This paper describes a technology of ecological bag which has been used for years in the country for greening bare rock slopes,and summarizes both its successes and failures in the application.In this paper,field investigation and indoor experiments were conducted in Jiaozuo City,Henan Province concerning ecological bags applied to the greening of rock slopes in terms of four aspects,i.e.the mechanical parameters,filling matrix,slope gradient and selection of the plants.The main conclusions drawn from the investigation indicated that better effects of slope treatment using ecological bag would be achieved when the slope angle is no more than 63°;Ecological bags with the rainfall infiltration coefficient greater than 0.36better fit for the need of the greening work.As to the plants in the ecological bag when being applied in the north China,alternative species are recommended such as Setaria viridis (L.)Beauv.,Cynodon dactylon (L.) Pers.and Festuca elata Keng ex E.Alexeev.

On the basis of quadrat investigation,sample pit excavation,root mass investigation,below ground habitat profile survey and combined with laboratory analysis,the investigation approaches of plant below-ground habitat were studied.The results showed that:(1) The distribution statistical anal ysis of plant root can be precise and intutuve to find every life-form plant boundary layer of belowground habitat depth,through below-ground habitat profile survey and laboratory analysis,land vertical different physical and chemical characteristics were obtained.(2) Combining the root of the synusia features,the structure of the below-ground habitat and the investigation of plant quadrat can clarify the ecology relations of plant growth and plant below-ground habitat,to explain species diversity and build the community structure links with the below-ground habitat.(3) The depth of root mass of different species is different,and the hierarchy law is obvious,the synusia of root mass and the layer of belowground habitat has a very good correlation.

Vegetation below-ground habitat is the material basis for the survival of vegetation,and root system is the bond to the survival of vegetation and vegetation below-ground habitat.The distribution and morphological characteristics of roots in the rock can be reflected on the environmental conditions of utilization of vegetation.In this article,with experimental investigation of vegetation root development,based on the theoretical basis of ecological geology,we made an analysis of the survival space of vegetation in rock fracture and its below-ground habitat conditions (temperature,moisture,soil fields as a nutrient,etc.),to get the following conclusions:Under the condition of high-steep rock slope,vegetation root mass has a shallow range,and it can root into fractured rock deeply with a flat form;the conditions of vegetation below-ground habitat (temperature,moisture,soil fields as a nutrient,etc.) can meet the needs of development of vegetation in different seasons;the technology makes a full use of the artificial conditions of vegetation below-ground habitat in rock fissures,providing a new idea for the high-steep rock slopes recovering green.

Water vapour field is a general term used to describe the temperature in the unsaturated water zone of the fractured rock mass and the temporal distribution of water and vapor.Some key questions have not been examined until now such as the distribution of temperature-humidity in the water vapor field of the fractured rock mass as well as the laws of vapor-liquid transformation in the water vapor field.The Jinping Mountain of Yiyang county is taken as an case study in this paper and the distribution of temperature-humidity as well as the laws of vapor-liquid transformation in the water vapor field are analyzed using the measured temperature and moisture at all seasons in the long-term monitoring holes.The research results show that (1) spring and summer are the main periods for the increase in water and heat in the fractured rock,when the humiture in the water vapor field of fractured rock gradually raises from the inside out.Distribution range of the internal condensation water in fractured rock is large and its external counterpart on the boundary is about 20 cm.(2) Conversely,water and heat in the fractured rock decrease and the humiture gradually reduces from the inside out in autumn and winter.The nternal water distribution range of fractured rock is small while that on the outside ranges from 50 to 200 cm.

With the consistent development of urbanization and industrialization of human society,the accumulation of heavy metals in the soil has been a serious threat to the environment and human beings. Phytoremediation to the heavy metal contaminated soil is considered as an environmental-friendly treatment which gets more and more attention from domestic and overseas for its low cost,in situ and other advantages. Referring to a mountain of domestic and foreign literatures,this paper presents the research progress of the hyperaccumulators,the theory of hyperaccumulator phytoremediation and the disposal of hyperaccumulator phytoremediation,from the standpoints of the source and harm of heavy metal contamination.The problems, the researches and the applications in the future are also briefly discussed in this paper.33refs.