丛枝菌根真菌和腐殖酸联合作用对矿区沙土改良效应

 针对神东矿区采煤塌陷地土壤不断沙化、植物难以定植的特点，通过室内盆栽模拟试验，研究丛枝菌根真菌和腐殖酸联合作用对矿区沙土改良效应。结果表明，丛枝菌根真菌和腐殖酸联合作用提高了玉米生物量和根系活力。当施加腐殖酸质量分数为0.05%时，菌根与其联合作用对玉米生长和沙土的改良效果最优，玉米干质量比空白对照组高出73%，根际土壤中的有效磷含量和酸性磷酸酶活性分别提高了30%和49%，玉米根际土壤菌丝密度比空白对照提高了0.8 m/g，且根际土壤中微生物数量增加显著。丛枝菌根真菌和腐殖酸联合作用有利于玉米生长，对退化沙土具有改良效应。

Improvemental Effects of Arbuscular Mycorrhizal Fungi and Humic Acid on Sandy Soil in Shendong Mining Area

Mining activities have severe deleterious effects on plants and soil fertility that must be ameliorated with additional amendments in order to achieve successful ecological restoration in the Shendong mining area in Shaanxi Province. Pot experiment is set up to investigate combined effects of arbuscular mycorrhizal fungi and humic acid on the mining soil. The results show that the combined effect can improve the maize biomass and root vigor. When humic acid whose concentration is 0.05% is added, the dry weight of maize is 73% higher than the controled, and the available phosphorus content and acid phosphatase activity are improved by 30% and 49%, respectively, indicating that the improvement effect on maize growth and soil is optimal. The hyphal density in rhizosphere soil of maiz is 0.8 m/g higher than that of the controled, and microorganisms in rhizosphere soil is increased significantly. Combined effects of arbuscular mycorrhizal fungi and humic acid are conductive to maize growth and the degraded soil improvement.