核桃青皮分解对小白菜生长及生理特性的影响

Effect of Decomposing Walnut Green Husk on Growth and Physiological Characteristics of Brassica rapaL.var. chinensis Seedling

采用盆栽试验,研究了不同剂量核桃(Juglans regia L.)青皮在土壤中分解过程中对受体植物小白菜(Brassica rapa L.var.chinensis)幼苗生长及其生理特性的影响,探讨核桃青皮的化感作用机理。结果表明:(1)核桃青皮在施入土壤的75d内,显著抑制了小白菜地上部分生物量的积累。(2)各剂量青皮处理小白菜叶片的叶绿素含量在施入20d时均较CK降低,且随着处理时间延长总体呈减少趋势。(3)各剂量青皮处理小白菜叶片超氧化物歧化酶(SOD)、过氧化物酶(POD)活性在施入20d和75d时大多比对照显著升高,且有随剂量增加而增强的趋势,但过氧化氢酶(CAT)活性则随添加量增大或处理时间延长多无显著变化。(4)小白菜叶片可溶性糖(SS)含量在施入20d时随青皮添加量的增加而增加,后期则表现为显著下降,而可溶性蛋白(SP)和脯氨酸(Pro)含量在整个处理期则呈减少趋势。研究认为,核桃青皮在土壤中分解可能对小白菜的生长和抗性生理指标产生了明显的化感作用,其化感作用强度随其分解时间延长呈先强后弱的变化趋势,且高添加量产生的效应比低添加量快而且强。

A pot experiment was conducted to study the ef{ects of the decomposing wainutCYugEans regza L. ） green husk on the growth of Brassica rapa L. var. chinensis seedling group. The results showed as fol- lows： （1）The aboveground fresh weight of B. rapa L. var. chinensis seedling was inhibited significantly by each treatment at 20 d,45 d and 75 d after sowing; （2）The chlorophyll content of B. rapa L. vat. chinensis seedling was significantly lower than that in CK at 20 d. As the time extended, the chlorophyll content of B. rapa L. var. chinensis showed a trend of decrease; （3）The activities of superoxide dismutase（SOD） and peroxidase（POD） increased during the observation period,but catalase（CAT） activity did not showed the significant change in 70 d; （4）The contents of soluble protein（SP） and proline（Pro） reduced with the increasing addition of walnut green husk,while the soluble sugar（SS） content was significantly lower than that of CK at 45 d and 75 d. Generally,the allelopathic intensity of walnut green husk on B. rapa L. var. chinensis seedling was strong at early time, but got weaker with prolonged time,and comparatively, high doses of green husk generated allelopathic effects earlier and stronger.