凌河口湿地是辽河三角洲湿地的重要组成部分,是辽宁省自然保护区。以5年TM影像为数据源,对8种土地利用景观类型的总面积及斑块数量进行计算,并对选定的4个景观空间格局指数进行计算,以计算结果为依据定量分析了凌河口湿地的景观破碎化...凌河口湿地是辽河三角洲湿地的重要组成部分,是辽宁省自然保护区。以5年TM影像为数据源,对8种土地利用景观类型的总面积及斑块数量进行计算,并对选定的4个景观空间格局指数进行计算,以计算结果为依据定量分析了凌河口湿地的景观破碎化特征。结果表明:受人为活动影响,1995年到2005年,景观破碎化程度加大;由于对湿地加强了保护,2005年到2014年景观破碎度稍有降低。依据人与生物圈计划(Man and the Biosphere Programme,MAB)提出的保护区功能区划分原则,结合景观破碎化分析结果以及湿地内的实际情况首次对凌河口湿地功能区进行划分,结果表明:核心区总面积320.51 km2,缓冲区总面积270.53 km2,试验区总面积267.68 km2。研究结果对保护凌河口湿地生态系统完整性和生物多样性具有重要意义,同时也为凌河口湿地资源的开发及利用提供了参考。展开更多
Road network is a corridor system that interacts with surrounding landscapes,and understanding their interaction helps to develop an optimal plan for sustainable transportation and land use.This study investigates the...Road network is a corridor system that interacts with surrounding landscapes,and understanding their interaction helps to develop an optimal plan for sustainable transportation and land use.This study investigates the relationships between road centrality and landscape patterns in the Wuhan Metropolitan Area,China.The densities of centrality measures,including closeness,betweenness,and straightness,are calculated by kernel density estimation(KDE).The landscape patterns are characterized by four landscape metrics,including percentage of landscape(PLAND),Shannon′s diversity index(SHDI),mean patch size(MPS),and mean shape index(MSI).Spearman rank correlation analysis is then used to quantify their relationships at both landscape and class levels.The results show that the centrality measures can reflect the hierarchy of road network as they associate with road grade.Further analysis exhibit that as centrality densities increase,the whole landscape becomes more fragmented and regular.At the class level,the forest gradually decreases and becomes fragmented,while the construction land increases and turns to more compact.Therefore,these findings indicate that the ability and potential applications of centrality densities estimated by KDE in quantifying the relationships between roads and landscapes,can provide detailed information and valuable guidance for transportation and land-use planning as well as a new insight into ecological effects of roads.展开更多
Over the past several decades,large scale of tidal flat reclamation developed fast along the Chinese coastline.Tidal flat reclamation can earn profits for local economy but also produce significant negative influences...Over the past several decades,large scale of tidal flat reclamation developed fast along the Chinese coastline.Tidal flat reclamation can earn profits for local economy but also produce significant negative influences on marine ecosystems.By using relative indexes of landscape science,this article makes quantitative research on reclamation indexes of Zhejiang Province,China from1990to2000in a macro-region perspective,and the results shows that:(1)within20years,the total area of reclamation in Zhejiang Province had reached108760ha,and the reclamation area of Ningbo city was the largest while Jiaxing city is the smallest;(2)the patch area,quantity,density and variable coefficients of all types of lands were markedly different,and lands in different regions also differed distinctly;(3)average form index and fragmentation index of patch of lands of different types and functions were positively correlated,and the indexes of Taizhou city and Ningbo city were relatively high while Jiaxing city and Shaoxing city were lower;(4)under the influence of factors like topographic conditions,develop needs,human activities and so on,the degree of aggregation of the types of reclamation was relatively high;(5)because of the differences in reclamation area,coast length,land type and so on,the average intensity index and diversity index of the all coastal cities were different distinctly.展开更多
文摘凌河口湿地是辽河三角洲湿地的重要组成部分,是辽宁省自然保护区。以5年TM影像为数据源,对8种土地利用景观类型的总面积及斑块数量进行计算,并对选定的4个景观空间格局指数进行计算,以计算结果为依据定量分析了凌河口湿地的景观破碎化特征。结果表明:受人为活动影响,1995年到2005年,景观破碎化程度加大;由于对湿地加强了保护,2005年到2014年景观破碎度稍有降低。依据人与生物圈计划(Man and the Biosphere Programme,MAB)提出的保护区功能区划分原则,结合景观破碎化分析结果以及湿地内的实际情况首次对凌河口湿地功能区进行划分,结果表明:核心区总面积320.51 km2,缓冲区总面积270.53 km2,试验区总面积267.68 km2。研究结果对保护凌河口湿地生态系统完整性和生物多样性具有重要意义,同时也为凌河口湿地资源的开发及利用提供了参考。
基金Under the auspices of National Key Technology Research and Development Program of China(No.2012BAH28B02)
文摘Road network is a corridor system that interacts with surrounding landscapes,and understanding their interaction helps to develop an optimal plan for sustainable transportation and land use.This study investigates the relationships between road centrality and landscape patterns in the Wuhan Metropolitan Area,China.The densities of centrality measures,including closeness,betweenness,and straightness,are calculated by kernel density estimation(KDE).The landscape patterns are characterized by four landscape metrics,including percentage of landscape(PLAND),Shannon′s diversity index(SHDI),mean patch size(MPS),and mean shape index(MSI).Spearman rank correlation analysis is then used to quantify their relationships at both landscape and class levels.The results show that the centrality measures can reflect the hierarchy of road network as they associate with road grade.Further analysis exhibit that as centrality densities increase,the whole landscape becomes more fragmented and regular.At the class level,the forest gradually decreases and becomes fragmented,while the construction land increases and turns to more compact.Therefore,these findings indicate that the ability and potential applications of centrality densities estimated by KDE in quantifying the relationships between roads and landscapes,can provide detailed information and valuable guidance for transportation and land-use planning as well as a new insight into ecological effects of roads.
基金supported by the National Natural Science Foundation of China(No.U1609203,41471004)the K.C.Wong Magna Fund of Ningbo University
文摘Over the past several decades,large scale of tidal flat reclamation developed fast along the Chinese coastline.Tidal flat reclamation can earn profits for local economy but also produce significant negative influences on marine ecosystems.By using relative indexes of landscape science,this article makes quantitative research on reclamation indexes of Zhejiang Province,China from1990to2000in a macro-region perspective,and the results shows that:(1)within20years,the total area of reclamation in Zhejiang Province had reached108760ha,and the reclamation area of Ningbo city was the largest while Jiaxing city is the smallest;(2)the patch area,quantity,density and variable coefficients of all types of lands were markedly different,and lands in different regions also differed distinctly;(3)average form index and fragmentation index of patch of lands of different types and functions were positively correlated,and the indexes of Taizhou city and Ningbo city were relatively high while Jiaxing city and Shaoxing city were lower;(4)under the influence of factors like topographic conditions,develop needs,human activities and so on,the degree of aggregation of the types of reclamation was relatively high;(5)because of the differences in reclamation area,coast length,land type and so on,the average intensity index and diversity index of the all coastal cities were different distinctly.
