| SaiHanba Forest-Farm is located in the northern part of Hebei, and it is the representof the ecotone of Forest-Steppe. In this region, three representative regions that are Forestregion, Forest-steppe region and Meadow-steppe region were selected for study. In May toSeptember in 2006, we studied four times on the diversity of soil arthropod animals in thisaera. This paper was mainly studied the biodiversity of soil arthropod animals incomposition, level and vertical distribution, seasonal variation, biodiversity and similarity,the correlation between soil arthropod animals and soil environment factors and thecoefficient of biotope distribution in the ecotone of Forest -steppe region. The results areas follows.1. A total of 10420 soil arthropod animals that belonged to 6 class, 24 order, and 25groups were collected. The dominant groups were Acarina and Collembola. Commongroups were 8,account for 31.70％.Rare groups were 15,account for 3.29％.Dominant andCommon groups were the main composition in this region, account for 96.70.Amongthem,14 groups,3069 individuals were large-size soil arthropod animals. The dominantgroups were araneid and hymenoptera, account for 53.80％.Common groups were 8,account for 44.34％.Rare groups were 4, account for 1.86％, 11 groups, 7333 individualswere middle-and small-size soil arthropod animals. Dominant and Common groups wereAcarina, Collembola and Psocoptera account for 92.22％and 7.10％.Rare groups were8,account for 0.68％.2. The horizontal distribution of soil arthropod animals in the ecotone appeareddifferent obvious regularity in the different plots. The number of groups of soil arthropodanimals was gradually reduced in the Forest region, Forest-steppe region, and theMeadow-steppe region. The individuals' numbers of soil arthropod animals were most inthe Forest region.The Meadow-steppe region taked the second place. The least was in theForest-steppe region. The vertical distribution of soil arthropod in the ecotone was descendwith the increase if depth of soil layers. They showed obvious nature of surface gathering.The Large and Middle-small soil arthropod animals were the same to the total soilarthropod animals, but in some plots there were the contrary rule.3. The composition and structure of soil animals'community in different seasons weredifferent. With the changes of season, the number of groups and the individuals'number of soil arthropod animals made obvious and regular changes. The number of groups was mostin summer and spring has the least ones. The individuals were the most in autumn, andwere the least in the spring. The number of groups'large-size and middle-and-small-sizesoil arthropod animals had the similar changes with the total number of groups. Theindividuals of soil arthropod animals appeared different varied regularity in differenthabitats with seasonal changes.4. Statistics analysis was indicated that the trend of diversity (H′),evenness,Simpson(C) and DG index were all largest in the Forest region than in the Forest-stepperegion and that higher than in the Meadow-steppe region. The diversity (H′) ofmacrofaunas in the Forest region washighest in the natural second forest community. Andthe DG index was highest in the mixed-forest. The diversity (H′)index of macrofaunas inthe Forest-steppe region was highest in the larix principis-rupprechtii and lowest in theP.sylvestris var.mongolica.And the DG index was highest in the natural second forest, andlowest in the P.sylvestris var.mongolica. The diversity (H′) index and DG index ofmacrofaunas in the Meadow-steppe region were all highest in the larixprincipis-rupprechtii and lowest were all in the natural second forest community. Thediversity (H′) index ofmesofaunas in the Forest region was highest in the natural secondforest and the highest DG index was in the mix-forest. The highest diversity(H′)index ofmesofaunas in the forest-steppe region was in the mix-forest and larix principis-rupprechtiiand the highest DG index was in the natural second forest and mix-forest communities.The diversity (H′)index and DG index ofmesofaunas in the Meadow-steppe region wereall highest in the larix principis-rupprechtii and P.sylvestris var.mongolica.5. According to the similarity index of Jaccard, soil arthropod animals' communitiesof Forest region and Forest-steppe region were the most similar. Forest region andMeadow-steppe region were the least similar. The similarity index in the Forest region ofmacrofaunas community, larix principis-rupprechtii and mix-forest were the most similar.In the Forest-steppe, the similarity index between natural second forest and mix-forest wasthe largest. In the Meadow-steppe region, the similarity index of macrofaunas community,natural second forest and P.sylvestris var.mongolica were the most similar. The similarityindex in the Forest region of mesofaunas community, natural second forest and mix-forestwere the most similar. In the Forest-steppe, the similarity index between larixprincipis-rupprechtii and natural second forest was the largest. In the Meadow-stepperegion, the similarity index of mesofaunas community, natural second forest andP.sylvestris var.mongolica were the most similar, the same to the macrofaunas community.6. Along the change of zone, Log-series distribution model and Log-normaldistribution model could well fit to the species-abundance distribution of macrofaunascommunities, but the Broken-stick distribution model and the Geometry-series distributionmodel couldn't. Mesofaunas communities can only fit to the Log Normal distribution model. The Geometric Series distribution and the Broken Stick models can not be used todescribe the soil arthropod animals in the ecotone of Forest-Steppe region.7. The correlation between the quantity of soil water, soil PH value and soil arthropodanimals'community was obvious, this showed that with the higher quantity of soil water,was useful to the developing of soil arthropod animals. As a whole, soil PH value effectlargely for the number of groups of soil arthropod animals and the individuals of soilarthropod animals. The Interconnect Degree of soil PH value between the total groups,individuals'number of soil arthropod animals and the soil factors was higher than soilquantity of water and that was higher than soil temperature. From the analtic result, wecould saw the interconnect degree and the correlation coefficient were accordant.8. By analyzing the biotope distribution coefficient of soil arthropod animals in thisregion. In the Forest region, it was obvious that the groups of narrow distribution patterngave priority to others and made of the basic of soil arthropod animals. 11 groups werenarrow distribution pattern account for 44％of total collected population, 8 groups werebroad distribution pattern account for 32％and 4 groups were middle distribution patternaccount 16％.In the Forest-steppe region, broad distribution pattern made of the basic ofsoil arthropod animals. 8 groups were broad distribution pattern account for 32％and 4groups were middle distribution pattern account 16％. 7 groups were narrow distributionpattern account for 28％of total collected population. In the Meadow-steppe region, broaddistribution pattern made of the basic of soil arthropod animals. 8 groups were broaddistribution pattern account for 32％and 4 groups were middle distribution pattern account16％.6 groups were narrow distribution pattern account for 25％of total collectedpopulation.
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