Fractal characteristics of soil particles in shrub-grass communities in the Chenier of the Yellow River Delta
REN Ranran1,2, XIA Jiangbao1,2, ZHANG Shuyong1, CHEN Yinping1,2, LIU Mingxin3
1. Forestry College of Shandong Agricultural University, Mountain Tai Forest Ecosystem Research Station of State Forestry and Grassland Administration, 271018, Tai'an, Shandong, China; 2. Shandong Key Laboratory of Eco-environmental Science for Yellow River Delta, Binzhou University, 256603, Binzhou, Shandong, China; 3. Weifang Linqu County Agricultural Comprehensive Development Office, 262600, Weifang, Shandong, China
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.
任冉冉, 夏江宝, 张淑勇, 陈印平, 刘明新. 黄河三角洲贝壳堤灌草群落的土壤颗粒分形特征[J]. 中国水土保持科学, 2020, 18(3): 48-58.
REN Ranran, XIA Jiangbao, ZHANG Shuyong, CHEN Yinping, LIU Mingxin. Fractal characteristics of soil particles in shrub-grass communities in the Chenier of the Yellow River Delta. SSWC, 2020, 18(3): 48-58.
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2020, Vol. 18 
