辽宁省昌图县非耕地斑块对耕地系统景观异质性的影响  

Effects of Non-cultivated Patch on Landscape Heterogeneity of Cultivated Land System in Changtu County,Liaoning Province.

作　　者：边振兴[1] 关明昊 佟昊轩 杨玉静 初琢明 于淼[2] BIAN Zhen-xing;GUAN Ming-hao;TONG Hao-xuan;YANG Yu-jing;CHU Zhuo-ming;YU Miao(College of Land and Environment,Shenyang Agricultural University,Shenyang 110866,China;College of Science,Shenyang Agricultural University,Shenyang 110866,China)

机构地区：[1]沈阳农业大学土地与环境学院,辽宁沈阳110866 [2]沈阳农业大学理学院,辽宁沈阳110866

出　　处：《生态与农村环境学报》2022年第10期1330-1337,共8页Journal of Ecology and Rural Environment

基　　金：辽宁省自然科学基金(2019-ZD-0709)。

摘　　要：景观异质性是维持耕地系统生物多样性及多种生态系统服务功能的基础。为探明非耕地对耕地系统景观异质性的作用,以辽宁省昌图县为研究区,在划定网格单元的基础上,采用Rao二次熵指数(Q)表征其景观异质性,通过冗余分析、独立样本t检验及回归分析等方法探讨非耕地斑块对景观异质性及影响。结果表明:当不同网格单元非耕地比例相近时,景观异质性存在明显差异;当非耕地比例为8%时,景观异质性差异最大。林地、草地、农村道路、水域及沟渠5种非耕地类型对景观异质性均有极显著正向影响(P<0.01),其中林地对景观异质性的影响程度最大。景观异质性不同的网格单元中非耕地斑块的平均最近邻体距离指数(ENN_MN)存在显著性差异(P<0.05)。非耕地斑块连通性越强,景观异质性也越强。研究结果可为严守耕地红线背景下的耕地生态管护提供参考借鉴。Landscape heterogeneity is the basis for maintaining biodiversity and ecosystem services in cultivated land system.To explore the effect of non-cultivated land on landscape heterogeneity of cultivated land system,taking Changtu county of Liaoning Province as the study area,Rao quadratic entropy index(Q)was used to characterize landscape heterogeneity based on grid units,and the effect of non-arable patches on landscape heterogeneity was investigated by redundancy analysis,independent sample T test,regression analysis and other methods.The results indicate that:(1)when the proportion of non-arable land of the sample grid units was similar,there was a significant difference in landscape heterogeneity.When the proportion of non-arable land of the sample grid units was 8%,the difference of landscape heterogeneity between the units was the largest.(2)Forest land,grassland,rural road,water area and ditch had significant positive effects on landscape heterogeneity(P<0.01),and forest land had the greatest effect.(3)The mean nearest neighbor distance index(ENN-MN)of non-arable land patches in grid units with different landscape heterogeneity was significantly different(P<0.05).The stronger the non-arable patch connectivity was,the stronger the landscape heterogeneity was.This paper can provide reference for the ecological management and protection of cultivated land in the context of strictly protecting the red line of cultivated land.

关 键 词：耕地系统 景观异质性 非耕地比例 连通性 

分 类 号：X87[环境科学与工程—环境工程] P901[天文地球—自然地理学]