作　　者： ; ; ; ; ;

机构地区： 韩山师范学院生物系

出　　处： 《生态学杂志》 2009年第5期833-838,共6页

摘　　要： 室内条件下测定了当归根际土水浸液对当归种子萌发、幼苗生长的影响,采用化感作用效应指数(RI)和综合化感效应指数(M)及差异性检验评价了当归根际土的化感效应。结果表明:与蒸馏水和对照土实验组相比,根际土、非根际土水浸液对种子萌发、幼苗生长及4种酶活性均有显著的抑制作用;随着质量浓度的升高,根际土水浸液对当归种子萌发和幼苗生长的综合化感效应在各浓度(0.125～1.000g·ml-1)之间差异显著(P<0.05),而在相同质量浓度条件下,根际土水浸液的综合化感效应较非根际土和对照土明显;当质量浓度均为0.500g·ml-1时,根际土、非根际土水浸液对4种酶活性均有明显抑制作用,且二者之间的差异达到显著水平(P<0.05);3种土壤水浸液供体对当归种子萌发、幼苗生长的抑制强度均表现为根际土>非根际土>对照土,因此推测自毒作用是当归连作障碍的原因之一。 To investigate the autotoxicity of continuous cropping obstacle of Angelica sinensis, the allelopathic effects of the aqueous extract of A. sinensis rhizosphere soil on A. sinensis seed germination, seedling growth, and physiological indices were determined by applying allelopathic effect index （RI）, integrated allelopathic effect index （M）, and variance analysis. It was shown that the aqueous extracts of A. sinensis rhizosphere and nonrhizosphere soils had significant inhibitory effects on the seed germination, seedling growth, and enzyme activities of A. sinensis, compared with distilled water and unplanted soil aqueous extract. The integrated allelopathic effects of A. sinensis rhizosphere soil extract increased with its increasing mass concentration, and had significant differences （P 〈0.05） between various mass concentrations （0. 125-1. 000 g · ml^-1 ）. At the same mass concentrations, the effects of rhizosphere soil extract were more distinct than those of nonrhizosphere soil extract. The rhizosphere and nonrhizospbere soil extracts at the mass concentration of 0. 500 g · ml^-1 inhibited the SOD, POD, CAT and NR activities of A. sinensis seedlings significantly, and there was a significant difference （P 〈 0. 05 ） in the inhibitory effects between the two soil extracts. The inhibitory effect of the aqueous extracts of rhizosphere-, nonrhizosphere- and unplanted soils on the seed germination, seedling growth, and enzymatic activities of A. sinensis was in the order of rhizosphere soil 〉 nonrhizosphere soil 〉 unplanted soil, indicating that autotoxicity could be one of the reasons of continuous cropping obstacle of A. sinensis.

关 键 词： 当归 根际土 连作障碍 化感效应 抗氧化酶

领　　域： [生物学]