重迎茬大豆根际土壤有机化合物的初步鉴定及对大豆种子萌发的化感作用

Primary identification of organic compounds in soybean rhizospheric soil on continuous and alternate cropping and their allelopathy on soybean seed germination.

采用气相色谱 质谱联用技术 (GC MS)鉴定了用无水乙醇浸提的结荚期重迎茬大豆根际土壤有机化合物 ,并对其化感作用进行了初步研究 .结果表明 ,重迎茬大豆根际土壤中主要含有有机酸类、酯类、醇类、酮类、醛类、苯类、酚类、烃类及萘、呋喃类等有机化合物 ;其中包含很多曾被报道过的化感物质 .在本试验的根际土壤用量条件下 ,其醇提液对大豆种子萌发及胚根生长未表现出化感作用 ,这可能与其致害浓度有关 .此外 ,本文还探讨了化感作用与大豆重迎茬障碍的有关问题 .

Organic compounds extracted with ethanol (OCEWE) from soybean rhizospheic soil on continuous and alternate cropping at pod string were identified by gas chromatography mass spectrometry (GC MS). The results showed the compounds mainly include organic acids, alcohol, acetone, aldehyde, naphthalene phenyl and furan hydrocarbon,many of which were reported as allelochemcals.Under this experiment condition,OCEWE did not show any allelopathy on soybean seed germination and radicle growth,which might be related with their critical toxicity concentrations.In addition,the relationship between allelopathy and barrier on soybean continuous and alternate cropping was also discussed.