Research Of Soil Erosion On Surface Of The Landscape Pattern Under The Perspective Of Fuzzy Comprehensive Evaluation

Soil erosion is one of the major problems of cultivated land in our country, which is directly related to the cultivated land quality and food production safety. The factors affecting soil erosion mainly include climate, soil, topography, vegetation, hydrology and other factors. The landscape types, composition and function of influence on the regional land use structure, area of land ecosystem change the composition of the structure, function, and become the important factors affecting soil erosion. In the rapid development of economic, social, environment, human activities on the surface structure and spatial distribution of the landscape pattern plays a leading role. Based on the data of landform, surface coverage, and other statistical data, using landscape pattern analysis models and methods, research different elevation with erosion gully density and the correlation of landscape index, from the level of landscape on the analysis of the effect of landscape index of soil erosion; Around two aspects of natural factors and social factors to select evaluation index to construct the landscape pattern of soil erosion under the perspective of fuzzy comprehensive evaluation index system; Using the GIS spatial analysis technology and multi- level fuzzy comprehensive evaluation model to test the surface landscape pattern under the perspective of fuzzy comprehensive evaluation of soil erosion research. Main content is:(1) For most of the selection process based on soil erosion landscape pattern index analysis indicator adopted by the calculation of soil erosion area and erosion limitations, such as use of landscape pattern analysis models and methods, from the perspective of landscape ecology research on regional soil erosion condition. Elevation in the study area landscape belt grading scale as the breakthrough point, using SPSS software to study area erosion gully density and landscape index of main component analysis, studies the correlation between landscape index and erosion gully density, under the perspective of regional landscape pattern of soil erosion status evaluation. Studies have shown that Erosion gully density and patch density and the relationship between the landscape shape index is positive, it is a factor of soil erosion in the study area, mean patch fractal dimension, and gathered, widespread degrees as well as the correlation between the area weighted average patch shape index is negative, suggests that the inhibition of soil erosion in the study area has a certain role.(2) Around two aspects of natural factors and social factors, from the perspective of geographical space to establish the landscape pattern of soil erosion under the perspective of fuzzy comprehensive evaluation index system, using hierarchical analysis software and SPSS statistical software by using principal component analysis of the correlation among the indexes and its relative to the importance of the soil erosion degree, the various indicators of empowerment. Using multi- level fuzzy comprehensive evaluation model, constructing the landscape pattern of the fuzzy comprehensive evaluation of soil erosion under the perspective of subordinate function, calculated according to membership function of the constructed fuzzy relationship matrix, using fuzzy synthesis operators get single fuzzy evaluation matrix, and then according to the single fuzzy evaluation matrix, multi- level fuzzy comprehensive evaluation results are obtained. Uniformization treatment will result, and comparing with evaluation theory of domain of the set, using GIS spatial analysis technology, computing test area surface soil erosion landscape pattern under the perspective of fuzzy comprehensive evaluation results.(3) Select heihe city in heilongjiang province sun wuxian as test area, Study administrative divisions to measure regional soil erosion condition respectively, because regional ecological security assessment with administrative division units for census and statistics are one-sidedness, this paper proposes a gridding fuzzy comprehensive evaluation regional ecological security method. geography situation survey data be used as the main data source in this method, with the grid of 500m×500m as evaluation unit, converting each evaluation index to the same space base with space superposition method based on grid data, getting soil erosion composite index in each grid with a algebraic operation of the map. finally, setting up soil erosion index model, and appraising soil erosion with fuzzy comprehensive evaluation methods. The results show that, in the lower altitude in the northeast plain region in the study area soil erosion more serious condition; in low mountain hills valley, in the critical state soil erosion. For the relatively high altitude region, soil erosion degree is weak. This study for sun wuxian optimize configuration of landscape space and provide a scientific basis for control of soil erosion.