| Studies of effect of long-term fertilizer on agricultural soil fauna community had focused on different soil type and same soil type in the State's Long-term Monitor Network for Soil Fertility and Fertilizer Efficiency, and made some comparison between forest and agricultural soil fauna community, and soil security was also primarily studied.1 Effect of long-term fertilization on soil fauna community at different soil type10542 individual of soil animals collected from 5 soil types by handsorting, Cobb methods and modified Tullgren, belonging to 6 Phyla,12 Classes,23 Orders,61 families, and 35 genera, Nemata, Oligochaeta, Acariformes and Collembola had great impacts on agricultural ecological system, the trophic behaviors of these fauna are mainly Phytophagous. The biodiversity and zone characteristics in different soil type were obvious.The result of variance analysis procedure showed mat soil type had extremely significant impacts on the density of soil fauna (F = 4.20, p = 0.0023), but not significant to fertilization treatment (F=0.71, p = 0.6190) . while, the density of 10 key groups of soil fauna was affected by fertilization treatment and even extremely significant (F = 3.70, p = 0.0030 ) , the soil type not significant (F=0.71, p = 0.5842) .The result of Canonical correlation analysis showed that soil organic matter, pH and total nitrogen mostly affected the density of Nemata, Acariformes and Collembola. 7.34% of variance of soil fauna in 5 types of soil was explained by the first canonical variable of soil factor variable, and 16.91% of variance of soil factors in 5 types of the soil was explained by the first canonical variable of soil fauna variable, but the rest was not interpreted yet.2 Effect of long-term fertilization on soil fauna community at same soil typeA case of loess area in long-term fertilization on soil fauna community, 5495 individuals of soil fauna were obtained by handsorting, Cobb methods and modified Tullgren from 4 surveys in the loess area with 6 fertilization treatments, belonging to 6 Phyla, 11 Classes, 22 Orders, 61 families and 35 genuses. The result showed that the individual density and community of soil fauna decreased with the depth of the soil.The result of variance analysis procedure showed that the season had highly significant impacts on the density of soil fauna (F=4.84, p = 0.0023 ) .while fertilization treatment had no significant impacts (F=0.95, p = 0.4497) .According to the analysis of the relations between the system of fertilization and the main groups of soil fauna, using Principal Component Analysis, different system of fertilization had quite different impacts on fauna; fertilization had great impact on individual density and smaller impacts on community diversity. Therefore, the fertilization treatment primarily affected to the main genera of soil fauna, Nemata's individual density and community diversity.The soil character had greater impacts on die non-dominant community, individual density and Enemata than the main community of microorganisms; Actinomyces had greater impacts on Coleoptera and Oligochaeta opisthopora; Fungi had greater impacts on Isopoda and Formicidae.3. A comparison between forest soil fauna and agricultural in different climatic zones(1) There was no obvious boundary between the topsoil and deep soil in forest soil fauna, while the agricultural soil fauna had no obvious layers and the changes in population density were small. Their community and individual density of soil fauna decreased with the soil depth increasing.(2) The distribution of soil fauna in the forest soil is relatively concentrative while decentralized in agricultural soil. The community diversity of the fauna in the forest soil was obviously higher than that in agricultural soil.According to statistical analysis of centroids clustering, the fauna community in Dinghushan forest soil was similar to that in agricultural soil, while Maoershan's obviously different from that in agricultural soil.Based on the above researches, together with further an...
|
PDF Full Text Request