Effect Of Habitat Type On Arthropod Diversity In Typical County Farmland Landscape Of Lower Liaohe Plain

Biodiversity in agricultural landscape is beneficial to keep farmland landscape stable and develope sustainable agriculture.The change of habitate can impact arthropod community composition consumingly in agriculture landscape.Arthropod community reflect degree of biological diversity.Agricultural landscape structure and arthropod community composition are affected by human activities.One reason of the number of arthropods decrease is using chemical fertilizers and pesticides.Researching the distribution characteristics to increase arthropods diversity by change landscape composing in farmland landscape.We researched the number of arthropods and dominant species connection among the non-agricultural habitats,farmland margins and farmland interior in the field scale.Our research area was ChangTu country.We set up 480 traps in 40 farmland landscape quadrats from 20 grids to collect arthropods from non-agricultural habitats,farmland margins and farmland interior and ascertained arthropods community compositions.We researched the gradient trend of the arthropods number with ANOVA.The rate of arthropods change indicates the extent to the number of arthropods change in farmland landscape.The arthropods distribution characteristics was analyzed by diversity index,dominance index and evenness index in farmland landscape.The correlation of community characteristic was researched by arthropod community charicteristic exponent from different habitats.The results are shown below.:(1)The results showed that we collected 29622 arthropods,which contain 1 door,5 classes,14 orders and 47 families.The composition of arthropod community differences were less from farmland landscape which take important part ditch,forest and planted forest.Arthropods in non-agricultural habitats,in edges of cropland and farmland internal arthropods community compositions were similarity.The extent of arthropods community characteristic index change was small.The composition of arthropod community was variant from different season.The dominance groups of arthropods were carabidae and formicidae.The frequent groups of arthropods were change with season.The arthropods community characteristic index were change with season from farmland landscape which take important part ditch,forest and planted forest.(2)The number of arthropods showed decreasing progressively gradients in non-agricultural habitats,farmland margins and farmland interior(p<0.05).The rate of arthropods change from non-agricultural habitat to edges of farmland was 0.37,0.18,The rate of arthropods change from edges of farmland to farmland internal was 0.64,0.96.The arthropods quantity changes was higher from non-agricultural habitat to farmland-forest edge.In forest the extent to change of arthropod population was 0.1 and 0.14 that was the smallest from the non-agricultural habitats to the edge of farmland.(3)The number of arthropods were variant in different habitat types and farmland landscape.Carabidae and formicidae were the most important arthropod in farmland landscape.There were 10909 carabidaes and 8210 formicidaes in farmland landscape.The carabidae predominance degree was higher in ditch farmland habitat.There were 100 and 123 carabidae in every ditch sampling site from summer and autumn,which were 41.9%,56.7% of all arthropods.The formicidae predominance degree was higher in forest farmland habitat.There were 79 and 84 formicidae in every forest sampling site from summer and autumn,which were 41.9%,56.7% of all arthropods.The number of carabidae and formicidae showed decreasing progressively gradients in non-agricultural habitats,farmland margins and farmland interior.The rate of carabidae change from non-agricultural habitat to edges of farmland more than the rate of arthropods change from edges of farmland to farmland internal.The formicidae were contrary to carabidae.