摘要
研究耕地质量与景观格局间的关系,可以为加强国家耕地质量保护和提升提供科学依据.利用江西省鹰潭市2022年耕地质量数据,在耕地质量评价的基础上综合分析鹰潭市的总体耕地质量状况.选取斑块面积、斑块占景观比例、边界密度、斑块密度、景观形状指数、平均斑块大小、景观分离度、蔓延度指数和香农多样性指数等景观格局指数在Fragstats 4.2软件中进行计算,再将耕地面积加权平均国家自然等别、利用等别、经济等别指数分别与选取的耕地景观格局指数进行相关性分析.研究得出,耕地质量国家自然等指数与耕地边界密度呈极显著负相关,相关系数为-0.393(P<0.01);耕地质量国家利用等指数与耕地平均斑块大小和香农多样性指数呈极显著正相关,相关系数分别为0.343(P<0.01)和0.416(P<0.01);耕地质量国家经济等指数与耕地边界密度呈极显著负相关,相关系数为-0.381(P<0.01).因此部分景观格局指数与耕地质量之间存在明显的相关性,可以在一定程度上反映该区域内耕地质量与景观格局指数间的关联.研究结果可为从景观格局角度实现耕地质量的提升与保护工作提供科学参考,对国家层面做出优化区域耕地空间布局决策也具有一定的现实意义.
Abstract
Studying the relationship between cultivated land quality and landscape patterns can provide a scientific basis for strengthening the protection and enhancement of national cultivated land quality.Using 2022 cultivated land quality data in Yingtan City,Jiangxi Province,the study comprehensively analyzed the overall cultivated land quality situation in Yingtan based on the cultivated land quality evaluation.Landscape pattern indices such as patch area,percent of landscape,edge density,patch density,landscape shape index,mean patch size,landscape division index,contagion index,and Shannon's diversity index were selected to calculate in Fragstats 4.2 software,and then cultivated land area weighted average national natural level index,cultivated land area weighted average national use level index and cultivated land area weighted average national economic level index were correlated with the selected cultivated landscape pattern indices,respectively.It was concluded that the cultivated land quality national natural level index was significantly and negatively correlated with the edge density of cultivated land,with a correlation coefficient of-0.393(P<0.01);the cultivated land quality national use level index was significantly and positively correlated with the mean patch size of cultivated land and the Shannon's diversity index,with correlation coefficients of 0.343(P<0.01)and 0.416(P<0.01),respectively;the cultivated land quality national economic level index was significantly and negatively correlated with the edge density of cultivated land,with a correlation coefficient of-0.381(P<0.01).Thus,there was a clear correlation between some of the landscape pattern indices and cultivated land quality,which could reflect to some extent the correlation between cultivated land quality and landscape pattern indices within the region.The results of the study can provide scientific references for the improvement and protection of cultivated land quality from the perspective of landscape pattern,and also have certain practical significance for the national level decision-making on the optimization of regional spatial layout of cultivated land.
基金项目
江西省教育厅科学技术研究项目(GJJ210451)
万方数据