森林景观斑块耦合体的筛选及特征分析研究

Research on Selection and Characteristics Analysis of Forest Landscape Patches Coupling System

在景观尺度上提出"森林景观斑块耦合体"。从耦合体的构建条件、构建方法和筛选方法上进行论述,并对耦合体内的斑块类型进行统计,结合景观指数对不同类型耦合体进行特征分析:1)结合所需的耦合体数,设定耦合体中受人为干扰较强的斑块数占总斑块数的比例为阈值X,设定耦合体中斑块类型数占研究区总斑块类型数的比例为阈值Y。当X等于30%且Y等于50%时,可选耦合体53个,其信息能在一定程度上代表所有耦合体的信息,方法较为合理。2)巨型耦合体主要位于大型山脉或偏远山区,其耦合体内部斑块受到的人为干扰较弱;微型耦合体则主要集中在村庄或住宅区附近,其耦合体内部斑块受到的人为干扰较强。3)巨型耦合体各项景观指数均为最优,为最理想耦合体;微型耦合体则较差;大型、中型耦合体处于中间水平,且由于数量较多,应作为研究重点。通过对耦合体的筛选和分析,可为下一步研究耦合体内部能量和物质的循环打下基础。

In the scale of landscape,＂the forest landscape patch coupling system＂was raised,and was discussed from the coupling system construction condition,construction method and screening method. Furthermore,combined with the landscape index,statistics were carried out to the patch types of the coupling system for characteristics analysis. The results were as follows： 1） Threshold value X when equal to 30%,was set as the ration between the number of patches that can be easily affected by human interference and the number of total patches. When screening the coupling,the type of the coupling patches should be greater than or equal to the proportion of different patches in the study area,which was set as the threshold value Y. When Y was equal to 50%,information of the selected coupling system can represent all the others,which was a rational approach. 2） Giant coupling system was mainly located in the mountains or in remote mountainous areas,micro coupling system was mainly concentrated in the nearby villages or residential areas,the inside patch of these coupling system can be easily affected by human interference. 3） Index of giant coupling system were the best,was the most ideal coupling system. Micro coupling was poor. Large and medium-sized couplings were in the middle level and should be the focus because of its large number. The screening and analysis of the coupling system can provide a basis for the next step research on flow of the energy and material inside the coupling system.