张集矿区复垦土壤养分变化研究及评价

煤炭开采引发土地沉陷，耕地资源严重破坏，土地复垦是恢复耕地的重要措施。开展矿区复垦土壤养分变化研究及评价，对于指导矿区土地复垦工作有着重要意义。以淮南张集矿区不同复垦年限的土壤为对象，系统研究了土壤养分的变化。结果表明：随着复垦时间的增加，土壤的有机质、全氮、速效磷和速效钾呈现增加趋势；复垦土壤在垂直层次上表现出随深度的增加，土壤有机质、全氮、速效磷和速效钾有下降的趋势；以正常耕地土壤养分水平作为评价标准时，复垦土壤养分恢复指数呈现增加趋势。

Study and Assessment of the Variability in Fertility of Reclaimed Soil in Zhangji Mine

Coal mining leads to land subsidence and arable land damage. Land reclamation is an important measure for arable land restoration. To study and assess the variability in fertility of reclaimed soil is of great significance to direct the reclamation and reutilization of mining subsided land. The variability of fertility of reclamation soil in Zhangji coal mining area located at Huainan city were studied. The results showed that: the contents of organic matter, total nitrogen, Olsen-phosphorus and available K increased with the extension of time，while the soil fertility reduced with the depth of reclamation soil increasing. Took the soil fertility level of normal arable land as assessment standards, the fertility restoration index of reclamation soil indicated an upward trend with time extending.