重迎茬大豆根区土壤有机化合物的GCM/S分析

Analysis of Organic Compounds in Continuous and Alternate Cropping Soils around Rhizosphere of Soybean by GC-MC

采用GC M/S分析法,鉴定了重迎茬大豆成熟期根区土壤有机化合物。结果表明,在重迎茬土壤中存在有机酸、醇、酯、酮、醛、苯、酚和烃类等有机化合物,其中很多被报道是化感物质,重茬化感物质种类远多于迎茬。重迎茬土壤中的化感物质种类多与大豆根系分泌物、根茬腐解产物、地上部水浸物中的化感物质相同。

Organic compounds in continuous and alternate cropping soils around rhizosphere of soybean collected at the maturing stage were identified by GC-MS method. The results showed that the continuous and alternate cropping soils contained organic acids, alcohol, ester, ketone, aldehyde, benzene, phenol, hydrocarbon, etc. Many of these were reported as allelopathic compounds. More allelochemicals were found in continuous cropping soil than those in alternate cropping. Most alleloehemieals in continuous and alternate cropping soils are the same as those in the root exudates, decomposed root stubs and aqueous extracts from plant shoots of soybean.