Characteristics Of Arthropod And The Influence Of Ecological Environment In The Jujube Orchards With Forages

The study were carried out, including the structure and dynamics of natural enemy, the ecological environment influence by interplanting forage grass. The results were as follows:1. The common characteristics of arthropod between jujube orchard with forage grass, such as birdsfootrefoil, flat stem milkvetch, white clover, and jujube orchard with weeds was that phytophagous arthropods had the most number of individual and species, respectively accounting for above 70% and 40%; that the distinction proportion of individual and species about predatory, parasitic, spider was basic quite, accounting for nearly 10% and 20%; that the number of individual and species of phytophagy among arthropod in the jujube orchard with flat stem milkvetch was most, those of predatory, parasitic were least.2. In different types of jujube orchard, the number of individual and species of different function group (total arthropod, phytophagy, natural enemy) was carried on the analysis of variance (the Duncan law): the number of individual and species of different functional group in the weed -jujube-orchard were remarkably more than the grass -jujube-orchard (P<0.05); in the crown layer, the number of individual and species of phytophagy in the jujube orchard with birdsfootrefoil and white clover was remarkably less to other jujube orchards (P<0.05); on land surface, the number of individual of phytophagy and natural enemy in the jujube orchard with white clover was most (P<0.05); the number of individual of phytophagy in the jujube orchard with bird (?)trefoil was least (P<0.05). The seasonal variation of the different nutrition layers indicated the beneficial arthropod's increase and the harmful arthropod's reduction in the jujube orchard with birdsfootrefoil and white clover surpassed other jujube orchard.3. The community stability of arthropod about different types of jujube orchards was analyzed by Principal Components Analysis, Cluster Analysis of Nearest Neighbor, and the Two-dimensional Plot Analysis. The community stability of the jujube orchard with birdsfootrefoil and white clover was stronger than others, even interfered by varieties of factors.4 The curve estimation of the characteristics of arthropod affected by temperature and humidity in different types of jujube orchards were carried out. Cubic curve estimation was better. The jujube orchard with forage grass and jujube orchard with weeds were taken as sub-species pool and species pool. The species pool is stable and the sub-species pool is not stable. It explained the cause of species flue and offered a new idea for arthropod's establishment analysis.5. The characteristic of spider sub-community was analyzed. The number of individual in the jujube orchard with weeds was more than that in the jujube orchard with forage grass. In the jujube orchard with forage grass, the number of individual and species in the jujube orchard with birdsfootrefoil and white clover was superior. In different types jujube orchards, the individual and species were predominant of Thomisidae, Araneidae, Lycosidae, including...