不同黄瓜品种根系分泌物对根际土壤微生物及土壤养分的影响

研究以对枯萎病抗性不同华北生态型密刺类黄瓜品种秋棚、津研4号、中农13号、津优3号为试验材料,采用基质培的方式通过浸根法获得足量的由植物根系主动溢泌、可溶的根系分泌物提取液;采用仪器分析的方法系统研究不同品种间该类根系分泌物组分的差异.通过试验数据和图表的分析结果表明:黄瓜根系分泌物对于抗病黄瓜品种根区土壤中的真菌数量有促进作用,黄瓜植株的根系分泌物对黄瓜根区土壤的尖孢镰刀菌的增加具有明显的促进作用,且感病品种的促进作用强于抗病品种;不同抗性黄瓜的根系分泌物,对根区土壤的细菌的增加具有抑制作用,感病黄瓜品种的土壤中的放线菌的数量明显高于抗病品种;黄瓜根系分泌物对根区土壤中放线菌的影响,整体规律性不明显;黄瓜根系分泌物的存在提高了土壤三大营养元素的利用效率,同时提高了氮、磷、钾的速效比率.

Influence of Different Cucumber Varieties' Root Exudates on the Rhizosphere Soil Microorganisms and Soil Nutrient

This research took Qiu-peng,Jin-yan the 4th,Zhong-nong the 13th and Jin-you the 3rd as experiment materials.Adopted substrate culture through root-soaking method to acquire quantity of root exudates extract which from plant root fasten active overflow Bi and could dissolve;The experiment used Instrumental Method to research the difference among root exudates of different species of cucumber.Analyzed experimental data and chart to get experimental result:root exudates of resistant variety cucumbers stimulate to increased the quantity of soil fungi in cucumber root area,root exudates of cucumbers had obvious promotion impact to the fusariumoxysporum in cucumber root area,and the promotion of susceptible variety was stronger than resistant variety's.Root exudates of different resistance varieties have inhibition impact to the increasing of the number of actinomycetes in root area,the number of actinomycetes in susceptible varieties was obvious more than resistant varieties',the influence of root exudates of cucumber on actinomycetes was not obvious.The existence of the cucumbers'root exudates promote the use efficiency of the three kinds of nutrient elements,and it promote the use efficiency of N,P,K.