基于电路理论的滇金丝猴生境景观连通性分析

景观连通性对生态系统服务、动植物基因交流的保护以及景观规划等都具有重要影响作用。以滇金丝猴活动区域为研究对象,基于电路理论建立滇金丝猴栖息地的连接度模型,分析滇金丝猴栖息地间的连通性,对于连通性较好的区域,识别出了重点保护与恢复区域;对于连通性较差的区域,通过电路理论连接度模型确定了影响今后廊道建设的重点保护与恢复区域。结果表明:各区域内部猴群栖息地连通性较好,其中中部地区最优,其次是北部,最差为南部。G3和G4栖息地斑块作为对连接各区域猴群生境斑块起到关键作用的"踏脚石"斑块是今后重点保护与恢复的区域,保护和恢复南部与中部猴群栖息地间"空白区域"的植被对于整个滇金丝猴活动区域的猴群基因交流也尤为重要。方法上,相较于图论得到的单一路径,电路理论得到的多路径更具有现势性。研究方法及研究成果可为濒危物种保护和区域生态廊道设计提供重要参考价值。

Analysis of the landscape-level connectivity of the Yunnan snub-nosed monkey habitat based on circuit theory

Landscape connectivity has important consequences for conservation of ecosystem services, gene flow, and landscape planning. In this study, the connectivity between the habitat patches occupied by the Yunnan snub-nosed monkey was analyzed based on circuit theory. In areas with more contiguous habitat, the key conservation and restoration areas have been identified as "stepping stones". On the other hand, in areas where habitat contiguity is low, the key protection and restoration areas for corridor construction have been determined by using the connectivity model of circuit theory. In this study, the results indicated that:the connectivity of each intra-regional monkey groups was superior. Areas in the middle showed the best connectivity, followed by those in the north, while the worst areas were distributed in the south. The habitat patches G3 and G4 in the north were identified as "stepping stones" and play a pivotal role in connecting the monkey habitat patches that are key areas for conservation and restoration. At the same time, the protection and restoration of vegetation between the southern and central monkey habitats is particularly important for gene exchange to avoid inbreeding depression and the long term survival of the southern population of Yunnan snub nosed monkey. Compared with the single path obtained by graph theory, the multipath obtained by circuit theory is more realistic. The methods followed in this study and our findings provide an effective scientific basis for a regional ecological corridor design for the protection of this endangered species.