丘陵山区耕地田块细碎化测度及分类治理策略

    Measurement and classified governance strategies of farmland parcel fragmentation in hilly and mountainous areas

    • 摘要: 耕地细碎化是阻碍农业高质量发展的关键因素之一,如何构建基于田块尺度的耕地细碎化测度体系并采取差异化治理策略对推进耕地细碎化治理具有重要意义。该研究以丘陵山区广东省郁南县河口镇为例,结合问卷调研及高标准农田建设相关政策构建了基于“自然禀赋度-权属分散度-耕作便捷度”的田块尺度细碎化测度指标体系,通过TOPSIS模型测算田块细碎化三维综合指数,引入局部空间自相关探究空间聚集关系,最后通过三维魔方模型并结合管控约束性形成分类整治引导方案。结果表明:1)在自然禀赋度维度,研究区田块综合评价水平在0.219~0.716之间,其中综合评价水平低的田块数量占比为9.24%,水平较低的田块数量占比为23.01%,水平较高的田块数量占比为46.85%,水平高的田块数量占比为20.90%;在权属分散度维度,田块的综合评价水平在0~0.902之间,其中综合评价水平低的田块数量占比为56.57%,水平较低的田块数量占比为33.55%,水平较高的田块数量占比为7.21%,水平高的田块数量占比为2.67%;在耕作便捷度维度,田块的综合评价水平在0.026~0.974之间,其中综合评价水平低的田块数量占比为24.60%,水平较低的田块数量占比为43.61%,水平较高的田块数量占比为25.49%,水平高的田块数量占比为6.30%。2)在空间关联特征上,自然禀赋度以高-高聚集及低-低聚集为主,权属分散度以低-低聚集为主,耕作便捷度以高-高聚集和低-低聚集为主。3)通过三维魔方空间组合并结合管控约束性将田块分为优质保育类、禀赋提升类、权属调整类、设施完善类、综合整治类、禁止整治类,并提出差异化治理策略。研究成果可为丘陵山区高标准农田建设的田块整治提供参考。

       

      Abstract: Cultivated land fragmentation is one of the key factors to hinder the high-quality agriculture. It is of great significance to construct a parcel-scale measurement system of the cultivated land fragmentation. Differentiated governance strategies are often required to promote the cultivated land fragmentation. This study aims to measure and classify the farmland parcel fragmentation in the hilly and mountainous areas. An example was then taken in the Hekou Town, Yunan County, Guangdong Province, China. A theoretical review was presented on the concept and connotation of the cultivated land fragmentation. Natural, tenure and cultivation of the parcels were then incorporated to combine with the questionnaire surveys and the decision-making on the high-standard farmland. A parcel-scale fragmentation measurement index system was constructed using the “natural endowment degree, tenure dispersion degree, and cultivation accessibility degree”. The three-dimensional composite index of parcel fragmentation was then calculated using TOPSIS model. The local spatial autocorrelation was utilized to explore the spatial aggregation relationship. Each administrative village was evaluated for the balance and differences in the variation of the mean and coefficients. Finally, the three-dimensional Rubik's cube model was used to form the guidance program for the classified consolidation. The results showed that: 1) In the dimension of natural endowment degree, the comprehensive evaluation level of the parcels in the study area was ranged from 0.219 to 0.716, where the majority was in the the lower and higher levels. In terms of the spatial differentiation, there was the relatively balance in the variation of the mean level and coefficient after comprehensive evaluation on each administrative village. Parcels with the superior natural endowment degree were formed the contiguous clusters in space. While the rest parcels exhibited the smaller clusters or lower levels of the aggregation, due to the low natural endowment degree. In the dimension of tenure dispersion degree, the comprehensive evaluation level of the parcels was ranged from 0 to 0.902, where the majority was in the lower and low grades. Parcels with the different comprehensive evaluation grades exhibited the relatively homogeneous spatial distribution. In the dimension of cultivation accessibility degree, the comprehensive evaluation level of the parcels was ranged from 0.026 to 0.974, with the majority in the lower and higher grades. Higher and high-grade parcels were tended to cluster spatially, due to the denser, higher-grade road networks and greater parcel adjacency. Other parcels, however, were largely constrained by natural conditions, leading to the high levels of the parcel adjacency. 2) In terms of the spatial correlation, the natural endowment degree was dominated by the high-high and low-low aggregation. The tenure dispersion degree was dominated by the low-low aggregation. And the cultivation accessibility degree was dominated by the high-high and low-low aggregation. 3) Three-dimensional Rubik's cube model was combined with the spatial combination and control constraints. The parcels were classified into the high-quality conservation, endowment enhancement, tenure adjustment, facility improvement, comprehensive consolidation, and prohibited consolidation. Differentiated consolidation strategies were proposed after optimization. The finding can also provide a strong reference to construct the parcel consolidation of the high-standard farmland in the hilly and mountainous areas.

       

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