Journal of Geo-information Science >
Demarcating of Permanent Prime Farmland for Synergy of Farmland Protection and Urban Expansion: A Case Study of Wuhan
Received date: 2019-07-31
Request revised date: 2019-12-10
Online published: 2020-05-18
Supported by
National Natural Science Foundation of China(41371113)
Science Foundation of Ministry of Education of China(18JHQ081)
China Postdoctoral Science Foundation(2015M572173)
Fundamental Research Funds for the Central Universities(2662017PY063)
Copyright
Demarcating permanent prime farmland is an effective way to realize farmland protection, intensive land use and food security. With the challenging of rapid urban expansion, the completion between urban expansion and farmland protection is unavoidable. It is urgent to reasonably demarcating permanent prime farmland by synergizing farmland protection and urban expansion. In view of this conflict, taking Wuhan as an example, this paper carries out the demarcation of permanent prime farmland by using LESA (Land Evaluation and Site Assessment) method and LANDSCAPE ( LAND System Cellular Automata model for Potential Effects) model, attempting to achieve balanced development of urban expansion and farmland protection, which provides reference for scientific demarcation of permanent prime farmland under the background of multiplanning integration, and provides support for prime farmland protection and optimizing of land allocation. Firstly, comprehensive evaluation and classification of farmland in Wuhan is carried out through LESA, then based on this result, simulation of demarcation of permanent prime farmland and urban expansion is carried out through LANDSCAPE model, at last, the results of the two methods are compared in quantity, quality and spatial patterns. The results show that permanent prime farmlands demarcated in two methods have little difference in quantity and quality. The area of permanent prime farmland demarcated by LESA method is 243 259 hm 2, 45.63% of which land fertility grade of cultivated land is between grade 1 and grade 3. The area of permanent prime farmland demarcated by LANDSCAPE model is 243 200 hm 2, 45.77% of which land fertility grade of cultivated land is between grade 1 and grade 3. There are more than 80% of the permanent prime farmland that land fertility grade is between grade 1 and grade 5 in both methods, which shows that the total quality of permanent prime farmland is good in either method. However, the result of LANDSCAPE model is better in spatial patterns, which permanent prime farmland demarcated by LANDSCAPE model distributes concentrated and is regular in shape. It's remarkable that 15.8% of permanent prime farmlands demarcated by LESA are overlapped by urban constructive land in the processing of urban expansion, which has been effectively avoided by LANDSCAPE model. The possible cause of this conflict are as follows: (1) The permanent prime farmland demarcated by LESA method is based on ranking of integrated score, in which the requirements for concentrated fragmentation and shape index of permanent prime farmland are not considered; (2) The conflict of farmland protection and urban expansion is not considered in LESA method.
HUANG Hui , KE Xinli . Demarcating of Permanent Prime Farmland for Synergy of Farmland Protection and Urban Expansion: A Case Study of Wuhan[J]. Journal of Geo-information Science, 2020 , 22(3) : 592 -604 . DOI: 10.12082/dqxxkx.2020.190414
表1 武汉市耕地划入永久基本农田的指标、赋值方法及权重Tab. 1 Indexes, assessment methods and weights of permanent prime farmland demarcation in Wuhan City |
LESA体系 | 一级指标 | 二级指标 | 指标赋值标准 | 权重 | ||||
---|---|---|---|---|---|---|---|---|
100 | 80 | 60 | 40 | 20 | ||||
耕地质量(LE) | 土壤条件 | 有机质含量 | 27.10~30.79 | 24.90~27.1 | 23.00~24.90 | 20.90~23.00 | 16.70~20.90 | 0.19 |
表层质地 | 壤土 | 粘壤土 | 粘土 | 砂土 | 0.15 | |||
pH值 | 6.5~7.5 | 5.5~6.5 7.5~8.0 | 5.0~5.5 | 4.5~5.0 | 0.11 | |||
地形条件 | 坡度 | <2 | 2~10 | 10~25 | ≥25 | 0.12 | ||
高程 | <31.19 | 31.19~47.69 | 47.69~76.57 | 76.57~161.15 | >161.15 | 0.08 | ||
基础设施条件 | 灌溉条件 | 充分满足 | 基本满足 | 不满足 | 0.20 | |||
排水条件 | 充分满足 | 基本满足 | 不满足 | 0.15 | ||||
立地条件(SA) | 区位条件 | 到主干道距离/km | ≤0.5 | 0.5~1.0 | 1.0~1.5 | 1.5~2.0 | >2.0 | 0.19 |
到水源距离/km | ≤0.5 | 0.5~1.0 | 1.0~1.5 | 1.5~2.0 | >2.0 | 0.18 | ||
到居民点距离/km | ≤0.2 | 0.2~0.5 | 0.5~0.8 | 0.8~1.2 | >1.2 | 0.23 | ||
空间形态 | 连片度 | P=100(Si-Smin)/(Smax-Smin) | 0.16 | |||||
形状指数 | E=100(Ei-Emin)/(Emax-Emin) | 0.24 |
表2 武汉市耕地LESA综合分值统计及分级Tab. 2 LESA comprehensive score statistics and classification of farmland in Wuhan |
耕地等级 | LESA综合分值/分 | 耕地面积/km2 | 比例/% |
---|---|---|---|
I | >75 | 278.40 | 5.45 |
II | 65~75 | 1699.32 | 33.29 |
III | 55~65 | 2161.47 | 42.35 |
IV | 45~55 | 874.77 | 17.14 |
V | <45 | 90.16 | 1.77 |
图5 武汉市永久基本农田划定基础Fig. 5 Basic map for permanent prime farmland demarcation in Wuhan |
图6 基于LANDSCAPE的武汉市永久基本农田Fig. 6 Permanent prime farmland demarcation in Wuhan based on LANDSCAPE model |
表3 武汉市永久基本农田划定模拟结果Tab. 3 Results of permanent prime farmland demarcation simulation in Wuhan (hm2) |
地类 | 一般耕地 | 林地 | 草地 | 河流 | 湿地 | 城镇建设用地 | 农村建设用地 | 未利用地 | 永久基本农田 |
---|---|---|---|---|---|---|---|---|---|
面积 | 197 509 | 70 359 | 4995 | 28 472 | 129 843 | 160 000 | 21 252 | 256 | 243 200 |
城市扩张占用面积 | 19 372 | 6873 | 2928 | 0 | 26 373 | - | 4 181 | 344 | 0 |
新划入的永久基本农田面积 | 215 360 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | - |
表4 2种方法划定的永久基本农田耕地地力等级对比Tab. 4 Comparison of quality grade of permanent prime farmland demarcated based on two methods |
县域耕地地力等级 | LESA方法划定 | LANDSCAPE方法划定 | |||
---|---|---|---|---|---|
农田面积/hm2 | 比例/% | 农田面积/hm2 | 比例/% | ||
1 | 46 515 | 22.67 | 45 157 | 22.58 | |
2 | 21 464 | 10.46 | 21 189 | 10.59 | |
3 | 25 622 | 12.49 | 25 194 | 12.60 | |
4 | 40 367 | 19.68 | 36 453 | 18.22 | |
5 | 35 544 | 17.33 | 34 483 | 17.24 |
表5 2种方法划定的永久基本农田景观指数对比Tab. 5 Comparison of landscape index of permanent prime farmland demarcated based on two methods |
永久基本农田划分方法 | 斑块数量/个 | 平均斑块面积/hm2 | 破碎度 | 平均斑块分维数 | 面积加权平均形状因子 |
---|---|---|---|---|---|
LESA | 3072 | 156.12 | 1.2566E-06 | 1.2845 | 1.2180 |
LANDSCAPE | 1457 | 317.66 | 5.9885E-07 | 1.2473 | 1.1540 |
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