中国生态农业学报2017，Vol.25Issue(7)：983-992,10.DOI:10.13930/j.cnki.cjea.161125
黄河中下游典型河岸缓冲带植被景观连接度及其网络构建
Landscape connectivity and network construction of riparian vegetation in typical reach of the middle and lower reaches of Yellow River
摘要
Abstract
Riparian ecosystems form the linkages and exchange zones of matter, energy and information between aquatic and terrestrial ecosystems. The characteristics of such zones significantly influence integrated landscape ecosystem functions from land to riparian regions. Riparian vegetation as an important component of riparian ecosystem, is the basis of the formation and maintenance of riparian buffer zone ecosystem services. However, riparian vegetation has now been widely recognized as fragile and sensitive system requiring conservation as it undergoes strong disturbances and great alteration by anthropogenic activities globally. Conservation activities have largely focused on the restoration or creation of natural areas to facilitate the movement of organisms. This is often based on reliable measurement of landscape connectivity and patch importance. In this study, a typical riparian buffer zone in the middle and lower reaches of Yellow River was analyzed for landscape connectivity and importance of riparian vegetation in 2003, 2009 and 2015 using remote sensing, landscape connectivity indexes, patch importance evaluation and corridor-network analysis. Also the study constructed a riparian vegetation corridor-network in order to provide support for maintaining biodiversity in riparian buffer zones in the middle and lower reaches of Yellow River. The results indicated that land-scape connectivity of riparian vegetation increased both from 2003 to 2015 and with increasing threshold distance. Thus the number of links (NL) and the number of the largest component (NLC) of vegetation patches increased from 2003 to 2015 and they increased with increasing threshold distance. However, the number of components decreased from 2003 to 2015 and with in-creasing threshold distance. The integral index of connectivity (IIC) and the probability of connectivity (PC) increased with in-creasing threshold distance. Under different threshold distances, the importance value increased with increasing patch area. Thus with increasing threshold distance, the importance value of small patches (0-5 hm2) increased gradually, that of middle patches (5-10 hm2) initially increased and then decreased, while those of large patches (>10 hm2) decreased gradually. When the threshold distance was more than 1000 m, the importance values of small, middle and large patches became stable, indicating that 1000 m was the optimal threshold distance for the analysis of landscape connectivity in the study area. Ultimately, the corri-dor-network analysis proved to be important reference for the construction of riparian vegetation corridor-network. It si-multaneously considered important ecological nodes, ditches and road corridors in the study area as the established vegeta-tion network system had high corridor node number, network closure and connection degree. In addition, riparian vegeta-tion corridor-network construction should not only prioritize the connection between large patches, but also emphasize the stepping-stone role of small and middle patches between the large patches.关键词
河岸缓冲带/植被/景观连接度/斑块重要值/植被廊道网络/黄河中下游Key words
Riparian buffer zone/Vegetation/Landscape connectivity/Patch important value/Vegetation corridor-network/Middle and lower reaches of Yellow River分类
社会科学引用本文复制引用
赵清贺,马丽娇,刘倩,丁圣彦,卢训令,曹梓豪,张祎帆..黄河中下游典型河岸缓冲带植被景观连接度及其网络构建[J].中国生态农业学报,2017,25(7):983-992,10.基金项目
中国博士后科学基金项目(2015T80766, 2014M550382)、国家自然科学基金项目(41301197, 41371195)、黄河中下游数字地理技术教育部重点实验室开放基金(GTYR2013010)和河南省高校科技创新团队支持计划(16IRTSTHN012)资助 This study was funded by the China Postdoctoral Science Foundation (2015T80766, 2014M550382), the National Natural Sciences Founda-tion of China (41301197, 41371195), the Opening Project of the Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions, Ministry of Education, China (GTYR2013010), and the Program for Innovative Research Team (in Science and Technology) in University of Henan Province (16IRTSTHN012). （2015T80766, 2014M550382）
