Study On The Para Position Allocation Model Of Soil And Water Conservation Measures In Hilly-gully Region Of Tableland On Gansu Province

They composed by the gully&plateau landform unit in Hilly-gully Region of Tablelandon Gansu,due to the strong water&gravitational erosion,the plateau fertile farmland isthreatened faster by plateau surface,erosion channel expansion and ditch cut.Therefore,"solidditch&protect plateau"has played a crucial role.for ecological regions、economic and socialdevelopment.selected Nanxiaohegou typical small watershed as experiments in Hilly-gullyRegion of Tableland on Gansu Province analysised the slope ditch system water and sedimentsources,channel grading and classification of basic research to find out the basic situation ofthe erosion of the channel,for soil and water conservation measures on the status of thechannel model and bit configuration modes are summarized and presented research on soiland water conservation district erosion channel para position allocation model,provide ascientific basis for the area "solid ditch&protect plateau",for promote the economicdevelopment of small watershed ecology of important guiding significance.The main conclusions are in the following:(1)Studies have shown that slope is a major source of parts runoff,the channel is the mainsource of sediment basin in watershed;with the slope improvement in the level ofgovernance,the ability of sediment yield decreased in small watershed.(2)Used the classification methods of Hortun-Strahler with geometric landscapesquantitative mathematical,selected greater than or equal500m for Gullied.Explored Gulliedchannel classification method Gansu Province,depended on the degree of opening, the degreeof fragmentation and the main tributary status indicators，based on the channel Classification，Conducted scientific classification,determine the actual existence of the main types of channeltypes and different levels of channel.(3)Through field investigation of water conservation measures and the number of majorplant species in Gullied channel typical small watershed,summarizes the different levelschannels of success governance.(4)Study on the para position allocation model of soil and water conservationmeasures,based on the channel, aspect, slope, soil type, etc. as key indicators in Plateau GullyRegion small watershed,divided10kinds of site conditions in small watershed withchannel,Suitability through bit of resource (site conditions) and niche (ecological conditionsrequired for plant species) is calculated，proposed the Channel management measures plant inpara position allocation model;through soil and water conservation specificationsrequirements for geology, soil and other in measures engineering then combined with fieldconditions,proposed gullied different levels and different types of channel managementproject measures with the para position allocation model in Hilly-gully Region of Tableland.