Spatially-explicit Sensitivity Analysis For Land Suitability Evaluation In Xiangning County

Land suitability evaluation is a very important step in land useplanning. Multiple criteria decision making fMCDM) based ongeographic informatioii system technology Is flexible and effective.Through the sensitivity analysis to test and calibrate multiplecirteria decision making, and can deepen the understanding ofSand suitability eva_uatt?n results and help to make reasonedplanning decisions. In this paper, through senstriwity analysis ofthe selected evaluation factors of Sand suitabiSity, spaceconfiguration information is obtained t? fill the lack of theobservation of spatial dimension. The object of sensitivityanalysis includes t宝◎measurementss a traditional measurement《113₆隐1absolute average rate of change,酬具CR》and a new spacevisual measurement （the distance of th? eatrh moving, the EMD）.In this paper, the weight is assumed to be the only source ofuncetrainty, under which, the sensitivity analysis of differentsensitive parameters of MACR and EMD is done to obtain thespace change iiiforniatSon of the ewaluation factors infSuenciiigland suitabiiitf,By the evaSuation of crops, the selection of relevant evaSuation factors and calculation of the weights, linear weighfed summethod is used Co conduce. ICIarigriitig Bsifd suitability evaluation.Xiaiigning’s main ff??d crops-wheat is selected as Hhe evaliiationcrop to do land suitability ewaSuation. Recording to relewasaC data,seven of the wheat suitabiSity evaluation factors are selected toconduct Sand suitability evaluation, whicli are soil texture, soildepth, soil organic matter, Soil pH, altitude, terrain slope andgroundwater depth. Analytic hierarchy process《AHP》Ss used to doweight calculation of seven evaluation factors. Based on theUnited Nations food and agricultural organization system,according to the seven evaluation factors off Xiangning, suitabilityis categorized Sntos high suitability, moderate suitability, marginalsuitability and unsuitabiiity. According to the scores and weightcalculations of seven evaSuation factors, the notrheast and southof Xiangning is highly suitable for planting wheat, aad the notrhand southwest of Xiangniiig Ss unsuitable f@r planting wheat. Themain iimitiiig factors are mountain soil texture, low sell organicmatter and soil water shotrage.According to MACR and E₀9sensitivity analysis of landsuitability evaluation factors is done? According to MACR, thecomprehensive value ranking of evaSuation factors is as follows:soil depth>soiI texture>soii organic matter> alt_tude>ground_ate『depth>terraiii slope>Soil pH.According to EMD, comprehensivevalue ranking of ewaliiation factors Ss as foilowss soil organiciftaffer> altitude> soil texture> soil depth> groundwater depth>terrain slope>Soil pH. Those two comprehensive value rankingsare different, because weight change Is relative and patrial sensitive.Recording to the sensitivity analysis off ilangning land spaceby iiAeH anci EHESj《’Eie fact that multiple criteria decision niakingis applicable in land suitability evaluation is confirmed,^?cordingto tti? research, through the analysis of MACR, the SnformatioEi@ffnuitiericai change is obtained, while through the analysis of E_D,the information off space change is obtained. Results show that,through the analysis of MACR, the overall value of wheat landsuitability evaluation is relatively stable. But the spatialvisualization of land suitability evaluation obtained by EMD showsthat weight change in local area is relatiwely sensitive. Weightchange causes the change of MACR andsensitive evaluation factors of Xiangning Band suitabiSityevaiuation are inferred to be soil organic matter and soil depthsThe t警? evaiuation factors reflect different information of thesensitivitf of land suitabilSt^T? sum up, EKB largely reflects thespatial variation of land suitabiSity evaSuation factors. When theland suitability evaluation Ss conducted, to strengthen the analysisof EMD is advantageous to theami SEistainaiile utiiizatioiiof Xiangning land resources.