| Fractal characteristics of soil particles in sand\|fixing forests of Habahu National Nature Reserve |
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| DOI：10.7606/j.issn.1000-7601.2020.01.28 |
| Key Words: soil particles fractal dimension sand\|fixing forests soil environmental evolution indicator Habahu National Nature Reserve |
| Author Name | Affiliation | | HE Jianlong | Ningxia Key Laboratory of Desertification Control and Soil and Water Conservation, Institute of Desertification Control, Ningxia Academy of Agriculture and Forestry Science, Yinchuan, Ningxia 750002, China | | JIANG Qi | Ningxia Key Laboratory of Desertification Control and Soil and Water Conservation, Institute of Desertification Control, Ningxia Academy of Agriculture and Forestry Science, Yinchuan, Ningxia 750002, China | | WU Xudong | Ningxia Key Laboratory of Desertification Control and Soil and Water Conservation, Institute of Desertification Control, Ningxia Academy of Agriculture and Forestry Science, Yinchuan, Ningxia 750002, China | | WANG Zhanjun | Ningxia Key Laboratory of Desertification Control and Soil and Water Conservation, Institute of Desertification Control, Ningxia Academy of Agriculture and Forestry Science, Yinchuan, Ningxia 750002, China | | YOU Wanxue | Ningxia Habahu National Nature Reserve Administration, Yanchi, Ningxia 751500, China | | YANG Lijin | Ningxia Habahu National Nature Reserve Administration, Yanchi, Ningxia 751500, China |
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| Abstract: |
| In order to scientifically evaluate the impact of vegetation restoration on soil texture of desert soil reversal, 5 desert ecosystems including mobile sand dune (CK), Artemisia ordosica fixed sand (AF), Populus simonii fixed sand (PF), and Salix cheilophila fixed sand (SF), were studied. The soil particle composition, soil nutrient characteristics, and their correlations in different sand\|fixing forests were analyzed. The results showed that the soil particle composition of the sand\|fixing forests were mainly composed of 50~250 μm fine sands, and AF significantly increased the soil clay content and soil particle volume fractal dimension of 0~10 cm soil layer (P<0.01). The fractal dimension was ranked as AF>PF>CK>SF and the fractal dimension difference of each sand\|fixing forest was extremely significant (P<0.01). Correlation analysis showed that the higher the clay particle content, the larger the fractal dimension and the better the soil physical stability. Fractal dimension was significantly positively correlated with soil organic matter, total nitrogen, and total phosphorus at 0.01 level, but significantly negatively correlated with fine sand volume percentage (P<0.01). Soil particle fractal dimension D increased by 1, soil organic matter, total nitrogen, and total phosphorus increased by 2.80, 0.13 g·kg-1, and 0.10 g·kg-1, respectively. Therefore, fractal dimension can be used as a comprehensive index to characterize the soil texture change of dune and sandstone soil environment after sand fixation in plantation. |
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