| In dint of GIS and mathematical model, this paper studied on the farmland protected zones in Minhou county, has evalueted the value of cultivated land.Then in dint of mathematical model,using the improved results of the cropland grade evaluation,this paper has discussed the connection between the farmland grade and the farmland value and set up the farmland grade value.According to the principle of keeping the balance of farmland quantity and value,using the grade value and the utilization grade index of farmland,this paper has respectively discussed the calculate method of the valuation-grade conversion coefficient of regional cropland,set up the valuation-grade conversion coefficient system,which has provided scientific management gists for the quantity-quality-valuation balance of regional cropland requisition and compensation.The results was following:1. The per hectare economic value in Minhou had obvious differences,and so with the social capacity value and ecological service value. The per hectare economic value changed from 226.1 thousand/hm2 to 961.1 thousand/hm2,the average value was 506.3 thousand/hm2. The per hectare economic value showing that it was high in southeast and it was low in southwest and north of Minhou.The per hectare social capacity value changed from 958.7 thousand/hm2 to 2072.2 thousand/hm2,the average value was1294.1 thousand/hm2. The per hectare social capacity value showing that it was high in south and it was low in north of Minhou. The per hectare ecological service value changed from 1359.3 thousand/hm2 to 3402.6 thousand/hm2,the average value was2141.3 thousand/hm2. The per hectare ecological service value showing that it was high in southeast and it was low in southwest and north of Minhou.The average value of the per hectare economic value, the per hectare social capacity value and the per hectare ecological service value respectively accounting for 23.27%,61.06%,15.67%.It showed that the social capacity function and the ecological sercice function of the farmland should not be ignored.2.The total economic value among the fifting towns changed from 46949.6 thousand to 1640696.2 thousand,and the total economic value in Minhou was 12509 million;the total social capacity value in Minhou was 31972 million,and it changed from 111366.8 thousand to 4364416 thousand among all the towns;the total ecological service value in Minhou was 8421 million, it ranged from 27318.5 thousand to 1099447.1 thousand among all the town;the total value of the farmland in Minhou was 52902 million,it ranged from 186125.1 thousand to 6300801.6 thousand among all the towns,the trendency of the total farmland value of each town was Shanggan<Shangjie<Ganzhe<Xiaoruo<Xiangqian<Qingkou<Nanyu<Nantong<Zhuqi<Jingxi<Tingping<Yangli<Hongwei<Baisha<Dahu.3.In Minhou nine grades total value was respectively 3822.0thousand/hm2,3488.5thousand/hm2,3094.1 thousand/hm2,2715.7 thousand/hm2,2236.5thousand/hm2,2059.3 thousand/hm2,1740.3thousand/hm2,1528.8thousand/hm2,1142.9thousand/hm2.The I, II and III grades of the total value of farmland area was4260.62hm2,accounting for17.25% of the total area of cropland in Minhou county farmland protected zones.The IV, V and VI grades of the total value of farmland area was 8385.10hm2,accounting for 33.94% of the total area of cropland in Minhou county farmland protected zones. The lowestⅦ,ⅧandⅨgrades of the total value of farmland area was12064.70 hm2,accounting for 48.83% of the total area of cropland in Minhou county farmland protected zones. Most farmland value was between the medium-grade and the low-grade, which was consistent with the quality of the farmland.Most area of the highest grades value of farmland located in the south of Minhou,the main area of the medium grades value of farmland located in the middle of Minhou,and a lot of low grades value of farmland area was in the north and southwest of Minhou.4.The valuation-grade conversion coefficient of regional cropland ,which was based on the grade value of farmland show that when used the higher grade compensated for the lower grade the converted coefficients of cropland was minimum,accounting for zero.The highest and lowest valuation-grade conversion coefficient of regional cropland was maximum, accounting for 2679.1 thousand/hm2,that means you should not only compensate the same number area of cropland as the occupied,but also compensate 2679.1 thousand/hm2.For the region that has not evaluated the grade value, this paper has indirected set up the valuation-grade conversion coefficient with the help of the connection model among the farmland grade,utilization index and the farmland value.The mathematical model was y=240.05x + 735687(y represented the farmland value,x represented the utilization index). This valuation-grade conversion coefficient of regional cropland show that when used the higher grade compensated for the lower grade the converted coefficients of cropland was minimum,accounting for zero.The highest and lowest valuation-grade conversion coefficient of regional cropland was maximum, accounting for 2665.0 thousand/hm2,that means you should not only compensate the same number area of cropland as the occupied,but also compensate 2665.0 thousand/hm2. The result variety trend was the same as the valuation-grade conversion coefficient that based on the farmland grade value.The valuation-grade conversion coefficient of regional cropland increased with the farmland grades gap.This kind of variety trend was consistent with the the designated crop potential productivity. The valuation-grade conversion coefficient of regional cropland reflected the real content of requisition-compensation balance of cultivited land.Keeping balance between farmland occupation and compensation was an important measure to protect the farmland.Based on the evaluation of the farmland quality and value,this paper has set up the valuation-grade conversion coefficient of regional cropland,which conformed to the principle that exchanged the equal value,and made the compensation of farmland value one-way flow.The management of the requisition-compensation balance of cropland has changed from quantities- qualities to quantities-qualities-value balance,which improved the requisition-compensation balance of cropland assessment system,and promoted the requisition-compensation balance of cropland to take effect. |
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