Advanced Materials Research Vols. 864-867

Abstract: To study the shear dilatancy of geotechnical material of typical landslide of levee slope, the article established the geotechnical elasto-plastic constitutive model base on the generalized plastic mechanics theory, through theoretical analysis and mathematical deduction. Then, through arranging and quoting geotechnical material mechanics experiment datas of typical landslide of levee slope in Nanning, the article drawed all kinds of stress-strain curves of constitutive model. By comparing the test curve and theoretical curve, the article verifies the rationality of the model.

Abstract: According to different specifications of sand barrier and different parts of dunes, soil hardness of topsoil and different depths of soil were measured, then analyzed the influences of sandbag sand barrier on soil hardness, the results show: The soil hardness of dunes which lay 1m × 1m, 2m × 2m and diamond 3 kinds of specifications sand barrier are significantly higher than the soil hardness of bare dunes (P<0.05), and the soil hardness of 1m × 1m, 2m × 2m sand barrier does not differ obviously, but significantly higher than the soil hardness of diamond sand barrier. The soil hardness of different parts of dunes which lay 1m × 1m, 2m × 2m sand barrier have similar trend, both the lower of windward slope > middle > upper, and the soil hardness of the 3 parts have significantly different (p<0.01), while diamond sand barrier have no significant trend. The soil hardness of 3 specifications sand barrier within a single barrier grid is unevenly distributed. Sandbag sand barrier have impact on vegetation, the soil hardness at different depths is indirectly affected by the vegetation to be affected.

Abstract: With the rapid development of social economy and agricultural modernization, in the process of land utilization should not only the pursuit of high efficiency, more to the protection of land resources, by means of detection and Analysis on soil characteristics, understand the soil in theexploitation and protection of restricting factors in the process, and puts forward the corresponding proposal and according to relevant personageopinion, for reference.

Abstract: Soil microbial plays a very important role in the grassland ecosystems, but measured data is very lack. In this paper, based on the ground survey data microbial dynamic changes in growing seasons of Desert steppe in 2012 was estimated. The main conclusions are as follows: soil bacteria number began to increase in May, reached to highest value in July and then began to decrease. Actinomycetes population increased first and then decreased. Fungus amount decreased in beginning and then increased. Grazing significantly affect the number of soil microbial, shown as soil microbial of very severe grazing fences are significantly lower than other fences.

Abstract: In this paper, based on RS and GIS technology and landscape pattern analysis, the changes of ecological landscape in the Poyang Lake Eco-economic Zone were analyzed from 1990 to 2005. Main results are as follows. There was a decreasing trend of wetland and forest from 1990 to 2005. The result of landscape pattern analysis showed that there was an increase in the degree of fragmentation of ecological landscape in the study area. The increased Perimeter-area fractal dimension indicated the shape of ecological landscape became more and more rules. Aggregation Index (AI) of lake increased from 86.0066 in 1990 to 86.123 in 2005, which showed that the overall aggregation degree of ecological landscape in the Poyang Lake Eco-economic Zone is in rise.

Abstract: Soil total organic carbon (TOC), readily oxidizable C (ROC), and microbial biomass C (MBC) were determined at the different ages of tea in Three Gorges Reservoir area, China. The results showed that soil TOC and ROC in the 0-20cm decreased gradually with age of tea garden, whereas MBC had no significant difference among sites. OC, ROC, and MBC decreased readily with depth. Soil total organic C only showed a significantly positive relationship with readily oxidizable C. The age of tea showed a significantly negative relationship with TOC and ROC.

Abstract: Magnetic Susceptibility values of garden soil, agriculture ecosystem park soil and soil in urban-rural ecological transition zone in Xuchang city are smaller than 100×10^-8 m³/kg, and the frequency magnetic susceptibility values are more than 3%, such is different from soils influenced by industrial. That above three kinds of soils with slight pollution are effected by different land uses show soil magnetic Susceptibility is a powerful indicator of soil pollution. The result of soil magnetic Susceptibility is higher shows that he pollution threats exist in agriculture ecosystem parks in villages and towns around the city.

Abstract: In this paper, artificial wetland systems, aeration tanks, rapid filter combined biological wastewater treatment process facilities for domestic sewage treatment. Test systems,TN treatment effect, are higher than the value of surface water quality standard GB3838-2002 in V class standards.Treatment effect to achieve the urban sewage treatment plant pollutant discharge standards GB18918-2002 a class of emission standards, the treatment system, low cost, easy management, stable operation.

Abstract: Spatio-temporal pattern of cultivated land change and its influencing factors in the Poyang Lake Ecological Economic Zone were conducted by exploratory spatial data analysis and spatial autocorrelation analysis. Results show that there is an obvious correlation for the spatial distribution of cultivated land in the Poyang Lake Eco-economics Zone. Its value of Morans I reduced from 0.4574 in 2002 to 0.4092 in 2008, and then increased to 0.4352 in 2009, which roughly presented a "U" type distribution. Total population is the most important factor that affecting the change of cultivated areas in the Poyang Lake Eco-economics Zone. Agricultural growth, average wage of urban residents and the fixed assets investment are also the main driving factors. Spatial auto-regression model is an effective tool for revaluating the spatial distribution of regional cultivated land, and revealing the evolution mechanisms of cultivated land.

Abstract: This thesis summarizes the main problems of the developing countryside in southern China. The rural infrastructure backwardness causes its overall look backward, losing its local cultural characteristics. It uses landscape planning to realize the optimization of basic rural construction and the beauty of the environment. It focuses on developing the core landscape -- village cultural square and village ecological corridor, using square and corridor segmentation and reasonable layout of village land to optimize the rural landscape.