Preliminary Study On The Color Reaction And Community Structure Of Arthropods In Soybean Feild

We use10different colored cards to capture the arthropods in soybean field, then identified the specimen of different color, analysed the color reaction of arthropods, compared the richness, diversity and evenness of arthropods communities, similaritiy index were used to analyseed the similarity of arthropods in different color.More than19000insects, which belong to258species,10orders were captured by10different colored cards. Colortaxis of each color is:Diptera showed a strong color tendency to dark blue, Homoptera to yellow,Coleopteran to purple, Hymenoptera to yellow, Thysanoptera to dark blue, Hemiptara to light blue, Neuropteran to black, Lepidoptera to white, Orthoptera to dark green and spider to light green.The result of richness, diversity and evenness showed that richness is similar among all the color, gray is largest in diversity and evenness. With the changing of the seasons,richness, diversity and evenness of arthropods communities are different in different colors. In red, diversity of arthropods community is low-high-low-high. In yellow, richness gradually decreased, both of diversity and evenness are very low. Richness in light green showed up a tendency of high-low-high-low,diversity is low and evenness is high. In dark blue, richnessm, diversity and evenness are all very low.We grouped the arthoropods communities by similarity of different color throughout the whole growth period of soybean, and found that red and gray have the highest similarity, white is also very close to red and gray. In the flowering period,arthoropod communities can be divided into two system according to their color reaction, one system is dark blue, light green, dark green, light blue and yellow, the other one is purple, white, gray, black and red. In the podding period, there are also two system, one is light blue and black, the other one is dark green, purple, dark blue, light blue, gray, white, yellow and red. There are three systerm in the grain filling stage, the first is dark blue and purple, the second is dark green, yellow and light green, the third is white, black, gray, light blue and red.In the comparation of insect pest, natural enemy and neutral insect, insect pests have the highest ratio, but in different color, natural enemy and neutral insect have different rotio. So when we use colored cards to prevent insect pests, we should also think about the influence on natual enemy and neutral insect of that color. Richness, diversity and evenness of insects pests.,natral eremy and neutral insect are differ from each other in different color. Richness of insect pests and nature enemy are nearly the same while diversity and evenness are different. Diversity and evenness of nature enemy is higher than insect pests and neutral insect in almost every color, which implied that nature enemy captured by clored card are stable, no color tendency. Because aphid, beafhopper have strong tendency to yellow and light green, thrip have a strong tendency to dark blue, so diversity and evenness of insect community is much lower than nature enemy.