| 何建龙,蒋齐,吴旭东,王占军,尤万学,杨立瑾.哈巴湖国家级自然保护区固沙林地土壤颗粒分形特征[J].干旱地区农业研究,2020,38(1):217~222 |
| 哈巴湖国家级自然保护区固沙林地土壤颗粒分形特征 |
| 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 |
| 中文关键词: 土壤颗粒 分形维数 固沙林地 哈巴湖自然保护区 |
| 英文关键词:soil particles fractal dimension sand\|fixing forests soil environmental evolution indicator Habahu National Nature Reserve |
| 基金项目:世界银行贷款项目（NX-ZX-02）；国家重点研发计划课题（2016YFC0400305） |
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| 中文摘要: |
| 为科学评价植被恢复促进沙漠化逆转对土壤质地的影响，以流动沙地（CK）、黑沙蒿林地(AF)、杨树林地(PF)及沙柳林地(SF)荒漠生态系统为研究对象，分析不同固沙林地土壤颗粒组成、土壤养分特征及其相关性。结果表明：固沙林地土壤颗粒组成主要以50～250 μm的细沙粒为主，AF显著提高了0～10 cm土层土壤黏粉粒含量和土壤颗粒体积分形维数（P＜0.01），分形维数表现为AF＞PF＞CK＞SF，各固沙林地间分形维数差异极显著（P＜0.01）；相关性分析表明，黏粉粒含量越高，分形维数越大，土壤物理稳定性越好；分形维数与土壤有机质、全氮和全磷含量极显著正相关，与细砂粒体积百分比极显著负相关，土壤颗粒分形维数D值每增加1，土壤有机质、全氮和全磷含量分别增加2.80、0.13 g·kg-1和0.10 g·kg-1。分形维数可以作为表征人工林固沙后沙丘土壤质地变化和沙丘土壤环境演变的敏感性综合指标。 |
| 英文摘要: |
| 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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