石灰岩渣场灌木喷播技术试验

  目的  渣场环境条件下植被自然恢复极其困难。石灰岩渣场因成土母质等具有其独特性，在一般客土喷播技术的基础上，需要根据其特点探求适宜的植被恢复方法。  方法  该研究模拟渣场表面灌浆处理后客土喷播植被恢复的过程，通过后期观察植被恢复及养分流失情况，比较3种渣场灌浆深度（15、30、45 cm）的植被恢复效果，并结合技术经济效益分析，选取出综合效益最佳的灌浆深度。  结果  与未灌浆处理的对照组（CK）相比，灌浆处理后播种紫穗槐的保存率、平均株高、地径和土壤养分含量均有显著提升（P < 0.05），单位面积渗滤液量和营养元素流失量显著降低（P < 0.05）。结果显示，灌浆深度为30 cm时，植被恢复效果较优。  结论  灌浆处理能提高土壤保水保肥能力和紫穗槐的保存率，同时促进其生长发育，当灌浆深度为30 cm时综合效益较佳。该研究为石灰岩渣场的植被恢复提供技术参考。 

Experiment on shrub spray sowing technology in limestone dreg field

  Objective  The natural restoration of vegetation is seriously restricted by environmental conditions in the dreg field. Due to the unique soil parent material, it is necessary to explore the suitable vegetation restoration methods based on the general soil spray sowing technique.   Method  In this study, we simulated the process of vegetation restoration after grouting the surface of the dreg field and performing soil spray sowing. By comparing the vegetation restoration and nutrient loss of three grouting depths (15, 30 and 45 cm), and combining the technical and economic benefits simultaneously, the best grouting depth was selected.   Result  Compared with the control group (CK) without grouting treatment, the retention rate, average plant height and ground diameter of Amorpha fruticosa and soil nutrient condition significantly increased (P < 0.05) after grouting treatment. Meanwhile, the volume of leachate per unit area and the loss of nutrient remarkably decreased (P < 0.05). In terms of vegetation restoration, the grouting depth of 30 cm was much better.   Conclusion  The grouting treatment can improve the soil water and fertilizer retention capacity, the retention rate of Amorpha fruticosa, and further promote its growth. The benefits are better when the grouting depth is 30 cm. This research provides technical reference for vegetation restoration in limestone dreg field.