中国生态用地研究: 内涵、分类与时空格局

  目的  从数量和质量双重角度分析生态用地的时空演化特征，探讨生态用地数量与质量变化的耦合关系，可推动区域生态环境保护及其可持续发展。  方法  引入景观连通性指数，提出了一种改进的基于数量和质量视角（QBQ，Quality-based quantity）的生态用地时空演变综合评估方法，对研究区生态用地的净变化和改进前、后基于数量和质量的生态用地变化进行了探讨。  结果  大南昌都市圈生态用地不断向非生态用地转变，生态用地净面积共减少1345.86 km²；不少县市生态用地出现了不同程度的碎片化现象，耕地和水域稳定性下降，二者QBQ值均有所减少；1 km阈值距离下，各县市不同类型生态用地的景观连通性存在较大差异，改进后除水域的QBQ值增加外，其余生态用地QBQ值均呈减少趋势。  结论  研究期内大南昌都市圈生态用地数量与质量的变化均呈下降趋势，通过引入景观连通性指数，能够深入了解生态用地数量与质量结构的变化，从而更真实地反映生态用地实际变化特征。

Exploring the mechanisms of ecological land change based on the spatial autoregressive model: a case study of the poyang lake eco-economic zone,China

  Objective  The paper aimed to analyze the spatiotemporal evolution characteristics of ecological land from the perspective of quantity-based quality, and to explore the coupling relationship between the quantity and quality of ecological land, which will help to promote regional ecological environment protection and sustainable development.   Method  This paper introduced the landscape connectivity index, and proposed an improved comprehensive evaluation method of ecological land spatial-temporal evolution with quality-based quantity. The net change of ecological land in the study area and the ecological land change on quantity-based quality before and after the improvement were discussed.  Result  The ecological land in the Greater Nanchang metropolitan area has been changing to non-ecological land, and the net area of ecological land has decreased by 1345.86 km². The ecological land in many counties and cities has been fragmented to varying degrees, and the stability of cultivated land and water area has decreased, and both QBQ values have decreased. Under the threshold distance of 1 km, the landscape connectivity of different types of ecological land in different counties and cities was significantly different. After improvement, the QBQ value of other ecological land showed a decreasing trend, except for the increase of the QBQ value of the water area.  Conclusion  During the study period, the changes in the quantity and quality of ecological land in the Greater Nanchang Metropolitan Area showed a downward trend. By introducing the landscape connectivity index, we can deeply understand the changes in the quantity and quality structure of ecological land, so as to more truly reflect the actual change characteristics of ecological land.