China’s corridor bridges:heritage buildings over water

Essentially unknown in the rest of the world and only recently appreciated in China,the globally significant 3000+‘corridor bridges’(langqiao)in China far outnumber the better-known‘covered bridges’found in North America and Europe.Rivaling or exceeding those in the West in number,age,complexity,and architectural ambition,some of China’s outstanding timber langqiao in the mountains of Fujian and Zhejiang provinces are on the cusp of being inscribed as UNESCO World Heritage cultural sites.Throughout south and central China today there is moreover a resurgence of new timber langqiao being erected using traditional carpentry alongside the unprecedented construction of modern marvels of steel and concrete.Archaeological evidence in 2001 uncovered China’s earliest‘corridor bridge’—thus the oldest known covered bridge in the world—with a length of 42m dating to the Han dynasty 2000 years ago.The Rulong Bridge,which dates to 1625 and is documented as the oldest standing woven arch-beam langqiao,can be visited today in Qingyuan county,southern Zhejiang.Even older langqiao with parallel log beams as the substructure have come to light in neighboring Fujian province,most notably the Zhiqing Bridge in a rural area of Jian’ou city that dates to 1490.China’s bridges,whether with a corridor atop or without,have traditionally not been included under the umbrella of‘vernacular architecture’even as they usually were created by local craftspeople employing the same approaches and practices for dwellings and temples.Just as with these better researched structures,langqiao must be studied not only from the perspective of architecture,but also anthropology,geography,history,and sociology,among other disciplines.Rather than being abandoned as artifacts from the past,China’s langqiao today represent a living tradition that continues serving rural communities as places of passage,spaces for leisure and marketing,sites for worship,and increasingly destinations for tourists in search of nostalgic connections with China’s past.The research presented in this article draws heavily from the authors’China’s Covered Bridges:Architecture over Water,a comprehensive book published in late 2019 in Shanghai and London by Shanghai Jiao Tong University Press that will be distributed in 2020 by the University of Hawai’i Press.Despite the scope of this book,the complexity of China’s langqiao remains understudied.

21世纪新亚欧大陆桥经济走廊LUCC机理的定量解析

Land cover change has presented clear spatial differences in the New Eurasian Continental Bridge Economic Corridor(NECBEC)region in the 21 st century.A spatiotemporal dynamic probability model and a driving force analysis model of land cover change were developed to analyze explicitly the dynamics and driving forces of land cover change in the NECBEC region.The results show that the areas of grassland,cropland and built-up land increased by 114.57 million ha,8.41 million ha and 3.96 million ha,and the areas of woodland,other land,and water bodies and wetlands decreased by 74.09 million ha,6.26 million ha,and 46.59 million ha in the NECBEC region between 2001 and 2017,respectively.Woodland and other land were mainly transformed to grassland,and grassland was mainly transformed to woodland and cropland.Built-up land had the largest annual rate of increase and 50%of this originated from cropland.Moreover,since the Belt and Road Initiative(BRI)commenced in 2013,there has been a greater change in the dynamics of land cover change,and the gaps in the socio-economic development level have gradually decreased.The index of socio-economic development was the highest in western Europe,and the lowest in northern Central Asia.The impacts of socio-economic development on cropland and built-up land were greater than those for other land cover types.In general,in the context of rapid socio-economic development,the rate of land cover change in the NECBEC has clearly shown an accelerating trend since 2001,especially after the launch of the BRI in 2013.