It is difficult to utilize steel mill sludge because of the high concentration of heavy metals included therein. To passivate the activity of heavy metals, reduce their toxicity, and create a new valuable product, in this study, 4 kg sludge was composted with a combination of earthworms and different ratios (2

This study investigated the effects of adding earthworm mucus on the changes in sludge compost bacterial community structure and its response to environmental factors. The results showed that adding earthworm mucus improved the composting effect of sludge, reducing nitrogen loss and increasing nutrients; nitrogen loss decreased by 5.55%, and potassium and phosphorus increased by 10.23 and 16.28%, respectively. Firmicutes, Chloroflexi, Actinobacteria, and Proteobacteria were the main bacterial phyla in the sludge, with a combined relative abundance of over 60%. The addition of earthworm mucus significantly impacted bacterial community structure and composting activity, increasing the relative abundance of dominant bacteria during the process. Redundancy analysis showed that environmental factors significantly impacted the changes in bacterial community structure during composting. The results indicate that the addition of earthworm mucus increases the relative abundance of advantageous bacteria playing essential roles in sludge composting, enhancing the fertility and maturity of sludge composting products by significantly reducing nitrogen loss and increasing potassium and phosphorus. Based on the response relationship between environmental factors and bacterial communities, the bacterial community structure in sludge composting can be improved by regulating environmental factors (such as pH and moisture content), enhancing the effectiveness of sludge composting.

Heavy metal contamination of coal gangue-filled reclaimed soil is one of the reasons that limits the subsequent use of reclaimed land. The reclaimed soil column groups with two different thickness (L group, 50 cm) and (H group, 70 cm) were set up, and each group included four treatments that were CK (soil without inoculation), E (earthworm inoculation), C (bermudagrass inoculation), and CE (earthworm plus bermudagrass inoculation). The physicochemical properties and behavior of Cr, Cu, Pb, and Zn were analyzed to investigate the effects of earthworm combined with plants on the heavy metals in reclaimed soil. The results showed that different treatments (E, C, and CE) could all reduce the pH, total Cr, Cu, Pb, and Zn contents and increase soil OM, TN, and TP contents in different reclaimed soil column groups. The CE treatment was more effective in reducing total heavy metals contents compared with C and E treatments. The E treatment was able to increase the bioavailability of heavy metals in the soil, while both C and CE treatments decreased the bioavailability of heavy metals. Total Cr, Cu, Pb, and Zn were reduced more significantly in the L group than in the H group. The bioavailability values of Cr and Zn only in CE treatment were reduced lower in H group than those values in the same treatment in L group. Redundancy and correlation analysis indicated that soil pH and OM were the main factors affecting heavy metals behavior in the reclaimed soil. Inoculating earthworms affected the soil pH and OM, which influenced the heavy metals uptake by the bermudagrass. Overall, the study can provide a theoretical basis for the application of earthworms and plants in the remediation of reclaimed soils filled with coal gangue.

Aerobic composting is an effective method of resource treatment for agricultural and forestry solid waste; however, while wheat straw is usually used as a conditioner and is not the main body as in aerobic composting, wheat straw is abundant in annual production, and fertilization is one of the main ways of resource utilization of wheat straw, how to use wheat straw as the main body of aerobic composting for efficient treatment is, therefore, a meaningful research direction. In this paper, to achieve the efficient and economic resource utilization of wheat straw and livestock manure, aerobic composting was carried out with wheat straw as the main body, and pig manure and cow manure were mixed with wheat straw crops at ratios of 20%, 30%, and 40%, respectively, for barrel suspension composting. The changes in pH, EC, NH4+-N, NO3−-N, TN, TP, organic matter and seed germination index, and shoot length inhibition rate before and after composting were compared between treatment groups using different material ratios in the aerobic composting process. The changes in the physicochemical properties and nutrient elements of compost products were studied. The results show that the co-composting of livestock manure and wheat straw can promote the decomposition of the pile, and the addition of 40% cow manure and 30% pig manure has the best effect in promoting decay. In contrast, the addition of excessive pig manure inhibits the decomposition of the pile. Organic matter degradation in the treatment groups using cow manure was more effective than in those using pig manure, and the best results were obtained with 40% cow manure. The pile was alkaline at the end of each treatment, and the wheat straw compost treated with 40% cow manure had the best nitrogen and phosphorus retention. The wheat straw compost treated with 40% cow manure had the highest integrated degree of decomposition, which promoted the deterioration of the pile and provided a research basis for the use of wheat straw as an efficient resource.

本文主要简单介绍了加强受损山体植被恢复设计的必要性，阐述了受损山体植被恢复设计原则，分析了现阶段受损山体植被恢复设计的主要方式，探讨了受损山体植被恢复中新技术的应用，旨在转变传统的受损山体植被恢复模式，不断地创新植被恢复新技术，重视山体植被恢复工作的开展，贯彻落实我国环境保护政策要求，改善当前的生态环境状况，从而坚持走可持续发展道路。

坡面绿化施工是园林工程中的重要组成部分,具有一定的观赏性特征,可以有效提升园林绿化工程的植被覆盖率,但坡面自然条件很容易受雨水冲刷的影响,所以地质环境也容易出现下降问题.为此,对市政园林工程的坡面绿化施工进行研究,就市政园林坡面绿化施工应遵循的基本原则,提出了相应的坡面绿化施工技术与养护策略,具有重要参考价值.

本文在收集有关资料、跟踪调查研究的基础上,对庐江县庐南矾山治理区受损现状、成因、治理途径及植被生态修复效果从不同角度进行了系统性评价与综合分析,总结了受损山体有关生态治理措施、植被修复技术优缺点,并给出了相应的改进建议,提出了受损山体的植被生态修复新的治理模式,为提升我省同类型的受损山体植被生态修复奠定了理论基础与实践经验.

[Objective]The aim was to study the in vitro rapid propagation technology of Hosta plantaginea'Tickle Me Pink'.[Method]The leaves of H.plantaginea'Tickle Me Pink'were used as the explants to study the effects of different sterilization methods,different kinds and concentrations of plant growth regulators on callus induction,callus proliferation,and plant regeneration.[Result]The optimal disinfection method for explants was to disinfect with 0.5%sodium dichloroisocyanurate solution for 15 minutes,the optimal culture medium for callus induction was MS+1.0 mg/L TDZ+1.0 mg/L 2,4-D,the optimal culture medium for callus proliferation was MS+2.0 mg/L 6-BA+0.5 mg/L NAA,the optimal culture medium for bud proliferation was MS+1.0 mg/L TDZ+1.0 mg/L 2,4-D,and the optimal culture medium for rooting was 1/2 MS+0.1 mg/L NAA.[Conclusion]This study can not only enrich the resources of H.plantaginea in northern Anhui and meet the market demand,but also provide practical basis and theoretical guidance for tissue culture of H.plantaginea,laying a foundation for screening excellent clones.