不同地貌区县域耕地质量与耕地景观格局关联性特征分析

Correlation Characteristics between Cultivated Land Quality and Landscape Pattern in Different Landform Areas

为深入分析不同地貌区县域耕地质量与耕地景观格局的关联性特征,运用LESA评价体系和景观指数计算方法,对比分析平原、丘陵及山地三种地貌类型下的县域耕地质量及其景观格局特征,应用地理加权回归模型,探讨不同地貌条件下耕地景观格局对耕地质量的影响机制。研究结果表明:平原区县域耕地质量优于丘陵及山地区,丘陵及山地区耕地破碎化和景观多样性程度高于平原区,耕地景观优势度低于平原区;在三种地貌类型下耕地景观格局对耕地质量均有一定的解释和影响能力,其中聚合度指数(AI)是平原和丘陵区耕地质量最主要的景观影响因素,斑块密度(PD)和最大斑块指数(LPI)对耕地质量影响强度表现为山地区>丘陵区>平原区,面积加权平均形状因子(AWMSI)在不同地貌区对耕地质量均呈显著负向影响,香浓多样性指数(SHDI)在平原区表现为正向影响,在丘陵和山地区表现为负向影响。县域内各景观格局指数对耕地质量的影响具有空间差异性。研究结果为不同地貌区从优化耕地景观格局角度提升耕地质量提供新思路。

In order to analyze the correlation between cultivated land quality and landscape pattern in different landform areas, this paper used the LESA evaluation system and Fragstats software to compare the county cultivated land quality and its landscape pattern characteristics amongtheplain area, hill area and mountain area.And then, the geographic weighted regression model was usedto analyze the impact of cultivated land landscape pattern on cultivated land quality. Results showed that the quality of cultivated land in the plain area wasbetter than those in the hilly and mountain areas. In terms of landscape pattern characteristics, the degree of fragmentation of cultivated land and the diversity of landscape types in the hilly and mountain areaswerehigher than those in the plain area.And the landscape dominance of cultivated land was lower than that ofplain area. Under the three types of landforms, the landscape pattern of cultivated land had a certain ability to explain and influence the quality of cultivated land. AI wasthe most important landscape influencing factor of cultivated land quality in the plain and hilly areas.The intensity of PD and LPI on the quality of cultivated land wasthe strongest in the mountain area,followed by hilly area, and weakest in the plain area. AWMSI had a significant negative impact on cultivated land quality in different landform areas. SHDI showed a positive impact on the plain area and a negative impact onthe hilly and mountain areas. The impact of each landscape pattern index on the quality of cultivated land in the county wasspatially different. The research results have provided new ideas for improving the quality of cultivated land from the perspective of optimizing the landscape pattern of cultivated land in different landform areas.