The Evaluation Of Farmland Productivity Research Based On GIS In Jilin Province

Farmland productivity is an important index reflecting the production capacity of cultivated,which directly affects the food security and economic development of our province.At present,some cities and counties in our province have made an evaluation of cultivated land.Due to the scope of study and the difference of the area,the selection of indicators affecting cultivated land and the method are different.It is difficult and unscientific to summarize the evaluation results based on city and county.Therefore,it is imperative to carry out the quality evaluation of cultivated land in our province,which can provide a deeper understanding of the cultivated land,then provide reasonable arrangement of planting structure and scientific fertilization.The data of this study are from the 6169 cultivated land surface soil sampling points of cultivated in Jilin Province of 2010.The soil map,land use map and administrative division map of Jilin Province are superimpo-seed by GIS technology.14 indicators were selected from the six climatic conditions,site conditions,profile traits,physical and chemical properties,nunutrient status and soil management as the evaluation index of cultivated land quality in Jilin Province.The use of the more mature fertility evaluation methods: fuzzy mathematics theory,Delphi,analytic hierarchy process and so on to evaluate the quality of cultivated land in Jilin Province.And the province of nutrient data interpolation,get the nutrition grading map.The evaluation results showed that the proportion of cultivated land in Jilin Province is divided into nine grades,and the proportion of one to nine is 0.58%,3.41%,12.67%,14.73%,11.83%,15.02%,17.28%,20.02% and 4.46% respectively.One to three is the high yield field,mainly distributed in central Jilin Province,Changchun and Siping area,the main types of soil is black soil.Four to six is the middle field,mainly distributed in the western Jilin Province Songliao plain area of Baicheng and Matsubara area,soil type is chernozem mainly.Seven to nine are low-yielding fields,which are distributed in the Baicheng and Matsubara areas of the alluvial plains covered by ridge-shaped sand dunes in western of Jilin Province,and in the eastern mountainous areas of Jilin,Tonghua,Baishan and Yanbian areas.The soil types are sandy and dark brown Soil mainly.And according to the corresponding level of farmland put forward targeted recommendations.Organic matter content is mainly three or four grades,from east to west gradually decreasing trend.The highest average in the east is 41.22 g / kg,the middle is 25.17 g / kg,and the west is 15.82 g / kg.The contents of total nitrogen and nitrogen in the three ecological zones were mainly from the east to the west,and the total nitrogen content was 1.43 g / kg in the east and 1.46 g/ kg in the middle,the lowest in the west is 1.13 g / kg,the nitrogen density is 0.611 kg / m2,0.34 kg / m2 and 0.307 kg / m2.The content of available phosphorus was mainly three or four grades,the average contents of east,middle and west were 29.87 mg / kg,24.94 mg / kg and 21.56 mg / kg respectively.The contents of available potassium in the two,three and four,no one,five and six,the eastern,middle and west of the three ecological zones of the highest available potassium content of the highest 128.05 mg / kg,followed by the western 125.31 mg / kg,the eastern is 125.10 mg / kg.