Study On Soil Animal Community Structure In Solidago Canadensis L.Habitat Of The Riparian Zone

Riparian zone vegetation plays an important role in the formation of physical and biological properties for rivers and has important significance in stability of marina shore and continuity of the whole function of river ecosystem. Due to the biological characteristics of Solidago canadensis L., make it plundered resources has a strong competitive power, which gradually supplanted local plants and made the local biodiversity reduced greatly. Therefore, study of invasion plant of Solidago canadensis L. in riparizn zone had the vital significance both for native plant biodiversity protection and for the protection of river ecosystem. Soil animals as an important part of the whole soil ecosystem could not be ignored in each link of the material energy cycle of the soil ecosystem. From the change of plant community can observe the change of soil animal at the same time, also can observe the invasive plants on biodiversity impact degree and the health of environment from structure change of the soil animal community. In this paper, based on the current situation of study on soil animal, soil animal community structure in Solidago canadensis L. habitat of the riparian zone was studied, aimed to comprehend soil animal community structure in Solidago canadensis L. habitat of the riparian zone. Through the comparison of different zone to study influence of Solidago canadensis L. on soil animal community structure, and provide a basis for biodiversity conservation in riparian zone. In this paper, research results are as follows:1In Solidago canadensis L. habitat of the riparian zone, soil macro-animals were found belongs to30groups,9classes and3phylums. The density of soil macro-animals was408ind.· m-2and most were found in the soil suiface. The dominant groups were the armadillidiidae and formicidae. Soil meso-and micro-animals were found belongs to35groups,15classes and6phylums. The density of soil meso-and micro-animals was42619ind.· m-2and mainly were found in the soil surface. The dominant groups were nematoda and acarina. The density and the number of groups of Soil macro-animal are higher in summer and autumn, while which of the soil meso-and micro-animal is higher in the autumn and winter.2The density, group number and diversity index of soil macro-animal in Solidago canadensis L. habitat are higher compared to artificial tree forest and artificial grass of unber green area, while the density of soil meso-and micro-animal is lower and there is small difference in diversity index. Solidago canadensis L. has an active effect on dominance of chilopoda and diplura obviously while has a negative effect on the dominance of stylommatophora, collembola, orthoptera, homoptera and microdrile oligochaetes. What’s more, because of reduced litter, the survival of the collembola is also significantly restricted. With the increase in the degree of intrusion, the density of soil macro-animal decreased slightly with the increase in the number of group. By contrast, the density and group number of the meso-and micro-animal increased slightly and the diversity index of soil animal increased.3The impact of riparian zone on soil animal community structure is that the closer to rivers, the higher the density of soil animal community, and the higher the group number of soil macro-animal while the lower the group number of soil meso-and micro-animal. In terms of dominant species, the densities of microdrile oligochaetes, armadillidiidae, formicidae, nematoda and acarina are higher in the nearshore belt transect, while that of macrodrile oligochaetes, araneae and collembolan is lower in the intermediate belt transect. Riparian zone has a bigger impact on the seasonal changes of soil macro-animal and have less impact on the seasonal changes of soil meso-and micro-animals. The impact of riparian zone on diversity index of soil animal community is not obvious.4Soil environmental factors have significant seasonal variation. The impact of Solidago canadensis L. on the temperature is low, while other factors are declined affected by the invasion. Soil temperature has a bigger impact on the soil animal community structure. Temperature correlations with the soil animal community structure, especially the dominant species such as armadillidiidae and araneae. Temperature and soil meso-and micro-animal are correlated negatively. The impacts of conductivity, bulk density and water content on the density of soil animal, groups and dominant groups are not obvious. However, nematoda presents significant positive correlation with conductivity, bulk density and water content.Nutrients are mainly concentrated in the soil surface (0-5cm). Organic carbon content has significant effects on macro-soil animal community structure, and has less effect on soil meso-and micro-animal community structure. The invasion of Solidago canadensis L increases the total nitrogen content slightly. The change of total nitrogen content has significant effects on soil animal community structure. The density of advantage groups like oligachaeta、araneae、nematoda and acarina is significantly effected, especially the oligachaeta. The change of total phosphorus content has non-significant effects on soil animal community structure, but it has significant effects on collembola.