基于代表性样区的中国三省交界区景观生态安全评估

Landscape Ecological Security Assessment of the Tri-provincial Junctional Border Area in China Based on Representative Sample Areas

以全国尺度三省交界区为研究对象,采用最优化理论与方法,构建了三省交界研究区选取模型,确立了该典型边区的代表性样区,进而在景观生态学与地理学视角下对其安全水平及地形梯度效应进行了分析,得到以下结论:研究区景观生态安全水平整体较高,体现出南高北低的分异特征,基本以秦岭-淮河为界,东西差异不显著,低值区主要分布于海拔极高、自然环境恶劣,以及东部人类活动密集的平原地区;2000—2020年间多数区域安全水平呈上升趋势,升高区域呈北多南少研究区地形梯度Ⅰ—Ⅴ级景观生态安全水平随梯度的增加逐渐升高,Ⅴ级后随梯度的增加逐渐下降,Ⅴ级地形梯度内或为人类扰动可对安全水平造成影响的临界,之后安全水平随地形复杂程度的增加而降低。

This paper takes the China's tri-provincial junctional area as the research object,by applying optimization theory and methods,a selecting model at tri-provincial junction research area has been constructed,the representative sample areas have been established.Furthermore,its security level and effect of topographic gradient are analyzed from the perspectives of landscape ecology and geography,the conclusions are as follows:The overall level of landscape ecological security in the research area is relatively high,reflecting the differentiation feature of high in the south and low in the north.It is basically bounded by the Qinling Mountains and Huai River,with no significant difference between the east and west.Low value areas are mainly distributed in the plain areas with extremely high altitude,harsh natural environment,and dense human activities in the east.From 2000 to 2020,the safety level in most areas is on the rise,with the increasing areas showing a topographic gradient of more in the north and less in the south.The ecological safety level of the Ⅰ-Ⅴ level landscape gradually increases with the increase of the gradient,and then decreases with the increase of the gradient.Within the Ⅴ-level topographic gradient,there may be a critical impact of human disturbance on the safety level,and then the safety level decreases with the increase of terrain complexity.