Physiological responses of four crops in aqueous extracts of soil from Eucalyptus urophylla × Eucalyptus grandis forests
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摘要: 用尾巨桉Eucalyptus urophylla E. grandis纯林土壤水浸提液处理菜心Brassica parachinensis，早熟白菜Brassica pekinensis，水稻Oryza sativa和萝卜Raphanus sativus幼苗，研究浸提液对这4种作物的化感作用。结果表明：浸提液对菜心、早熟白菜、水稻和萝卜叶绿素质量分数、脯氨酸质量分数、可溶性糖质量分数均有显著影响。随着浸提液浓度的升高，受体植物叶片的叶绿素质量分数均降低；脯氨酸质量分数呈现先升高后降低的趋势；菜心、早熟白菜、萝卜可溶性糖质量分数也是呈下降趋势，而水稻的可溶性糖质量分数却先升高后降低。根据所测定指标综合判断，水稻对尾巨桉纯林土壤水浸提液中化感物质的抗性比其他3种作物强。这说明尾巨桉纯林土壤中存在某些化感物质，因受体植物种类不同其化感效应有所差别。表3参23Abstract: The allelopathic effect of Eucalyptus urophylla Eucalyptus grandis forest soil on the content of chlorophyll，proline，and soluble sugar was tested by treating growth medium of four crops：Brassica parachinensis（false pakchoi），Brassica pekinensis（Peking cabbage），Oryza sativa（rice），and Raphanus sativus（radish）with aqueous extracts of the soil. Results showed highly significant differences（P＜0.01）on content of chlorophyll，proline，and soluble sugar for the four crop plants. With an increase in aqueous extract concentration，chlorophyll content in receptor plant leaves decreased. Also，proline content rose first and then decreased as did soluble sugar of rice. Soluble sugar content from the four crop plants also declined. Thus， allelochemical resistance of rice was stronger than the other crops，and it was certain that there were some allelochemicals in the soil that caused different effects on the four species.［Ch，3 tab. 23 ref.］
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https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2011.05.024
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