黄河三角洲贝壳堤灌草群落的土壤颗粒分形特征

doi:10.16843/j.sswc.2020.03.006

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Abstract [Background] In order to reveal the fractal characteristics of soil grains and its influencing factors of typical shrub-grass communities in the Chenier of the Yellow River Delta, the three shrub-grass vegetation types of Ziziphus jujuba var. spinosa-Artemisia mongolica shrub-grass community, Periploca sepium Bunge-Messerschmidia sibirica shrub-grass community and A. mongolica-Phragmites australis herb community were taken as the research objects.[Methods] Based on the 3 typical shrub-grass communities with consistent habitat conditions, and used the bare land in the same section as a control, we selected 3 sample plots (10 m×10 m) for each shrub-grass community and bare land, and collected soil samples of 0 -10 and 10-20 cm soil layers with 5-point method, and 5 samples of each type of shrub-grass community and bare land were mixed in layers and used as experimental samples. The different shrub-grass communities of soil particle size distribution, monofractal and multifractal characteristics were measured by laser diffraction analysis technique. Excel was used to obtain the fractal parameter (D,D₀,D₁, and D₂)[Results] 1) The shell sands of typical shrub-grass communities showed non-uniform distribution and obvious heterogeneity. The monofractal dimension (D) of shell sand ranged from 1.411 to 2.490. The values were in a descending order of Z. jujuba var. spinosa-A. mongolica shrub-grass community, P. sepium Bunge-M. sibirica shrub-grass community, bare land and A. mongolica-P. australis herb community. The content of fine particles in 10-20 cm soil layer in each type was 53.5%, 53.6%, 27.2% and 153% higher than that in 0-10 cm soil layer, respectively. 2) There was a significant difference between different soil layers of the same shrub-grass community (P<0.05). The D value of 0-10 cm soil layer was less than that of 10-20 cm. There were significant differences in volumn dimension (D₀), information entropy dimension (D₁), correlation dimension (D₂), D₁/D₀ and D₀-D₁ among different soil layers in different shrub-grass communities (P<0.05). 3) Generally, the heterogeneity of shell sand in the 10-20 cm soil layer of the Z. jujuba var. spinosa-A. mongolica shrub-grass community was the highest, while the uniformity of shell sand distribution was the highest. Compared with other shrub communities, the degree of sand dispersion in the 10-20 cm layer of Z. jujuba var. spinosa-A. mongolica shrub-grass community, the 0-10 layer of P. sepium Bunge-M. sibirica shrub-grass community and 10-20 cm layer of the A. mongolica-P. australis herb community was small, and the uniformity of dense area was better. D₀ had a significant positive correlation with the volume fraction of clay, silt and very fine sand grains (P<0.05). When the content of clay was 0, the shell sand did not have multifractal characteristic. D₀ can be used as an indicative parameter to characterize the particle size distribution of shell sand.[Conculsions] Z. jujuba var. spinosa-A. mongolica shrub-grass community may improve soil structure better than P. sepium Bunge-M. sibirica shrub-grass community does,and A. mongolica-P. australis herb community does worse. The improvement in the soil layer of 10-20 cm is better than that of 0-10 cm layer. Increasing the number of shrub-grass communities in the Yellow River Delta is beneficial to improving the content of fine-grained material, and it is significant for vegetation to improve soil particle size composition.

Key words： shell sand monofractal multifractal shrub-grass type the Yellow River Delta

Received: 25 September 2018

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S152

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	REN Ranran
	XIA Jiangbao
	ZHANG Shuyong
	CHEN Yinping
	LIU Mingxin

Cite this article:

REN Ranran,XIA Jiangbao,ZHANG Shuyong, et al. Fractal characteristics of soil particles in shrub-grass communities in the Chenier of the Yellow River Delta[J]. SSWC, 2020, 18(3): 48-58.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2020.03.006 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2020/V18/I3/48

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