Management of World Heritage Sites from the Perspective of Administrative Division Adjustment: A Case Study of Lushan,Jiangxi Province

The protection and management of world heritage has always been a hot topic in academic circles. In recent years,the number of linear heritage has increased significantly,which brings a new challenge to the monitoring and management of heritage sites. From the perspective of administrative division adjustment,and taking Lushan of Jiangxi Province as an example,it may be a feasible attempt to manage linear heritage and similar heritage sites with multiple points of distribution.

Multi-source Remote Sensing Image Registration Based on Contourlet Transform and Multiple Feature Fusion

Image registration is an indispensable component in multi-source remote sensing image processing. In this paper, we put forward a remote sensing image registration method by including an improved multi-scale and multi-direction Harris algorithm and a novel compound feature. Multi-scale circle Gaussian combined invariant moments and multi-direction gray level co-occurrence matrix are extracted as features for image matching. The proposed algorithm is evaluated on numerous multi-source remote sensor images with noise and illumination changes. Extensive experimental studies prove that our proposed method is capable of receiving stable and even distribution of key points as well as obtaining robust and accurate correspondence matches. It is a promising scheme in multi-source remote sensing image registration.

Virtual geographic environments(VGEs):originating from or beyond virtual reality(VR)?

Since virtual geographic environments(VGEs)were unofficially proposed for the first time at a conference in 1998,nearly two decades have passed.During these years,VGE has experienced several stages of evolution(Chen,Lin,and Lu 2017),and its definition has been modified over the course of its evolution(see Lin and Gong 2001;Lin and Zhu 2005;Gong,Zhou,and Zhang 2010;Lu 2011;Lin,Chen,and Lu 2013;Lin et al.2013;Chen et al.2017).Currently,the term VGE can be described as a kind of digital geographic environment generated by computers and related technologies that users can use to experience and recognize complex geographic systems and further conduct comprehensive geographic analyses.

Testing mechanisms underlying elevational patterns of lakeshore plant community assembly in Poyang Lake, China

Aims Plant community assembly in wetlands usually changes with eleva-tion gradients,which may be due to the direct effect of flooding and indirect effects such as changes in soil properties and competition.However,the respective importance of each factor remains to be investigated.Methods We investigated patterns of plant diversity,community biomass and soil properties along an elevation gradient of a lakeshore meadow at Poyang Lake,China.Important Findings(i)With increasing elevation,species richness and Simpson diver-sity index decreased.Both aboveground biomass(AGB)and below-ground biomass(BGB)increased with elevation,however,the BGB/AGB ratio also increased,which suggests a significant effect of belowground competition.(ii)Soil N content and soil N:P ratio increased,whereas soil pH decreased with elevation.Other soil properties showed no significant response.(iii)Structural equa-tion modeling showed that variation of plant diversity was mainly explained by BGB.Thus,intensified belowground competition seems to be the primary mechanism causing lower plant diversity at higher elevations.(iv)These findings were further supported by the observed greater response ratio of N and P storage in plant commu-nities than the response ratio of soil N and P content to elevation,suggesting that soil nutrient limitation and belowground nutrient competition increased with elevation.Our study has important implications to wetland management and biodiversity conserva-tion under environmental change(e.g.changes in flooding regimes,eutrophication).