同为废弃物的煤矸石和城市污泥在性质上存在着一定的互补性，目前针对协同利用这2种废弃物的研究较少。为探究煤矸石与城市污泥混合制备植生基质的可行性并得到具体的高效利用方式，研究使用不同体积占比（50%、60%、70%、80%、90%）和不同粒径大小（≤2目(8.0 mm)、≤4目(4.75 mm)、≤8目(2.36 mm)）的煤矸石与城市污泥混合制成15种植生基质，施用于沙土并种植高羊茅（Festuca arundinacea L.），通过测定分析土壤重金属和营养元素含量以及植物的发芽率和生物量积累情况来评价煤矸石与城市污泥共处置的效果。结果表明：污泥可作为植生基质的主要营养源，尤其可以提供大量的磷元素；煤矸石本身含有一定的营养物质且可以调节植生基质的物理结构，使其更适用于困难立地；与其他粒径组相比，煤矸石粒径大小≤8目时土壤中的有机物含量显著提高（P<0.01）；煤矸石的体积占比和粒径大小都对高羊茅的生物量积累有显著影响且两变量之间有明显的交互作用，综合考虑得到当煤矸石与城市污泥的体积配比为1∶1（煤矸石体积占比50%），煤矸石粒径大小≤8目时，土壤的保水保肥性表现最佳，煤矸石的养分可以得到更为全面的补充，制得的植生基质可以得到相对最佳的土壤改良效果，验证了煤矸石与城市污泥混合制成植生基质的协同利用方法具有可行性。

Coal gangue and municipal sludge, which are both wastes, have certain complementarities in nature, and there are still few studies on the synergistic utilization of these two wastes. In order to explore the feasibility of the preparation of plant substrate by mixing coal gangue and municipal sludge, and to obtain specific and efficient utilization methods, different volume proportions (5 levels：50%，60%，70%，80%，90%) and different particle sizes (3 levels：coal gangue≤2 mesh，≤4 mesh，≤8 mesh) of coal were mixed with municipal sludge to make planting substrate and planted with tall Festuca arundinacea L. in sandy soil. The effects of co-disposal of coal gangue and municipal sludge were evaluated by measuring and analyzing the contents of heavy metals and nutrient elements in soil and the germination rate and biomass accumulation of plants. The results show that sludge is the main nutrient source of plant growth substrate, especially it can provide a lot of phosphorus element. Coal gangue itself contains considerable nutrients and can adjust the physical structure of plant substrate to make it more suitable for difficult sites. Compared with the other particle size groups, when the particle size of coal gangue is less than or equal to 8 mesh, the content of organic matter in soil is significantly increased (P<0.01);. both the volume proportion and particle size of gangue have significant effects on biomass accumulation of high fescue，and there is an obvious interaction between the two variables. Comprehensive consideration shows that when the volume ratio of coal gangue and municipal sludge is 1:1 (the volume of coal gangue accounts for 50%), and the particle size of coal gangue is ≤8 mesh, the performance of water retention and fertilizer retention is the best, and the nutrients of coal gangue can be more comprehensively supplemented and the prepared vegetative substrate can obtain relatively best soil improvement effect, which verifies the synergy of coal gangue mixed with urban sludge to make vegetative substrate.