Distribution of soil carbon storage in different saltmarsh plant communities in Chongming Dongtan wetland. AMeasuring and analyzing of the multi-seasonal spectral characteristics for saltmarsh vegetation in Shanghai IDENTIFICATION OF THE SPECTRAL CHARACTERISTICS OF SALTMARSH VEGETATION USING INDIRECT ORDINATION: A CASE STUDY FROM CHONGMING DONGTAN, SHANGHAI The expansion pattern of saltmarshes at Chongming Dongtan and its underlying mechanism