Studies On The Dynamics Of Arthropod Communities In Wu Niu Zao Tea Garden Of Hefei

The thesis were parts of Anhui Natural Science fundation(11040606M71),The key project of Anhui education department(KJ2008A139)and Special research of national forestry public welfare industry(201404410),strived to analysis the survey data of arthropod community in Wuniuzao tea gardens of Hefei,and enrich the theoretical foundation for IPM of pests.1.The arthropod community was divided into three sub-communities : phytophages,predators,parasitorids– neutralityies on the basis of the theory of food webs.In 2015,the survey data showed a total of 78 species,and belonging to 53 families;phytophagous sub-community occupies the principal part,the relative abundance was 53.88%,Frankliniella intonsa,Empoasca vitis,Monolepta hieroglyphic,Galerucinaea and Toxoptera aurantii were the major pests;the predacious sub-community of relative abundance was 31.24%,the main predators were Tetragnatha squamata,Tetragnatha maxillosa,Oxyopes sertatus,Neoscona theisi and Theridion octomaculatum.In 2016,the survey data showed tea plantation arthropod community contained 85 species.The relative abundance of predacious sub-community was 0.3140.The relative abundance of phytophagous sub-community was 0.4579.The relative abundance of parasitorids–neutralityies sub-community was 0.2281.2.Community parameters of arthropod community were analyzed between year of 2015 and 2016 by t-test,consequently the difference of the evenness index J was significant,and the other were not significant.The individual of numbers were compared,the notably different of pests were Monolepta hieroglyphic(2.3985);their natural enemies,Clubiona deletrix(7.6611)were up to extremely significance level,Tetragnatha squamata(2.6214)and Plexippus paykulli(2.3466)were up to significance level.3.In 2015,the comparison of total community and sub-communities diversity index all showed total community> predacious > phytophagous> parastitoids-neutralities sub-community,and the result of 2016 was similar to 2015.Thus it showed that diversity index had the same varying trend.4.In 2015,the principal component analysis(PCA)were used to compare total community and sub-community in“Wu Niu zao”tea garden.In total community,phytophagous,predacious and Parasitoids-Neutralities sub-community,the results indicated that the contribution of second principal component were 96.7902%?92.6676%? 88.1796% and 85.0368% in“Wu Niu zao”tea garden.In 2016,the contribution of second principal component was 87.5694%?86.4333% ?89.4054% and 90.3822% in“Wu Niu zao”tea garden.5.The relationship between diversity indexes and other indexes in total community and sub-communities were analyzed by Path analysis in “Wu Niu zao”tea garden in 2015 and 2016,the evenness and species had positive correlation with diversity index.The comprehensive effect of the six ecological indexes on the diversity index was evaluated by using the absolute value of the decision coefficient.The results showed that the diversity of the neutral-parasitic sub-community in 2015 had the greatest effect on the diversity index,and the other total communities and sub-communities of the evenness had the greatest effect on the diversity index.6.The characteristic parameters of total community and its sub-community were analyzed with fuzzy Clustering analysis.In 2015,the results showed that the total community was divided into 3 classes when D was 0.97;in 2016 was divided into 3 classes when D was 0.94.In 2015,the results showed that the predacious sub-community was divided into 3 classes when D was 0.94;in 2016 was divided into 3 classes when D was 0.94.In 2015,the results showed that the phytophagous sub-community was divided into 3 classes when D was 0.95;in 2016 was divided into 4classes when D was 0.92.7.The optimization partitions method was applied to analyze the characteristic parameters of total community and its sub-community.In 2015,the results showed that the total community,predacious,phytophagous sub-community could be divided into 4,5,6 stages and the error function were 1.3881,1.6875 and 1.3289 respectively.In 2016,the total community,predacious,phytophagous,parastitoids-neutralities sub-community could be divided into 5,6,and 6 stages and the error function were 1.8717,1.6152,and 2.1591 respectively.8.To evaluate and contrast the dominant species of natural enemies,in the present work,the quantity as well as temporal and spatial of four kinds of pests and their natural enemies in “Wu Niu zao”tea garden were systematically studied using grey system analysis,ecological niche analysis.In 2015,the three dominant natural predators of Toxoptera aurantii were Tetragnatha maxillosa,Tetragnatha squamata and Theridion octomaculatum;the dominant natural predators of Empoasca vitis were Oxyopes sertatus,Tetragnatha maxillosa and Misumenops tricuspidatus;for Monolepta hieroglyphic,the main natural predators were Tetragnatha maxillosa,Neoscona theisi and Erigonidium graminicolum;and for Galerucinae,the predators were Neoscona theisi,Tetragnatha maxillosa and Tetragnatha squamata.In 2016,The three dominant natural predators of Toxoptera aurantii were Misumenops tricuspidatus,Neoscona theisi and Theridion octomaculatum;the dominant natural predators of Empoasca vitis were Oxyopes sertatus,Tetragnatha maxillosa and Erigonidium graminicolum;for Monolepta hieroglyphic,the main natural predators were Erigonidium graminicolum,Tetragnatha squamata,and Leis axyridis;and for Galerucinae,the predators were Leis axyridis,Misumenops tricuspidatus and Neoscona theisi.9.Investigations on the spatial construction and distribution of Empoasca vitis and Frankliniella intonsa with their natural enemies in peak period were conducted with geostatisticed.The result show that the semivariogram of Empoasca vitis and Frankliniella intonsa were described by spherical model,showing an aggregated distribution,the ranges of spatial dependence were 6.6824 m and 8.5703 m,respectively.The main natural enemies of Empoasca vitis and Frankliniella intonsa also were described by spherical model.The dominant natural enemies of Empoasca vitis on the spatial distribution were Tetragnatha maxillosa and Oxyopes sertatus,and for Frankliniella intonsa,the predators were Tetragnatha squamata and Theridion octomaculatum.