The Status And Spatial Distribution Of Soil Nutrient In Alar Reclamation Area

[Object] Soil nutrient status is an important basis for evaluating the soil fertility and cultivated land fertility evaluation. The soil nutrient status was investigated in cultivated land of Alar Reclamation Area. The objective of this study was to analysis the change trend of soil nutrient of cultivated land and to clarify the spatial distribution characteristics of soil nutrients in Alar Reclamation Area. Those could provide a theoretical basis for the construction of high standard farmland and reasonable fertilization.[Method] Soil nutrients in cultivated land of Alar Reclamation area were sampled and analyzed in20112012. Soil nutrient contents of historical data from1983to2006in Alar Reclamation Area were also gathered. The soil nutrient status and evolution trend in Alar Irrigated Area was studed using the traditional statistical methods. The correlation relativity and variability between different soil nutrients were analysised to demontrate the distribution characteristics of soil nutrients in Alar Reclamation area.[Result](1) The average content of the organic matter was9.25g kg-1and belonged to the fourth level. The average contents of the available N, available P, and available K in soil were103,22.7and152mg kg-1, and belonged to the third level, second level and second level, respectively. The average salt content of soil was4.07g kg-1and belonged to mild salinization. The average contents of the available Cu, available Zn, and available B in soil were1.59,1.12, and1.84mg kg-1, and belonged to the second level. The average contents of the available Fe and available Mn in soil were20.16and3.65mg kg-1, and belonged to the first level and fourth level, respectively.(2) From1983to2012, the contents of salt, organic matter, and available K in soil showed decreasing trend, but the contents of available N and available P showed rising trend. The content of available Zn in soil was low to moderate and showed increasing trend with Zn fertilizer supplement. Available Cu, Fe, Mn. And B contents were rich, but the available Mn content decreased.(3) The order of of each relative coefficient between different soil nutrients in Alar Reclamation area was available N> available k> available P> organic matter. The variation coefficient order of trace element nutrient was available Zn> available Fe> available Cu> available Mn> available B. The variation coefficient of salt was the largest and reaching84.98%. The variability coefficient of soil organic matter, available phosphorus, zinc, and iron were higher in2012than those in1983, but the variability coefficient of soil available N, P, Cu, Mn, and B decreased.(4) There was no significant correlation between the crop yield and soil nutrient content. Cotton yield in the newly reclaimed land was significantly higher than that in the cultivated land.(5) The cultivated land fertility of Alar Reclamation Area was divided into six grades. The area of first grade and second grade is10302hm2, accounting for15.56%of the total cultivated land. The area of third grade is13782hm2, accounting for20.23%. The fourth grade of cultivated land area is18216hm, accounting for26.73%. The fifth grade of arable land area is13493hm2, accounting for19.80%. The sixth grade cultivated land area is12047hm2, accounting for17.68%.(6) The cultivated land fertility distribution among different production units was significant different in Alar Reclamation Area. The first grade cultivated land was mainly distributed in the7th regiment and Tuokayi town and the area of cultivated land with the third grade or above accounted for more than60%. The area of cultivated land with the fourth grade or below accounted for more than60%accounted for more than75%of arable land in the11th regiment,13th regiment,14th regiment, Tashui department, and Shuigong department.