Sediments and spatial pattern characteristics of Vitex trifolia nebkhas in the Houtian sandy land of Nanchang, China
Received date: 2022-02-23
Revised date: 2022-04-22
Online published: 2023-01-09
In order to explore the characteristics of nebkhas at different evolution stages and their interaction with the environment in subtropical humid regions, field investigations and researchs were carried out with the Vitex trifolia nebkhas in the Houtian sandy land of Nanchang City as the research object. The morphological parameters of the nebkhas in each evolutionary stage were measured in the field to analyze the morphological characteristics, the surface sediments of different geomorphological positions were sampled to analyze the grain size characteristics, and the location was recorded through field positioning and remote sensing satellite images to analyze the spatial distribution pattern of nebkhas. The results showed that the nebkhas in the Houtian sandy land were mainly in the stable stage and accounting for 58.82%, followed by the recession stage and accounting for 36.90%, the developing stage was the least and accounting for only 4.28%, the basic morphological parameters of the nebkhas are stable stage>recession stage>developing stage. The sediments on the surface of the nebkha are characterized by more fine particles in the stable stage, more coarse particles in the developing stage, and intermediate in the recession stage. The average particle size is the finer in the stable stage which is 1.86 Ф, followed by the recession stage which is 1.75 Ф, and the coarsest in the developing stage which is 1.67 Ф; from the top-middle-edge-interdune of the nebkha, the average particle size of the sediments in the stable and recession stages gradually becomes coarser, and there is no obvious change trend in the developing stage. The nebkhas as a whole presented the aggregated distribution on most distance scales; among the nebkhas in each evolution stage, the nebkhas between the developing stage and other stages have no correlation at each distance scale, the stable and recession stages presented a positive correlation on the small and medium distance scales. Reflecting the interdependence and group effect between the main nebkhas in the Houtian sandy land.
Xiangjie Li , Zhiwen Li , Dingding Du , Li Sun , Chu Hou , Shiqian Li , Wen Zhang . Sediments and spatial pattern characteristics of Vitex trifolia nebkhas in the Houtian sandy land of Nanchang, China[J]. Journal of Desert Research, 2022 , 42(6) : 211 -220 . DOI: 10.7522/j.issn.1000-694X.2022.00075
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