08～0.20 g/mL and control group.The germination rate decreases by 84.78%,89.12%,76.09%,and 67.39%,respectively.The allelopathy of toot extracts on the seed vitality index of S.collina is more significant.Extreme significance exists between the treatment groups of 0.12 g/mL or 0.16 g/mL and the control group with the response indexes of-0.960 and-0.930.（2）The stem and root extracts of Tamarix spp.presented significant allelopathy on the seedling length and fresh weight of S.collina,respectively.The seedling length and fresh weight both increased by 61.49% and 52.63%,respectively,in the treatment groups of 0.08 g/mL.The extracts of other concentrations all have the restricted impacts.（3）The comprehensive allelopathy of leaf extracts of Tamarix spp.presents the trend of W,the stem extracts have stronger comprehensive allelopathy in higher concentrations,the root extracts have the strongest comprehensive allelopathy in the concentration of 0.12 g/mL（RI=-0.749） and the weakest in the concentration of 0.08 g/mL（RI=-0.389）.