摘要
建设用地急剧扩张导致土地利用覆被发生剧烈变化,物种栖息地丧失、破碎化及分离,严重威胁到社会经济及生态可持续发展。以快速城市化地区苏锡常为研究区域、地区优势物种白鹭生境为源地、"源地-廊道"生态安全格局构建逻辑范式为重要性评价依据,识别并筛选出对维护、控制目标物种生态过程具有重要意义的、可增强地区生境整体性及连通性的网络构成要素及其缓冲区,对缓冲区内建设用地进行减量化,提出一套建设用地减量化系统性方法。结果表明:(1)研究区内重要生态"源地"及"对应廊道"内建设用地需减量化10170.44 hm^(2),其中城镇用地5408.38 hm^(2),农村居民点4107.96 hm^(2),交通用地654.10 hm^(2)。(2)依据生态安全格局构建逻辑范式,增补保护不同类型"源地"及"对应廊道",可在提升区域生态安全水平的同时,识别出新的需要减量化的建设用地。该方法也可作为区域内存量及增量建设用地空间布局调整优化的依据,具有较好的普适性。
Rapid urban expansion-especially, urban sprawl-has led to dramatic changes in land use/land cover. These land use/land cover changes, in turn, have caused the loss, fragmentation, and isolation of habitats of various species, and furthermore, brought serious negative influences on the sustainability of social, economic, and ecological development. It is important to convert non-construction land into construction land wisely and optimize current land use patterns for the purpose of sustainable development and human well-being. This paper, based on source-corridor ecological security pattern paradigm, puts forward a set of systematic methods through which reduction of construction land can be realized such that biodiversity conservation and sustainable regional development can be achieved. The Su-Xi-Chang region was selected as a case study representing rapidly urbanizing areas. Habitats of the little egret(Egretta garzetta) as well as its migrating corridors and their buffer zones were identified as critical sources of local ecological land. Based on these habitats and corridors, including the buffer zones, the local ecological security pattern was built. Plots of construction land that were located within the buffer zones of the identified critical ecological sources were the plots to be reduced, i.e., they needed to be transferred into the same land-use type as that of habitats or corridors, to improve the current quality and connectivity of habitat networks. The results show that within the region, the total size of reduced construction land was 10170.44 hm^(2), among which sizes of urban land, rural residences, and transportation land-use types were 5408.38, 4017.96, and 654.10 hm^(2), respectively. Furthermore, based on the ecological security pattern paradigm, different ecological sources and their corresponding corridors and buffer zones could be identified from perspectives such as importance, vulnerability, sensitivity, and connectivity. Then, the regional ecological security pattern could be identified through overlapping plots of these critical ecological sources. Based on the order of importance of the different perspectives, the identification of construction land plots in the buffer zones from one perspective could then be repeated from a different perspective with less importance than the former, and the two steps could be overlapped-such that new plots of construction land could be recognized and converted into non-construction land-use types(i.e., reduced construction land)-resulting in improved local ecological security. The method generated in this study is suitable for regions with different characteristics, and can also be applied in optimizing scenarios where the total amount of construction land increases or remains unchanged. It is necessary to emphasize that the order of importance of different perspectives of ecological security of one region may not be the same as others;hence, the result of selected local critical ecological sources will not be the same among regions and cannot be simply copied from one region to another.
作者
刘壮壮
吴未
刘文锋
申立冰
LIU Zhuangzhuang;WU Wei;LIU Wenfeng;SHEN Libing(College of Land Management,Nanjing Agriculture University,Nanjing 210095,China;National&Local Joint Engineering Research Center for Rural Land Resources use and Consolidation,Nanjing 210095,China)
出处
《生态学报》
CAS
CSCD
北大核心
2020年第22期8230-8238,共9页
Acta Ecologica Sinica
基金
国家自然科学基金项目(41571176)。
关键词
土地利用格局优化
建设用地减量化
生态安全格局构建逻辑范式
源地-廊道
优势物种生境
白鹭
land use pattern optimization
construction land reduction
ecological security pattern paradigm
source-corridor
habitats of regional superior species
the little egret(Egretta garzetta)
