| Qinghai hilly-gully loess is located in the east of qinghai province,because of the unique of the form and the high rainfall erosion force andhigh intensity agricultural and human activities, hilly-gully loessplateau is the most serious soil and water loss areas in the world, thespecial geographical position and the unique natural environment theecosystem is an important strategic position, the region the stand or fallof soil and water conservation is not only related to the development ofitself, but also related to the middle and lower reaches of the Yangtzeriver and the Yellow River of sustainable development and thelong-term development of the Chinese nation. Soil erosion intensity isall the work of soil and water conservation monitoring and based on theregional soil erosion monitoring work, which can timely and accurategrasp regional soil and water loss situation, dynamic and relatedinformation, to control soil and water loss, formulating regional soiland water loss control countermeasure, protect land resources andecological environment has a very important significance.This paper using in situ monitoring and macro monitoring themethod of combining select erosion gully and rolling loess region ofQinghai province for monitoring. In situ monitoring,20naturallyhilly-gully loess was produced in Qinghai province, which not forinterference, in the development stage of article20arranged erosiongully erosion gully monitoring samples and soil erosion monitoring in, the vegetation, soil bulk density, soil porosity, slope and the soil cancorrosion K value on the soil erosion modulus influence; Macromonitoring, based on geographic information system (GIS), globalpositioning system (GPS) and remote sensing (RS) technology, based onArcGIS hydrologic module analysis extraction of river watershed ofpingan county and segmentation, and then get watershed stack with eachof the basin to calculation gully density, finally on the basis of the soilerosion rating classification standards, the basin of pingan county soilerosion degree can be judge.The results show that:(1) based on calculated erosion gully densityof18basin and according the classification standard,the soil erosionintensity of the judgement as follows: erosion intensity intense riverbasin is8,9, river basin11,12, river basin17,18river basin;Extremely intense erosion intensity of river basin is1,2,3,4,5,6,7,10,14,15,16; Erosion intensity intense basin is watershed13.(2)20erosion gully soil erosion observation results show that, The resultsshowed that the erosion modulus decreased as the coverage enlarged,and when the coverage was up to70%, the sensitivity that the erosionmodulus respond to the trees went down. Moreover, the erosionmodulus decreased as the porosity of the soil expanded. With theincrease of the K value and the grade of the slop, the value of theerosion modulus tended to go up. The value of the erosion modulusdecreased in the plots of erosion ditches with high coverage year byyear, the value of the erosion modulus kept the same in the plots oferosion ditches with no coverage, and the erosion modulus decreased asthe value of K got depreciated in the plots of erosion ditches with samecoverage.(3) in situ monitoring NO.12and NO.13, erosion gullybelongs to NO.2basin in pingan county, in2010, NO.12erosion gullyerosion degree is extremely, NO.13erosion gully erosion degree isstrong; In2011, NO.12and NO.13, erosion gully erosion gully erosiondegree is strong, and macro monitoring the erosion degree of NO.2basin is very strong, which is coincide with the the results of situmonitoring. |
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