Sediments and spatial pattern characteristics of Vitex trifolia nebkhas in the Houtian sandy land of Nanchang， China

doi:10.7522/j.issn.1000-694X.2022.00075

Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (6): 211-220.DOI: 10.7522/j.issn.1000-694X.2022.00075

Sediments and spatial pattern characteristics of Vitex trifolia nebkhas in the Houtian sandy land of Nanchang， China

Xiangjie Li¹^,²^,⁴(), Zhiwen Li²^,³(), Dingding Du², Li Sun²^,³, Chu Hou², Shiqian Li², Wen Zhang²

^1.Institute of Geographic Sciences and Natural Resources Research，Chinese Academy of Sciences，Beijing 100101，China
^2.School of Earth Science，East China University of Technology，Nanchang 330013，China
^3.School of Environmental and Chemical Engineering，Foshan University，Foshan 528225，Guangdong，China
^4.University of Chinese Academy of Sciences，Beijing 100049，China

Received:2022-02-23 Revised:2022-04-22 Online:2022-11-20 Published:2023-01-09
Contact: Zhiwen Li

Abstract

Abstract:

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.

Key words: Houtian sandy land, nebkhas, developmental stage, sediments, spatial distribution pattern

CLC Number:

S152.3

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.

Figures/Tables 10

Fig.1 Location and satellite imagery of the Houtian sandy land

Table 1 The morphology characteristics of Vitex trifolia nebkhas in different evolution stages

演化阶段	形态特征	植被特征	土壤表皮特征	调查数量
发育阶段	锥形或半椭球形	植被单株或多株生长，迎风坡植被少，背风坡植被多且长势好	迎风坡为流沙，背风坡表层有部分结皮	8
稳定阶段	半椭球形或盾形	植被多株生长且长势较好，迎风坡植被盖度略小于背风坡	迎风坡和背风坡均有结皮，且结皮较厚、坚固	110
衰退阶段	盾形或不规则形	植被多株生长但长势较差，枯枝较多，两侧盖度相近	部分结皮风蚀破裂，有流沙出现	69

Fig.2 Schematic diagram of Vitex trifolia nebkhas in different evolution stages

Fig.3 Sketch of morphological parameters of nebkhas

Fig.4 Sampling points of sediments in various geomorphological positions of nebkhas

Fig.5 Distribution frequency and morphological parameters of nebkhas in each developmental stage

Fig.6 Average particle size （A） and grain size distribution （B） of the sediments in each developmental stage of the nebkhas

Fig.7 Grain size distribution of sediments in different geomorphological positions in each developmental stage of nebkhas

Fig.8 Spatial distribution of nebkhas in each developmental stage

Fig.9 Spatial pattern characteristics of nebkhas in different distance scales

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Sediments and spatial pattern characteristics of Vitex trifolia nebkhas in the Houtian sandy land of Nanchang， China

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