Ecology Of Spider Community In Rice Field

Ecology of Spider Community in Rice FieldPh. D. Candidate:Li JianquanSupervisor:Prof. Zhao ZhimoN4ajor:Agricultural Entomology & Insect Pest ControlField:Insect EcologySUMMARYBased on the interaction system of rice, insect pest and spider, the structure and function of arthropod community was studied. The law of spider community reestablishment construct was probed. The spatial pattern of spider and the spatial relation between spider and plant hopper and leafhopper, were analyzed. The effects of different agricultural measures on the community were compared. And the mechanism of controlling the function of spider to insect pest in rice field in Chongqing City, is revealed in this paper, by using the field test, indoor trial, outdoor experiment and field investigation, and the knowledge and technique of biology, ecology, taxonomy, geo-statistics, systematic and computer etc. The results are summarized below.I The structure and dynamics of the arthropod community was investigated, grouped, classified and analyzed. 101 families, 269 species of animal in rice field; 21 families, 203 species of spider in farmland and 16 families, 46 genus, 89 species spider of in rice field were discovered in Beibei, Wanzhou, Bishan, Hechuan and Yongchuan etc. five counties of Chongqing City. 16 families, 39 genus and 73 species of spider were investigated in Beibei county, which dominant species were main Pirata subpiraticus(Boes. et stri. Ummerliata insecticepsljBoes. et sIr.). Erigonidium graminico/a(Sundeva1l)~ ClubionajaponicolaQioes. et str.) and Theridion octomaculatu叫Boes．et sir)． 2 y sub－communities and 6山notional groupi3 ofanlmal community were divided dCCOYdlflg to fllltfltlolldl fCldtlOD OIthC plffi81 COffiffitifllty lfl flCC iCld．工"hC fCIfltIVC abundance ofthe4 sub－conlmunltles was res］,ectlvely 58．83％predatorX 35,59％ phytophagous,5．Ig％neutral and 0．39％parasite． The height ofabundance of6 functional groupwere In turn spider＞Insect pests＞nutrlal Insect＞other animal pest＞predato］,y Insect＞parasite Insect．乞 The altitude dlsQ口butlon otsplderdlstingulf；hed Indifferent area．34 spedes In巴1＊w功ot＊e(240叫md忙叩＊c。es In hsh am山休＊盯e。＊＊既n驴比d,口。卜l巾山l relative劝ndnce was 58．34％In low altitudel)ut sl．84％in igh altitude． The donunant concentfatlon ofanlmal commtmlty In different rice growing season ws In tUrn illenng stage(0．13713)＞Jointing stage(0．09105)＞earing stage (0．06610Pmstllre Penod(0．05823)．he dominant concentration height of sub－ community In nce growing season was parasited neu地卜 phytophagous＞predatory； Thedomlnantconcelrlratlonhelghtof凡mctlonal group In rice growing season was other animal pest＞predatory Insecp parasite Insect＞ Insect pesp砒以mllnsect＞ spider． ThedomlnantsPecles ofanlmal colTln,－unlty In different nce growing season was d江Rrent．工上e main dominant spedes ofanlmd communltt In rice growlnt season were 尸尔mb 皿勿尔日nt。,U加me以冰何uirecl厂岑拈,一ce——Pld(Thr uo门汇Ue N尬！H一几Er格pninil,,llgrQmjnjco切,andbrownPlathOPPer(冲W删阳h以gens (Sta)),of wich he eological doAnnance was respectively 0．11 28,0．1073,0,1070, 0．1039 nd 0．0806．he main dominant spedes was Ermpn枕urn gramlnlco切 In0 tlllerlnt statae,rlcetllflPldlnjolntlnj state,brownPlantMPtr In earlnt state and j'I厂么豆m SlloDI厂J0＊"！nn巳扯life Stavc． 3 回h relation ofstructure and dynamic among spedes pool,exchange pool and subject community In community reestablishment was probed by the theory of island biogeograPhy and reservoir sources hyPOthesis ofconunumty reestablishment, Which takes 6 spider as the object In Nongyun village,Xlema townstUp(altitude 240m)...