Holmstrup Martin, Maraldo Kristine, Krogh Paul Henning
Department of Terrestrial Ecology, National Environmental Research Institute, P.O. Box 314, Vejlsøvej 25, DK-8600 Silkeborg, Denmark.
Environ Pollut. 2007 Mar;146(2):525-33. doi: 10.1016/j.envpol.2006.07.013. Epub 2006 Sep 18.
Soil microarthropods experience a large range of natural stressors in their natural environment, e.g. variations in temperature and soil moisture, but also anthropogenic stressors such as soil pollutants. In the present study the combined effect of drought stress and copper pollution on microarthropods was investigated in a field study. We hypothesised that microarthropods in copper polluted soil would be more susceptible to drought than animals in control soil. Surprisingly, the abundance of microarthropods in autumn was positively affected by summer drought and copper pollution did not influence the effect of drought in a negative way. The stimulation was mainly seen as an increase of Acari, but also groups of Collembola were positively affected. We suggest that the positive effect of the enforced summer drought could be due to a rapid recovery, which further is accelerated by an increase of food resources (microbes) which have not been utilized during the drought.
土壤微型节肢动物在其自然环境中会经历多种自然压力源，例如温度和土壤湿度的变化，同时也会受到人为压力源的影响，如土壤污染物。在本研究中，通过一项田间试验研究了干旱胁迫和铜污染对微型节肢动物的综合影响。我们假设，与对照土壤中的动物相比，铜污染土壤中的微型节肢动物对干旱更敏感。令人惊讶的是，秋季微型节肢动物的数量受到夏季干旱的积极影响，并且铜污染并未对干旱的影响产生负面影响。这种刺激主要表现为螨类数量的增加，但弹尾目动物群体也受到了积极影响。我们认为，夏季强制干旱产生的积极影响可能是由于快速恢复，而这种恢复又因干旱期间未被利用的食物资源（微生物）的增加而加速。
