| Cultivated land is the foundation of agricultural development and the foundation of farmers to settle down.Crop rotation and fallow of cultivated land is one of the measures in favor of cultivated land recuperation under the current situation of land degradation and lack of fertility.This paper studies the pilot area of cultivated land rotation and fallow in Hulunbuir city,using the ARCGIS software and statistical software,using the layer analysis method and fuzzy integrated evaluation method,and who is based on ARCGIS spatial interpolation technology,and the paper is first to evaluate the farmland productivity of pilot area to analyze the suitability of farmlands,secondly is to describe and analyze the soil nutrient changes in pilot area during the rotation,and finally is to put forward the countermeasures and Suggestions to improve the quality of cultivated land according to the situation on the spot.The main results are as follows:(1)In the evaluation of cultivated land fertility,the rotation and fallow area of cultivated land in Hulunbuir city was selected as the evaluation unit;12 indexes including effective accumulated temperature ≥ 10℃,frost-free period,geomorphic type,altitude,slope,available soil layer thickness,texture,organic matter,pH value,Olsen-P,Olsen-K and availability zn were selected as index factors;Finally,it is determined that the cultivated land capacity is divided into five grades,among which the first-grade land takes up 10.10%,the second-grade land 17.55%,the third-grade land 27.74%,the fourth-grade land 37.65%and the fifth-grade land 6.96%.(2)In terms of the suitability evaluation of cultivated land rotation and fallow,the suitability results were divided into three grades:the IFI difference between-0.11-0 was considered as inappropriate rotation area,accounting for 2.66%of the total area of the study area;IFI difference between 0.08-0.21 was the most suitable area for crop rotation,accounting for 9.23%of the total area of the study area.IFI difference between 0-0.08 is suitable for crop rotation,accounting for 88.11%of the total area of the study area.It can be seen that most of the study areas are suitable for rotation.(3)In the soil nutrient changes in pilot area during the rotation,the coefficient of variation of soil pH,content of organic matter,total nitrogen content,effective phosphorus content,available potassium content are moderate in the pilot area of cultivated land rotation and fallow of Hulunbuir city,and the human disturbance factors of the cultivated land rotation and fallow mode were weak,and is more in line with the natural growth and more conducive to the rest of the cultivated land.After rotation,pH value and organic matter content of soil increased,while total nitrogen,available phosphorus and available potassium decreased.(4)Rotation and fallow mode in pilot areas is not only conducive to the rest and sustainable use of cultivated land,but also can increase farmers’ income to a certain extent.In terms of ecology,it is also conducive to the self-circulation and coordination of the ecosystem. |
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