基于趋势面的耕地质量空间分异特征及影响因素

耕地质量监测工作的本质不仅是要掌握耕地质量现状，更重要的是探究其分布规律的内在机理，以对区域整体的发展趋势进行预测评价。对影响耕地质量的因素进行分析研究，从空间上揭示耕地质量分异的特性，可在耕地质量建设过程中有针对性地提出差别化管理措施，切实满足提升区域耕地综合生产保障能力的需要。结合农用地分等成果，以北京市大兴区为例，运用趋势面分析和相关分析相结合的方法研究了耕地质量空间分布规律及影响因素。研究得出了大兴区耕地质量总体呈现由东北部到西南部以斜向条带状降低的趋势的结论，并在此基础上将大兴区的耕地质量分布划为Ⅰ，Ⅱ，Ⅲ级质量潜力区；Ⅰ级区是大兴区质量一般的耕地，其利用价值提升空间最大。各级区内耕地质量具有较强的空间相关性，Ⅰ级区内质量分异主要源于土壤有机质；Ⅱ级区内质量分异主要源于土壤质地；Ⅲ级区内质量分异主要源于土壤质地，据此提出了差别化的耕地质量分区管控的建议。

Analysis of the Spatial Distribution Pattern of Cultivated Land Quality and the Influential Factors Based on Trend-Surface

Monitoring the quality of cultivated land is to fully understand the current quality status of China’s cultivated land, but what’s more is to explore the internal mechanism of its regularity of distribution as ways to help forecast and evaluate development tendencies of regional cultivated land quality. When we analyze and study influential factors of cultivated land quality disparities and reveal spatial characteristics of cultivated land quality differentiation, we are able to tailor differential management measures on improving cultivated land quality and meet the demands for enhancing the overall supporting comprehensive production capacity of regional cultivated land. Taking Daxing District in the Beijing area as an example, with tendency analysis and related analysis approaches, we study the spatial distribution pattern of cultivated land quality and their influential factors in combination with farmland classification outcomes. It concludes that the quality of the cultivated land in Daxing District decreases from the northeast to the southwest in the diagonal strip pattern, and further the cultivated land in Daxing District can be divided into Grade I-Ⅲ quality potential areas, Grade-I area is the worst quality and the largest value improving space. We also correspondingly analyze the key factors resulting in quality differentiation within each area, that is Grade-I area is mainly due to soil organic matter, Grade-Ⅱ area is mainly due to soil texture, Grade-Ⅲ area is mainly due to soil texture. Meanwhile, we accordingly propose to conduct partition management and control over cultivated land quality.