地表裂缝对油蒿根际生物活性的影响及其动态演变特征

 以裂缝未经过的油蒿为对照, 利用统计分析方法系统研究了神东矿区补连塔煤矿有裂缝经过的油蒿根际微生物数量和酶活性的动态演变特征, 以了解煤炭开采引起的地表裂缝对油蒿根际生物活性的影响, 为采煤沉陷区的生态修复提供理论依据.结果表明, 地表裂缝出现后, 油蒿根际细菌、放线菌的数量减少, 真菌的数量增加, 酶的活性提高, 土壤含水量和电导率下降, 地表裂缝对油蒿根际的生物活性造成明显的干扰破坏.经过一年多的时间, 随着地表裂缝的逐渐闭合, 油蒿根际土壤含水量恢复正常, 电导率、蔗糖酶活性和磷酸酶活性受地表裂缝的影响逐渐减弱, 而微生物数量受地表裂缝的影响未见明显好转.可见, 油蒿根际的生物活性具有一定的自修复能力, 但进程比较缓慢.

Effects of Surface Cracks on Microorganisms Quantity and Enzyme Activities in the Rhizosphere of Artemisia ordosica and Its Dynamic Evolution Characteristics

In contrast with those Artemisia ordosica which does not been passed through by the cracks caused by underground coal mining in Shendong mining area, Bulianta coal mine, the dynamic evolution characteristics of microorganisms quantity and enzyme activities of soil in the rhizosphere of A. ordosica passed through by the cracks are analyzed by using statistical analytical method. The results show that after the surface cracks appeared, the number of bacteria and actinomyces in the rhizosphere of A. ordosica is reduced, the number of fungi and the activity of enzyme are increased, the amounts of water content and electric conductivity are decreased, therefore the interferences of surface cracks on the biological activity in the rhizosphere of A. ordosica are quite obvious. After more than a year, with surface cracks gradually close, the content of soil water gradually returned to the normal, the effects of surface cracks on phosphatase activity, sucrase activity, and electric conductivity are gradually weakened, while the effect of surface cracks on the number of microorganisms does not change obviously. Nevertheless, the biological activity in the rhizosphere of A. ordosica possesses certain self-repair ability; however the complete recovery of biological activity might take a longer time.