| In order to ensure grain security and ecological security,find out the distribution,quantity and quality of cultivated land in Shuangliu,improve the efficiency of cultivated land use,and better serve the development of modern agriculture.In this study,used the ArcGIS10.2 and County land resources management information system(CLRMIS)V4.0 to divide the evaluation unit of cultivated land fertility,which interseted by the distribution map of soil types,administrative zoning map and land use map.establish the evaluation index system of cultivated land fertility of Shuangliu County,which contained soil management,site conditions,soil nutrient,soil physicochemical properties of soil texture,and then using the cumulative frequency curve method to calculate the integrated fertility index in the county land resources management information system,Shuangliu County Land Geography evaluation results.The main results of this study are as follows:(1)PH value of soil in Shuangliu County was between 5.5-8.5,neutral and weak acid were the majority.The soil nutrient of cultivated land in Shuangliu County were classified,and the organic matter content was in the range of 3.5-56.3g/kg,mainly distributed in extremely short,short,medium,and the lack of rich,very rich in six grades,each grade area accounted for 0.1%,0.7%,17.1%,40.3%,25.5% and 16.3% of the total cultivated area of the county.The total nitrogen content was in the range of 0.28-3.50g/kg,mainly distributed in extremely short,very short,medium,and the lack of rich and very rich in six grades,each grade area accounted for 0.6% 3.1%,8.9%,38.3%,31.2% and 17.9% of the total cultivated area of the county.The content range of alkali hydrolyzable nitrogen was 32-146 mg/kg,mainly distributed in four grades,which were lack,lack,medium and rich,and each grade occupied 2.8%,58.6%,37.1% and 1.5% of the total cultivated land in the whole county.The content range of alkali hydrolyzable nitrogen was 1.5-19.3 g/kg,mainly distributed in six grades,which were extremely short,short,medium,and the lack of rich,very rich in,each grade occupied 1.3%,1.7%,11.6%,19.9%,27.7% and 37.8% of the total cultivated land in the whole county.(2)The interval of available potassium content was 16-238 mg/kg,mainly distributed in six grades,extremely short,short,medium,and the lack of rich and very rich,each grade area accounted for 2.2%,16.4%,54.5%,17.1%,6.7%,3.1% of the total cultivated area of the county.The evaluation results were classified into the national land productivity classification system,and there were five grades in Shuangliu County.The soil of all grades of cultivated land in Shuangliu County included brown purple soil,brown purple mud water,paddy soil,purple alluvial paddy soil,red brown purple soil and red brown purple paddy soil.The grades area of farmland productivity of two,three,four,five and six accounted for 30.88%,30.15%,28.43%,9.33% and 1.21%.(3)Overall,the content of the soil available phosphorus,organic matter and total was in the middle level to lack level in Shuangliu County.And the alkaline hydrolysis nitrogen and available potassium content were in the lack of level,which was one of the factors limiting of the production.We should increase application organic fertilizer,it could increase soil fertility.Although Shuangliu County was rich in water resources,but the utilization rate was low,the overall poor condition of farmland irrigation,water conservancy projects should be. |
PDF Full Text Request