丘陵区耕地细碎化与种植多样性的空间相关性分析——以武胜县鸣钟乡为例

Spatial Correlation Between Land Fragmentation andPlant Diversity in Hilly Region:A Case Study of Mingzhong Township in Wusheng County

利用2019年分辨率为20 m的航拍影像矢量数据,获得武胜县鸣钟乡19个村的耕地细碎化景观指数,运用主成分降维分析方法,获取能够代表耕地细碎化的3个主成分(F_(1)、F_(2)、F_(3))指标,对鸣钟乡耕地细碎化与农户种植多样性的空间自相关规律进行了分析。结果表明:(1)主成分F_(1)、F_(2)、F_(3)累计方差贡献率大于90%,能够表达10个原始景观指数的大部分信息,代表耕地细碎化程度;(2)耕地细碎化Moran’s散点图显示,19个离散点中有12个离散点落入第一象限和第三象限,表明这些范围内的耕地细碎化程度与农作物种植多样性具有较强的空间正相关,局部集聚显著;(3)F_(1)、F_(2)、F_(3)与农户种植多样性空间聚集度指数显示,高值聚集区由中华村、响水滩村和龙庙村组成,低值聚集区由大锣山村、大石村和高升村组成。由此可见,耕地细碎化与农户种植多样性呈现空间正相关性,空间耦合度较好。

The land fragmentation landscape indexes of 19 villages in Mingzhong township is obtained by employing the aerial image vector data with a resolution of 20 m in 2019.The 3 principal components(F_(1),F_(2),F_(3))representing land fragmentation are determined by the analysis method of principal components dimension reduction,which is then used to analyze the spatial autocorrelation regularity between land fragmentation and plant diversity.The results show as follows:(1)the cumulative variance contribution rate of principal components(F_(1),F_(2),F_(3))is more than 90%,expressing most of the 10 original landscape indexes and representing the degree of land fragmentation;(2)Moran s scatter plot reveals that 12 of the 19 scattered points fall into the first and third quadrants,indicating that the degree of land fragmentation in these areas has a strong spatial positive correlation with crop planting diversity and the local concentration is significant;(3)the spatial aggregation index values of F_(1),F_(2),F_(3)and diversified planting space of farmers indicate that the high-value aggregation areas are Zhonghua village,Xiangshuitan village and Longmiao village while the low-value aggregation areas are Daluoshan village,Dashi village and Gaosheng village.It can be seen that there is a spatial positive correlation between land fragmentation and plant diversity of farmers,and the degree of spatial coupling is comparatively better.