Calculating Method For Newly Increased Cultivated Land Area In Land Exploitation And Consolidation

In the current land use of China, arable land is decreasing year after year, and man-land contradiction has become increasingly acute, farmland quality and reserve resources are increasingly decreasing; small scale and low utilization rate of land can not meet the requirements of agricultural and rural modernization; too much attrntion is paid the on balance of quantity, so quality balance of arable land cann not be achieved; the total scale of construction land is too large, and the expansion trend is difficult to be effectively controlled, disorderly and extensive land use is more pronounced; urban-rural dual structure of land use has become prominent,and regional land use layout is unreasonable;land degradation, destruction are severe in some places,and ecological environment is deteriorating, ect.To achieve dynamic equilibrium of the total amount of cultivated land, our country has carried out the work of the national investment in land development since 2001. and as is granted,40 billion new construction land use fees has been used to pay the implementation of 3054 national investment land development projects, besides,the goal of 451,700 hm2 new increased land was proposed.This figer is a total of the forecasted number of all the plaaning land development projects.However,there is still not an unified approach to caculate the quantity of new increased land.It differs a lot in different places. Fraud even exists in someplace.All these put the goal of achieving dynamic equilibrium of the total amount of cultivated land in an embarrassing consituation.So,to fill the blanks of methods to caculate the the new increased land in land development projects, a scientific, reasonable, feasible and economical approch system should be established.The establishment of this system will help a lot to assess the results of land development and to achieve the dynamic balance of cultivated land amount.There are a few methods to caculate the area of new increased land,such as arable land consolidation coefficient method, integrated balance method, land-used-by-infrastructure mthod, measurement method, a typical sampling method,ect.However,these methods are just suitable for land development projects in some special places,it's their limitation. China has not yet stipulte which method should be used under which cosituation.and the new increased land area in planning-design phase and the area after the completion are not compared. Therefore, it is difficult to master whether the land development projects achieve the area of new increased land,and it is hard to measure the actual completion of objectives or goals. By comparision and analysis of existing additional land measurement methods, and on the basis of land-used-by-infrastructure method and typical sampling method,this paper,which seeks to ensure theoretical feasibility and science of the method, proposes to use improved sampling method for a typical place to estimate the new cultivated land. And the land development project of 3 villages,which named xiangtanzi (ect.),at ShuangShi Town, Yongchuan District, Chongqing City was taken as an example to test the feasability operability in economics.Therefore.the defects of the existing measurement method can be corrected,and the theoretical level and practical combination in caculating the area of new increased cultivated landin land consolidation projects can be ensured.According to the Calculation of land readjustment project before the implementation of the additional land area:33.84hm2, with a typical sampling method to calculate the additional land after the project area:32.78hm2 comparison, a difference of 1.06hm2. Difference is due to land consolidation coefficient calculation principle has the advantage of clear and easy process, but the process and results can not be combined with the graphics attribute information, the results are quite random error and the inevitable errors, such as net factor ridge after finishing Statistics and experience in acquisition, can not fully consistent with all the items; sometimes not enough as the number of statistical analysis led to errors. When the nature of the project for land development or land reclamation, the calculation method of the error is small, the advantages of simple operation. As the land consolidation projects and integrated projects added complexity of land area measurement, the process involves a number of multiply and add, according to the law of error propagation shows that the error is cumulative benefits.Under the overall balance method to calculate the additional land before the project area:29.78hm2, with a typical sampling method the additional land after the project area: 32.78hm2 comparison, a difference of 3hm2. Difference because this method can partly reflect the change in relationship between land type, and map Jie He reflects in part, class changes, such as the increase in cultivated land with the red, said sources, said the reduction of arable land with the blue part. However, due to the limitations of graphic scale, part of the linear features new arable land can not be displayed on the graph. Meanwhile, the lack of new arable land estimates detailed calculation process, sometimes inaccurate phenomena, such as deliberately increase the amount of cultivated land from the linear surface features and to minimize the class size to confirm the stone threshold, ditches and roads, the area of land occupied by and so on. According to the Calculation of the infrastructure project sites before the implementation of the additional land area:33.90hm2, with a typical sampling method to calculate the additional land after the project area:32.78hm2 comparison, a difference of 1.12hm2. Difference is due to the technical requirements of the method is relatively high, the operation works is relatively complex, suitable for hilly areas. Jichu Sites coefficient calculation process in detail, calculated data from the construction or completion Accepting Survey Huoqu, calculated results and the project implementation of projects linked closely together, can land consolidation project newly added tillage areas into the project acceptance system so that Tu documents and data more organic integration of the road can not be represented in Figure parts, ditches and other linear surface features can be reflected from the measurement process.Measurement method according to the project before the implementation of the additional land area:34.37hm2, with a typical sampling method to calculate the additional land after the project area:32.78hm2 comparison, a difference of 1.59hm2. Reason for the difference is that the method is relatively high technical requirements of foreign trade, the operation works is relatively complex, more diverse sources of error.Typical sampling method according to the project before the implementation of the additional land area:41.41hm2, with a typical sampling method to calculate the additional land after the project area:32.78hm2 comparison, a difference of 8.63hm2. Reason for the difference is that the method exists in the sample if the human factor, it will reduce the accuracy of the results of new arable land estimates. Through the above analysis we can draw lessons to improve infrastructure, land use law in typical sampling and infrastructure advantages of land law, considering the hilly area of landscape features, the detailed calculation process, with strong feasibility and maneuverability, good hills Land consolidation projects added measure of arable land. Typical sampling party for the most extensive region, but usually in combination with other methods used together.