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首页> 美国政府科技报告 >Effect of Spray Irrigation of Municipal Wastewater on Soil Invertebrate Populations and the Potential Influence on Physical Factors of Soil.
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Effect of Spray Irrigation of Municipal Wastewater on Soil Invertebrate Populations and the Potential Influence on Physical Factors of Soil.

机译：城市污水喷灌对土壤无脊椎动物种群的影响及对土壤物理因子的影响。

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Soil invertebrate samples were collected for three years from four effluent treated and untreated sites at The Pennsylvania State University. In general,the species diversity and populations of most soil microarthropods decreased on irrigated sites. This group of soil organisms is comprised of fungivores such as collembolans and oribatid mites,predators and fungivores represented by the prostigmatid mites and predaceous mesostigmatid mites. One taxon of mites,the fungivorous astigmatids,remained unchanged by treatment. This finding is important in irrigation studies since population increases in astigmatids on a site are indicative of anaerobic conditions. Total numbers and biomass of earthworms increased with treatment. Earthworms on treated sites have no effect on soil bulk density changes,whereas, a direct relationship exists between worm biomass and soil porosity. Formation of specific sized water stable soil aggregates appears to be related to presence and population increases of specific species of earthworms. Although there is no gross trace metal uptake by earthworms and no heavy metal toxicity occurring as a result of irrigation,different earthworm types and life stages accumulate Cu,Zn and Cd in species specific concentrations.

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