江苏省土地生态网络规划中源地的选取研究

区域土地生态网络构建是土地生态建设的重要内容。当前研究中，多尺度的生态源地选取研究涉及较少，需进一步深入研究。该文以江苏省为研究区，基于土地利用调查数据开展全省土地生态敏感性与重要性评价分级，并在此基础上选取敏感、极敏感和重要、极重要图斑并经阈值筛选确定生态源地，生成架构生态廊道，规划形成江苏省域含多层级的土地生态网络系统。研究结果表明：(1)江苏省域土地生态网络可由31个一级源地、175个二级源地、1 313个三级源地和61条一级廊道、345条二级廊道、3 882条三级廊道组成，面积为23 526.26 km2，占全省总面积的22.04%；(2)一级生态源地主要由江、湖、水域湿地构成，二、三级源地以水田、林地为主。其中，长江、太湖、南通段沿海湿地、洪泽湖、高邮湖、盐城南段沿海湿地、盐城北段沿海湿地、骆马湖、滆湖、白马湖是省域内最主要的生态源地，连通度综合指数（dIIC）在1 519个生态源地中居前10名，对全域土地生态连通起重要作用；(3)土地生态敏感性、重要性评价结果是生态源地选取确定的重要基础和依据，据此并结合生态廊道构建能较好地实现区域土地生态网络的规划。

Study on the Selection of Source Sites in the Land Ecological Network Planning of Jiangsu Province

The construction of regional land ecological network is an important content of land ecological construction. In the current research, the selection of multi-scale ecological source sites involves less research, and further research is needed. This paper takes Jiangsu Province as the research area and conducts evaluation of land ecological sensitivity and importance based on land use survey data. On this basis, sensitive, extremely sensitive, important, and extremely important vectors were selected and ecological source places were determined through threshold screening. Ecological corridors were then generated to form a multi-level land ecological network system plan in Jiangsu Province. Results of the research are: (1) The land ecological network system of Jiangsu province consisted of 31 primary sources, 175 secondary ones, 1313 third-level ones as well as 61 primary corridors, 345 secondary ones, 3882 third-level ones, and the area of those was 23 526.26 km2, accounting for 22.04% of the total area of Jiangsu. (2) The primary ecological sources were mainly composed of river, lake and wetland area, while the majority of the second and third ones were paddy field and woodland. Among these, the Yangtze River, Taihu, Nantong section of coastal wetlands, Hongze lake, Gaoyou lake, the southern section of Yancheng coastal wetlands, the northern section of Yancheng coastal wetlands, Luoma Lake, Ge Lake, Baima Lake were the most fundamental ecological sources, with the integral index of connectivity (dIIC) standing in the top 10 list among 1 519 ones, which made great contributions to the land ecological connectivity in general. (3) The results of evaluation of land ecological sensitivity and importance are key foundation and basis of the selection of ecological sources. In addition, a combination of ecological sources and corridors can better realize the planning of regional land ecological network.