JOURNAL OF NATURAL RESOURCES ›› 2019, Vol. 34 ›› Issue (12): 2504-2515.doi: 10.31497/zrzyxb.20191202

• Special Forum of "Wetland" • Previous Articles     Next Articles

Impacts of tidal channels on typical landscapes of wetland in the Yellow River Delta

YU Xiao-juan1,2(), XUE Zhen-shan2, ZHANG Zhong-sheng2(), SONG Xiao-lin2, ZHANG Hong-ri1   

  1. 1. College of Geomatics, Shandong University of Science and Technology, Qingdao 266590, Shandong, China
    2. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
  • Received:2019-06-10 Revised:2019-10-08 Online:2019-12-28 Published:2019-12-28

Abstract:

Tidal channels play important roles in governing landscape succession in the estuary areas. In the present work, tidal channels and landscapes types of the Yellow River Delta (YRD) were extracted by visual interpretation based on remote sensing images combined with field investigation during 1989-2016, aiming to decipher effects of tidal channel development on Phragmites australis, Suaeda salsa and mudflats in the last 20 years through Redundancy Analysis (RDA). Results indicated that area ratio of mudflats was in the fluctuation of increase and decrease during the past 20 years, and the change trend is opposite to that of Phragmites australis and Suaeda salsa. Patch density was larger in the Northern YRD than that in the Southern YRD, and fragmentation is relatively high. RDA analysis showed that the first two sequence axes could explain about 85.7% variations of landscape indexes, which better reflected the correlation between the two. Length, number, network connectivity and curvature had greater effects on landscape features; the effect of fractal dimension was the smallest. Length, number, and fractal dimension were negatively correlated with the area ratio and patch density of Phragmites australis and Suaeda salsa while they were positively correlated with the area ratio of mudflats.

Key words: tidal channels, landscapes, RDA, Yellow River Delta