Evaluation Of Cultivated Land Fertility And The Major Soil Nutrient Characteristics In Lingling District

Cultivated land is the most important resources for people access to food and other agricultural products, and the man means of production for people survival, and an important material basis for sustainable development of agriculture. In this study, according to the multiple information (land use maps, soil type maps and administrative maps), the cultivated land fertility was evaluated and the major topsoil nutrient characteristics was analyzed by the methods of soil sampling, AHP and GIS spatial analysis. It was studied to improve the level of management and maintenance of arable farmland resource efficiency, promote sustainable agricultural development of Lingling District. The results were showed as foil owing.(1) The total area of cultivated land in Lingling District is 36112.47 hm2, where the primary land area of 4588.40 hm2, accounting for 12.71%of the total area of cultivated land; the second land is5328.87 hm2, accounting for 14.76%; the third land is 4452.13 hm2, accounting for 12.33%; the fourth land is 5071.20 hm2, accounting for 14.04%; the fifth land is 4517.20 hm2, accounting for 12.51%; the sixth land is 9778.73 hm2, accounting for 27.08%; the seventh land is 2375.93 hm2, accounting for 6.58%.The sixth land is the largest share of the total cultivated area, followed by the second land and the fourth land, the seventh land is the lowest.(2) The high yielding land in Lingling District is 9917.27 hm2, accounting for 27.47% of the total area of cultivated land; the middle yielding land is 14040.53 hm2, accounting for 38.88%; the low-yield land is 12154.67 hm2, accounting for 33.66%. There are large quantity of the middle yielding land and low-yield land in Lingling District, The high yielding land and the middle yielding land of Youtingxu Town is the largest, respectively 1671.47 hm2 and 1824.4 hm2. The middle yielding land of Zhushan Town is the largest, which is 1673.80 hm2.(3) The organic matter in topsoil of cultivated land in Lingling district has high spatial variability. TheQilidian Street is the highest, followed by the Dangdi Country, Lingjiaotang Town and Jielvqiao Town. The topsoil organic matter of different soil types is between 19.33?40.37 g/kg. Compared to the second soil survey data, the average of organic matter of cultivated land in Lingling District have improved.(4) Shiyantou Town is the highest of the total nitrogen in topsoil of cultivated land in Lingling District, followed by the Lingjiaotang Town, Zhushan Town and Chaoyang Street, only is 2.37 g/kg. The total nitrogen went down as follow:Purple soil> Red soils> Paddy soils> Black calcareous soil> Red calcareous soil> Fluvo-aquic soils. Compared to the second soil survey data, the average of total nitrogen of cultivated land in Lingling District have improved.(5) The available phosphorus in topsoil of cultivated land in Lingling District has high spatial variability. The available phosphorus was significant differences in the proportion of the distribution area of the town. The available phosphorus is between 3.25?49.73 mg/kg in topsoil of cultivated land in Lingling District. Paddy soil of the available phosphorus in topsoil of cultivated land is lower than the dry farmland. Compared to the second soil survey data, the average of the available phosphorus of cultivated land in Lingling District have improved.(6) The avail able potassium in topsoil of cultivated land in Lingling District is at a low level. The total nitrogen went down as follow:Black calcareous soil> Red calcareous soil> Paddy soils> Purple soil> Red soils> Fluvo-aquic soils. Compared to the second soil survey data, the average of the available phosphorus of cultivated land in Lingling District have improved.