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To effectively carry out soil and water conservation work and monitor soil erosion in Fujian Province, southeast of China, Universal Soil Loss Equation (USLE) model has been adopted. Landsat8 OLI images, combined with topographical data, soil data and rainfall data were used. Then the soil erosion modulus of Fujian Province was calculated quantitatively based on USLE and classified into different...
China's Grain for Green Programme (GGP) is the largest ecological restoration programme ever implemented in a developing country, but the ecological effectiveness in its whole implementation region still remain uncertain. Based on the trend analysis of dynamics in ecosystem structure and service, we assessed the ecological effects before and after the implementation of the GGP in 1990–2010 by developing...
The domestic and foreign research on the water level change of the channel scheduling involves many aspects at present. The water level fluctuation has an imortant influence on slope stability. In the process of water level fluctuation, the change of soil state from unsaturated to saturated and other problems which should be taken into account in the analysis of slope stability. A typical slope in...
Meaningful conservation practices on upper Midwest grain farms cannot be effective without robust networks of farmer operators, landowners, advocacy groups, and conservation officials working together. These communication networks, which are currently weak or non-existent, require willing actors employing technical expertise to improve water quality by growing cover crops in Iowa. Technical communicators...
Based on the model of Chinese soil loss equation (CSLE), this paper puts forward a model to calculate the large scale data automatically. At present, the domestic use of this model to calculate the soil loss modulus methods are mostly used in the existing calculation tools, manual calculation of a basin or county soil erosion modulus. However, the data collected from the first national water resources...
Crop water requirement is very important for water cycle and is a determinant factor for the accurate estimation of water and heat flux in the Soil-Plant-Atmosphere Continuum (SPAC). In arid regions, quantitative estimation of crop water requirement is the base of appraising terrestrial NPP, regional water consumption, soil water transport, crop production, and land use under changing climate. In...
Soil erosion is one of the thorniest issues which has brought severe environmental problems such as degradation of water quality and soil productivity. Topographic factor, as known as slope length and steepness factor (LS) plays a vital role in soil erosion model, it is multiplied with rainfall erosivity (R), ground cover (C), soil erodibility (K) and soil conservation practices factor (P) to modelling...
The Loess Plateau is a region where soil erosion is the most serious in our country. In order to obtain the damage that caused by soil erosion in the ecosystem of Loess Plateau, we set up analytical factors from three aspects of natural factors, human factors and soil erosion factors. Based on factor analysis algorithm, we analyse the three important factors. The weighted values and estimated values...
Retaining water at the root level of crops has been a major focus in precision irrigation system from technological, societal, and environmental points of view. Subsurface water retention technology (SWRT) through impermeable membranes placed at certain depths under has shown 1.4 to 3.4-fold increase in production in crops. However, the sizing, placement and surface water scheduling are important...
Soil erosion is serious at present in China, so studying on the assessment methods of soil erosion intensity is significant for soil and water conservation planning and implementation. Take the Ten Tributaries upstream as an example. Based on remote sensing and GWAS technology, soil erosion intensity was calculated and comparatively analyzed using two methods of "soil erosion classification and...
Terrestrial ecosystem has important ecological function and ecological services value. Soil conservation is one of the important ecological service functions of ecosystem, which is benefit for improve ecological environment and realize economy sustainable development. The soil conservation functions of ecosystem mainly include maintaining soil fertility, reducing waterway silt-up and protecting topsoil...
The relief amplitude is an important indicator in digital geomorphologic mapping, the evaluation of soil erosion sensitivity. Based on the DEM data (100m resolution), the relief amplitude of Qinghai was calculated by spatial statistical tool of GIS. By using the method of window analysis and the mean of change-point, the optimum statistical unitand relief amplitude of Qinghai Province was calculated...
This paper collected attribute data of affecting soil erosion factor by RS and GIS, combined soil erosion model, got the load and density of soil erosion in Luoning County, and analyzed the relationship between soil erosion and its main affecting factors. The results indicated that soil erosion modulus was 2799.29t/km2 and erosion load 6495744t, 61% of Luoning County had tiny or light degree erosion,...
Gully erosion of tillage land in northeast China cause mass land degradation and threaten the safety of grain production of China. The relationship between the spatial distribution of gullies and topographic factors, such as slope angle, aspect, slope form, SPI and TWI, as well as land use and lithology are discussed in the Keshan County of Heilongjiang province. The topographic factors are derived...
Traditional storm water management practices have historically been designed around a drainage system's ability to quickly convey a storm's peak flow by using detention structures to detain and release runoff at rates that did not exceed predevelopment peak flow rates. Within such practices downstream property is supposed to be protected from storm water flooding by controlling the rate of runoff...
Soil erosion causes the loss of soil resources, the degradation of land fertility and the deterioration of regional ecological environment. Supported by the Geographical Information System (GIS), this paper takes Changting County in Fujian Province as an example. According to the intensity status quo of soil erosion, and on the statistical basis of the demarcation of the erodibility hazard rating,...
Contour hedgerow can efficiently improve soil structure and its ecological performance, retain soil nutrients and prevent non-point pollutants in sloping land. Effects of Leucaena Leucocephala hedgerow on the physical properties in 0-20 cm and 20-40 cm soil layer were evaluated under two kinds of land utilization patterns in 1.471%, 1.504% plots on sloping land in the purple soil area. Results indicate...
Sensitivity of soil erosion is the representative of the possibility of occurring soil erosion under natural conditions. Sensitivity evaluation of soil erosion is the reliable method to identify the highly sensitivity areas and evaluate the sensitivity degree in a particular area. This paper uses the revised universal soil loss equation (RUSLE) and GIS technique which has powerful space analysis functions...
With the rapid development of highway construction in China, the arid area of northwest China is one of the areas that w ill be exploited during the massive development of west china, especially with highway construction. But the water environment in this area have been over used for a long time due to highway construction. This paper on the analysis of the ecological loss of water environment of...
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