香樟根际土壤化感作用的初步研究

Allelopathy of rhizosphere soil of Cinnamomum camphora(L.) Presl

化感作用是农林复合生态系统中作物相互作用的重要方式,它有十分重要的经济、生态意义。该研究采用常规水浸提方法制备不同浓度的香樟(Cinnamomum camphora(L.)Presl.)根际土壤水浸提液,用生物测定法测定其对萝卜(Raphanus sativus L.)、红苋菜(Amaranthus mangosfanus L.)和荠菜(Capsella bursa-pastoris(L.)Medic.)的种子萌发和幼苗生长的化感作用。结果表明,浸提液浓度不同,其化感效应不同,受体植物不同,化感效应差别也较大,具体表现为,浓度较低时,化感作用较小,对萝卜根生长起促进作用,随着溶液浓度的增大化感抑制作用逐渐增强,大致表现出低促高抑的规律;萝卜受化感作用抑制作用较其他两种蔬菜小。通过研究可得出结论:香樟对蔬菜有较强的化感作用,香樟林地发展林-菜复合种植一定要选择合适的蔬菜种类和科学的管理措施。

Allelopathy is an important Interaction of crops in agroforestry ecosystem. In the paper, the allelopathy of rhizosphere soil of Cinnamomum camphora （L.） Presl extracts on three plant acceptors （Raphanus sativus L., Amaranthus mangosfanus L. and Capsella bursa-pastoris （L.） Medic.） was explored by germination and growth experiments. Results showed that different concentration of aqueous extracts from rhizosphere soil of Cinnamomum camphora （L.） Presl had certain allelopathy on those acceptors, and the allelopathy enhances with the increase in concentration. From the result, It could be concluded that the aqueous extracts of rhizosphere soil of Cinnamomum camphora（L.） Presl had certain inhibitory effects on those acceptors, but under low concentration treatment, some results were reverse.