| This subject came from “National Natural Science fund(30871444)”,“Anhui Natural Science fund(11040606M71)”“The key project of Anhui education department(KJ2008A139)”,strived to analyze the structural traits of arthropod community in “Huang shan da ye”(Huang shan zao ya)tea garden in hefei and enrich the theoretical foundation for IPM of pests.1.The arthropod community was divided into three sub-communities : phytophages,predators,parasitorids– neutralityies.according to nutrition and feeding relationship.In 2013,the results showed a total of 84 species,belonging to 55 families;phytophagous subcommunity occupies the main part,the relative abundance was 51.58%.The main dominant species were Empoasca vitis,Toxoptera aurantii and Galerucinae;predacious subcommunity relative abundance was 33.67%.The main dominant species of natural enemies were Theridion octomaculatum,Tetragnatha squamata and Tetragnatha maxillosa.In 2014,the results showed a total of 88 species,belonging to 58 families;phytophagous subcommunity occupies the main part,the relative abundance was 39.19%.The main dominant species were Empoasca vitis,To Galerucinae and Frankliniella intonsa;predacious subcommunity relative abundance was 38.31%.The main dominant species of natural enemies were Tetragnatha maxillosa,Theridion octomaculatum and Tetragnatha squamata.2.Community parameters of arthropod community were analyzed by t-test between 2013 and 2014,the results showed no significant differences.The population numbers were also compared,the pests which had significant difference were Galerucinae(4.0179)and Breuipalpus oboyats(3.0056);the pests which had extremely significant difference were Stephanitis chinensis(2.3601)and Ricaniaspeculum(2.0912);their natural enemies,Erigonidium graminicolum and Clubiona deletrix were up to significance level,Xysticus ephippiafus,Clubiona japonicola,Plexippus paykulli and Tetragnatha maxillosa were up to extremely significance level.3.In 2013,the comparison of total community diversity index showed total community> predacious > phytophagous> parastitoids-neutralities sub-community;In 2014,the comparison of total community diversity index showed total community> predacious > phytophagous> parastitoids-neutralities sub-community.Thus it can be seen that diversity index had the same varying trend.4.In 2013,the principal component analysis(PCA)were used to compare total community and sub-community.In total community,phytophagous and predacious sub-community,the results indicated that the contribution of second principal component were 89.0044%,94.1273% and 92.3505% respectively.In 2014,the contribution of second principal component was 94.2092%,89.5152% and 92.4531% respectively.5.The relationship between diversity indexes and other indexs in every community were analyzed by Path analysis in tea garden in 2013 and 2014.It were positive correlation between the evenness and diversity index.In 2013,the total community diversity index(H')was negatively correlated with dominance.In 2014,the total community diversity index was negatively correlated with dominant concentration,individual number,species richness and dominance.6.The structural traits of every community in tea garden were analyzed by fuzzy Clustering analysis in two years.In 2013,the results showed that the total community was divided into 4 clusters when D was 0.9500;the phytophagous community was divided into 4 clusters when D was 0.9600;the predacious was divided into 5 clusters when D was 0.9400.And in 2014,the results showed that the total community was divided into 3 clusters when D was 0.9400;the phytophagous community was divided into 4 clusters when D was 0.9200;the predacious was divided into 3 clusters when D was 0.9400.7.The arthropod total community,phytophagous and predacious sub-community in tea garden were analyzed by the optimization partitions method.In 2013,the results showed that the arthropod total community,phytophagous,predacious,parastitoids-neutralities could be divided into 7,6,4and 10 stages and the error function could be divided into 1.0824,2.3691,2.1906 and 0.6947 respectively.In 2014,the results showed that the could be divided into 6,5,4 and 11 stages and the error function could be divided into1.5933,2.8107,1.7922 and0.4028 respectively.8.The quantity,and the temporal and spatial relationships of the four pests and their predators were analysed using grey correlation degree and ecological niche analyses in 2013 year.Then,the dominant natural predator of each pest was evaluated using the sum of close index.In spring-summer season,the results show that there were greater differences for dominant natural predators of four pests between in spring-summer season and Autumn-winter season.The three dominant natural predators of Empoasca vitis were Oxyopes sertatus,Neoscona theisi and Tetragnatha maxillosa;the dominant natural predators of Toxoptera aurantii were Leis axyridis,Propylea japonica and Tetragnatha maxillosa;for Galerucinae,the main natural predators were Propylea japonica,Leis axyridis and Erigonidium graminicolum;and for Ricaniaspeculum,the predators were Clubiona japonicola,Tetragnatha maxillosa and Xysticus ephippiafus.In Autumn-winter season,the three dominant natural predators of Empoasca vitis were Tetragnatha maxillosa,Theridion octomaculatum and Tetragnatha squamata;the three dominant natural predators of Toxoptera aurantii were Tetragnatha maxillosa,Theridion octomaculatum and Tetragnatha squamata;for Galerucinae,the main natural predators were Propylea japonica,Leis axyridis and Tetragnatha maxillosa;and for Ricaniaspeculum,the predators were Neoscona theisi,Oxyopes sertatus and Xysticus ephippiafus.9.The quantity,and the temporal and spatial relationships of the four pests and their predators were analysed using grey correlation degree and ecological niche analyses in 2014 year.Then,the dominant natural predator of each pest was evaluated using the sum of close index.In spring-summer season,The three dominant natural predators of Empoasca vitis were Tetragnatha maxillosa,Erigonidium graminicolum and Tetragnatha squamata;the dominant natural predators of Toxoptera aurantii were Tetragnatha maxillosa,Theridion octomaculatum and Tetragnatha squamata;for Galerucinae,the main natural predators were Theridion octomaculatum,Clubiona japonicola and Oxyopes sertatus.In Autumn-winter season,the three dominant natural predators of Empoasca vitis were Erigonidium graminicolum,Neoscona theisi and Leis axyridis;the three dominant natural predators of Toxoptera aurantii were Tetragnatha maxillosa,Leis axyridis and Clubiona japonicola;for Galerucinae,the main natural predators were Neoscona theisi,Erigonidium graminicolum and Leis axyridis. |
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