有机质添加对铅污染农田土生态功能稳定性的影响研究

Effects of organic matter on the ecological stability of lead contaminated agricultural soil

应用磷脂脂肪酸(PLFA)分析方法,研究有机质的添加对受到不同程度铅污染的土壤中微生物群落的结构和多样性的影响,探讨土壤有机质含量与铅污染土壤稳定性的相关关系。结果表明:在受到重金属铅污染的土壤微生物群落中细菌占主导地位;土壤铅污染越严重、有机质含量越低,土壤微生物的多样性越低,反之多样性越高;革兰氏阴性菌和真菌与有机质含量和土壤稳定性呈显著正相关关系(P<0.01)。可通过提高铅污染土壤中有机质含量来增强土壤的生态功能稳定性。

This experiment explored the relationship between soil organic matter content and the stability of lead contaminated soil, and studied the effects of different levels of lead contaminated soil amended by adding organic matters on the microbial community structure and diversity using the phospholipid fatty acid（PLFA）analysis method. The results showed that the bacteria are dominant in lead contaminated soil microbial community. The less lead contamination and the less organic matter content in the soil, the lower soil microbial diversity it will have, whereas the diversity is higher. G-and fungus with organic content and soil stability are significant positive correlations（P0.01）; the ecological stability of lead contaminated soil can be enhanced by improving soil organic matter content.