丛枝菌根真菌与沙棘对露天矿排土场的联合改良效应

我国东部草原露天矿区土壤瘠薄，草场退化严重，生态恢复难度大。针对露天矿排土场的特殊环境，研究丛枝菌根真菌与沙棘的共生状况以及菌根对沙棘根系发育的影响和对排土场土壤的改良效应。试验发现，接菌组(+M)沙棘的株高和冠幅比对照组处理(CK)分别提高了20%和21%，+M的根长和根体积分别为CK的1.46倍和1.97倍；+M中沙棘根际土中的易提取球囊霉素含量为3.22 mg/g，显著高于CK的2.16 mg/g；+M的磷酸酶活性是CK的1.76倍，速效磷含量也有相似变化规律。研究结果表明，利用微生物促进露天矿排土场的土壤改良及生态恢复具有较强的可行性，对矿区生态系统的恢复具有重要意义。 

Effect of arbuscular mycorrhizal fungi and Hippophae rhamnoides on the improvement of the dump of open-pit coal mine in the eastern grassland

The land barren, grassland degradation and difficult ecological restoration are serious in the open-pit mining area of eastern China. The symbiosis between arbuscular mycorrhizal fungi(AMF) and Hippophae rhamnoides and the effect of mycorrhiza on the development of Hippophae rhamnoides root system and the improvement of soil in the dumping site were analyzed. It was found that the plant height and crown width of inoculated AMF(+M) were increased by 20% and 21%, respectively. The root length and root volume of +M were 1.46 and 1.97 times of CK, respectively. The content of Glomalin in the rhizosphere soil of Hippophae rhamnoides in +M was 3.22 mg/g, which was significantly higher than 2.16 mg/g in CK. The phosphatase activity of +M was 1.76 times that of CK, and the content of available phosphorus was similar. The results show that it is feasible to use microorganism to promote soil improvement and ecological restoration of the open-pit mine dump.