Study On Soil Fungi Diversity In Greenhouse In Hebei

Due to years of cultivation,soil-borne diseases and air-borne ones were increasing in the greenhouses year and year.especially soil-borne disease,because their pathogens survived in the soil over a long period,when the conditions are appropriate,plant disease were incured and plant production decreased.Therefore,it aimed at the study on the diversity of soil fungi in Hebei greenhouse,which not only prevent and control soil-borne diseases,guide scientific vegetable production,but also rich China's fungal species resources.Soil fungus,which collected from rhizosphere soil in the greenhouses planted vegetables in Hebei Province were separated and identified in this thesis.165 soli samples were collected by five-point sampling,fungus were diluted separation and identified.the following findings were made:1.22 genus and 61 species were identified.which are Phytophthora infestans,Humicila grisea,Humicolafuscoatra,Mucor hiemalis,Actinomucor elegans,Muorplumbeus,Chaetomium olivaceum,Chaetomium cochliodes,Chaetomium globosum,Myrothecium roridum,Acremonium strictum,Acremonium furcatum,Stysanus stemonites,Collelotrichum,Torula antennata,Alternaria alternata,Syncephalastrum racemosum,Gliocadium roseum,Botryotrichum piluliferum,Myceliophthora thermophila,Chrysoporium keratinophilum,Mortierella exigua,Vertillium lecanii,Tolypocladium niveum,Penicillum montanense,Penicillum frequentans,Penicillum.expansum,Penicillum citreonigrum,Penicillum expansum,Penicillum claxiforme,Penicillum caseicolum,Fusarium nivale,Fusarium solani,Fusarium ventricosum,Fusarium aquaeductuum var.medium,Fusarium poae,Fusarium semitectum,Fusarium stilboides,Fusarium moniliforme,Fusarium oxysporum,Fusarium equiseti,Fusarium flocciferum,Trichoderma pseudokoningii,Trichoderma citrinoviride,Trichoderma atroviride,Trichoderma longibrachiatum,Trichoderma koningii,Trichoderma harzianum,Trichoderma minutisporum,Trichoderma crasssum,Trichoderma virens,Aspergillusflavus,Aspergillus fumigatu,Aspergillus fumigatus var.fumigatus,Aspergillus niger,Aspergillus sulphureusr,Aspergillus tubingensis,Aspergillus versicolor,Aspergillus ustus,Aspergillus ochraceus,Aspergillus restrictus,Stachybotrys microspora and one unknowned species.2.At the same time,the antagonism and biocontrol mechanism of Trichoderma spp.to the important pathogens happened on vegetables and corns,including F.oxysprorium,E.turcicum and C.lunata etc.were tested.T.harzianum and T.virens which have a good effect on F.oxysprorium were screened and a T.harzianum on E.turcicum were screened,respectively.And its main antagonistic mechanism to pathogens is competition, re-parasitic and antibiotic,in that re-parasitic is one of the most important mechanism.Not only the results in the thsis can provide basic theoretical basis for understanding of protection for vegetable soil fungi diversity,but also for exploring the development and changes of strains and plant diseases prevention and treatment guidance.