Soil Degradaiton Assessment And Remote Sensing Retrieval Of Typical Ecological Fragile Zone In The Yellow River Delta

Soil is the loose surface on the Earth’s land growing plants, it is an integral part ofterrestrial ecosystems. It provides a variety of resources required to humans, but soildegradation caused by various unreasonable human activities, has been a serious threat to thesustainability of the world’s agricultural development. Study of soil degradation has becomethe common focus of soil science, agronomy, and environmental science at home and abroad.But so far, many theoretical issues and processes related to soil degradation mechanism is notclear, and there are no accepted or uniform soil degradation indicators and quantitativeevaluation methods. Therefore, the establishment of soil degradation index systems and fastand accurate assessment of soil degradation and access to research information has importantacademic value and practical significance.Now variety of physical and chemical indicators of soil has been applied to evaluate thestatus of soil degradation by scholars at home and abroad. However studies of applyingremote sensing inversion on the basis of traditional evaluation soil degradation are relativelyfew. In this study, ecologically fragile areas in Yellow River Delta were evaluated by soildegradation index system composed of soil physical, chemical indicators and the naturalenvironment indicators. Through processing remote sensing image, screening sensitive bandand model forms, remote sensing inversion model of soil degradation was built, and studyarea for soil degradation and dynamic evolution of the system analysis.In this study, GIS and soil degradation index system were combined to evaluate soildegradation in Kenli County, ecologically fragile areas in Yellow River Delta. Soildegradation was graded through a comprehensive index of soil degradation. The resultsshowed that soil degradation in Kenli, area of level one and level two is59111.60hm2,25.48%of the total area; three, four88411.04hm2,38.11%of the total area, and five, six84478.62hm2,36.41%of the total area. Overall, the extent of soil degradation farther awayfrom the ocean is relatively low, but the extent of soil degradation close to the sea is relativelyhigh. It forms trend of the transition from high to low levels of soil degradation from the coastto inland. After the passage of pretreatment, geometric precision correction processing, sensitivebands filtering and bands combination, filtering reflect the sensitive band of soil degradation,spectral band combination of indicators reflecting was used to reflect soil degradation. As aresult, select the most relevant band combination1,2,3with soil degradation index, remotesensing inversion model of soil degradation was established, obtained the most closedinversion results with the results of the evaluation of soil degradation, the fitting result is ideal.Inversion and dynamic analysis the soil degradation of2008,2011, and2013based on theinversion model.The study conducted a comprehensive evaluation of soil degradation in Kenli Countyecologically fragile areas in Yellow River Delta. Remote sensing inversion of soil degradationwas explored based on the evaluation of soil degradation. Proposed the soil degenerationcondition quantitative measure method, and the soil degeneration remote sensing quotainversion method, for the model frail area soil degeneration condition appraisal, the analysisand the monitor management opened the new mentality.