一种景观生态脆弱性指数构建及验证方法

New method of constructing landscape ecological vulnerability index and rationality verification

针对目前景观格局指数构建方法中人为扰动因素关注不够及没有景观生态脆弱性指数构建合理性验证方法的问题,提出了一种结合景观脆弱性指数和人口压力指数加权构建景观生态脆弱性指数的方法及一种景观类型变化等级加权值与景观生态脆弱性指数变化值进行回归分析的景观生态脆弱性指数构建合理性验证方法,以松花江流域(哈尔滨段)为实验区域,对实验区域2010年和2015年景观生态脆弱性指数进行构建,对两期景观生态脆弱性指数进行减运算获得研究区域景观生态脆弱性指数变化分布图。2010-2015年间,研究区域内景观生态脆弱性普遍降低,其中,景观生态脆弱性降低程度较高的区域主要分布在研究区域西部,研究区域中东部景观脆弱性变化不明显。通过两期景观生态脆弱性指数变化值与景观类型变化等级加权值进行相关分析,结果表明两者强相关,相关系数为0.795,即验证了本景观生态脆弱性指数构建的合理性,为景观生态脆弱性计算及验证提供了科学的方法。

Insufficient attention is paid to human disturbance in the construction of landscape pattern index and no rationality verification method of landscape ecological vulnerability index construction.A method of constructing landscape ecological vulnerability index with the weighted index of landscape fragility and population pressure index is proposed,and a rationality verification method of landscape ecological vulnerability index is established by regression analysis of the weighted values of landscape type change grade and the change values of the landscape ecological vulnerability index.The method is used in the Songhua River basin(HAL).As the experimental object,the landscape ecological vulnerability index of the study area in 2010 and 2015 is constructed,the landscape ecological vulnerability index of the two periods is subtracted to obtain the change distribution map of the landscape ecological vulnerability index.From2010 to 2015,the vulnerability of landscape ecology in the study area is generally reduced,and the region with higher degree of vulnerability of landscape ecology is mainly distributed in the western part of the study area,and the change of landscape vulnerability in the eastern part of the study area is not obvious.The regression analysis is carried out through the changes of the landscape ecological vulnerability index and the grade weighted value of the landscape type change.The results show that the correlation coefficient is 0.795,which verifies the rationality of the construction of the landscape ecological vulnerability index.The method provides a scientific method for calculation and validation of landscape ecological vulnerability.