Abstract: To examine the effects of the combined application of organic materials and chemical fertilizer on the community structure of soil meso and micro-arthropods in wheatmaize rotation system in North China, five different fertilization treatments were carried out in Ninghe District, Tianjin. The treatments included chemical fertilizer application (A1), bio-organic fertilizer application (A2), combined application of chemical and bio-organic fertilizer (A3), chemical fertilizer application with straw returning (A4), combined application of chemical and bio-organic fertilizer with straw returning (A5). The results showed that a total of 1237 soil meso and micro-arthropods were recorded, belonging to four classes, seven orders and 36 families. Acariformes and Collembola were dominant groups in all treatments. Perlohmanniidae and Isotomidae were the dominant families in wheat season, while Perlohmanniidae and Mochlozetidae were the dominant families in maize season. Total individual number and diversity index (H) of arthropods in A5 treatment were significantly higher than that in other treatments in wheat season (P<0.05). The total individual number of soil meso and micro-arthropods varied across the treatments with an order of A5=A4>A2>A3>A1. Diversity index, evenness index and richness index of A4 treatment were significantly different from that of A1 treatment in maize season (P<0.05). The results of community similarity analysis showed that community composition heterogeneity of soil animals was high and the similarity coefficient was low in different fertilization treatments. These results indicated that fertilization regimes significantly affected the composition and structure of soil arthropod community. Bio-organic fertilizer application and straw returning significantly affected the abundance, diversity index and richness index of soil animals. The combined application of chemical and bio-organic fertilizer with straw returning was more conducive to the stability of soil animal community structure.

Key words: water source, drought stress., water use efficient, Eucalyptus urophylla ×E. grandis