Shukurov Nosir, Pen-Mouratov Stanislav, Steinberger Yosef
Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan, Israel.
Environ Int. 2006 Jan;32(1):1-11. doi: 10.1016/j.envint.2004.12.003. Epub 2005 Sep 6.
The effects of ammonium-rich and heavy-metal air pollution produced by the industrial enterprises at Navoiy (Uzbekistan) on soil free-living nematodes and microbial population activities was investigated in soil samples collected in a 5-km radius surrounding the industrial enterprises. At each location (n=4), soil samples were collected from the upper layer (0-10 cm) for determination of soil moisture (SM), total organic carbon (C(org)), total soluble nitrogen (TSN), soil electrical conductivity (EC) and cations (Ca(2+), K(+), Na(+)). Heavy metals (As, Cu, Pb, Zn), soil basal respiration (BR), microbial biomass (C(mic)) and nematode populations were determined. The highest level of TSN was found near the industrial enterprises, with 23.8 and 24.0 mg/kg at NavoiAzot and NavoiGRES, respectively. Soil sample pH was found to be weakly alkaline, with levels ranging between 7.9 and 8.1. Mean soil moisture content varied from 0.75% to 0.93% of the wet weight, without any significant differences between the sampling stations. The heavy metals As, Cu, Pb and Zn were accumulated in the upper soil layer. A significant difference was found between soil heavy-metal content for Cu (p<0.0005) and As (p<0.02). Basal respiration and microbial coefficient (C(mic)/C(org)) were found to be significantly negatively correlated with Cu and As soil content. A significantly positive correlation was found between the Cd concentration and the metabolic quotient (qCO(2)) (p<0.003). No significant correlation was observed between the soil microbial population and total soluble nitrogen. Furthermore, the qCO(2), which is a known ecophysiological index for the soil microbial population, was found to be correlated with the total number of nematodes in general and with the bacteriovore-feeding group in particular. No significant correlation was observed between the soil microbial population and total soluble nitrogen.
对乌兹别克斯坦纳沃伊市工业企业产生的富含铵和重金属的空气污染，在环绕工业企业半径5公里范围内采集的土壤样本中，研究了其对土壤中自由生活线虫和微生物种群活性的影响。在每个地点（n = 4），从上层（0 - 10厘米）采集土壤样本，用于测定土壤湿度（SM）、总有机碳（C(org)）、总可溶性氮（TSN）、土壤电导率（EC）和阳离子（Ca(2+)、K(+)、Na(+)）。测定了重金属（As、Cu、Pb、Zn）、土壤基础呼吸（BR）、微生物生物量（C(mic)）和线虫种群。在工业企业附近发现TSN的最高水平，在纳沃伊氮肥厂和纳沃伊热电厂分别为23.8和24.0毫克/千克。发现土壤样本pH呈弱碱性，水平在7.9至8.1之间。平均土壤湿度含量占湿重的0.75%至0.93%，各采样站之间无显著差异。重金属As、Cu、Pb和Zn在上层土壤中积累。发现Cu（p < 0.0005）和As（p < 0.02）的土壤重金属含量存在显著差异。基础呼吸和微生物系数（C(mic)/C(org)）与土壤中Cu和As含量呈显著负相关。发现Cd浓度与代谢商（qCO(2)）之间存在显著正相关（p < 0.003）。未观察到土壤微生物种群与总可溶性氮之间存在显著相关性。此外，作为土壤微生物种群已知生态生理指标的qCO(2)，总体上与线虫总数相关，尤其与食细菌线虫类群相关。未观察到土壤微生物种群与总可溶性氮之间存在显著相关性。
