| 摘要: |
| [目的]研究土壤团粒分形维数及其与团粒基本特征之间的关系,为防止土壤退化及减少土壤侵蚀提供理论指导.[方法]在黄土残塬沟壑区,利用分形理论对刺槐纯林、油松纯林、侧柏纯林3种纯林和油松×刺槐、油松×侧柏、油松×狼牙刺3种混交林林地及天然草地土壤表层团粒的分形特征进行了分析.[结果]刺槐纯林土壤团粒分形维数最小;0～10 cm土层土壤分形维数为2.252 5～2.757,与>5 mm和0.5～2 mm两粒级土壤团粒含量呈极显著相关,与其他粒级土壤团粒含量相关性不显著;10～20 cm土壤团粒分形维数为2.529 4～2.701 7,与>5 mm粒级团粒含量呈显著性负相关,与其他粒级土壤团粒含量相关性不显著.[结论]土壤团粒分形维数与粒径>0.25mm土壤水稳性团粒总量、稳定性系数、重量平均粒径、几何平均粒径均呈负相关. |
| 关键词: 人工林 土壤团粒 水稳性团粒 分形维数 |
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| 基金项目:国家自然科学基金项目(30471376)；西北农林科技大学2005年人才计划项目 |
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| Fractal features of soil aggregate under different artificial forests and their relationships with main aggregate prosperities in Gullied Loess Plateau |
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| Abstract: |
| 【Objective】 The research is to study the fractal features of soil aggregate and their relationship with the main aggregate prosperities to provide theoretical instruction for preventing the soil degeneration and reducing soil erosion. 【Method】 Based on the fractal theory,the fractal dimension of soil aggregate of six artificial forests and natural meadow in Gullied Loess Plateau was analyzed. 【Result】 Results show that the fractal dimension of soil aggregate in pure stands of black locust is the smallest.The fractal dimension of layer 0-10 cm ranged from 2.2525 to 2.757,and the correlation between the total quantity the aggregate of >5 mm and 0.5-2 mm was very significantly,but not significant to others.The fractal dimension of soil aggregate of layer 10-20 cm ranged form 2.5294 to 2.7017,and it was significantly negative correlated to the total amount aggregate of >5 mm,but not significant to others.【Conclusion】 There was remarkable negative correlation between the fractal dimension of soil aggregate and the total amount water-stable aggregate of >0.25 mm,ASI (aggregate stability index),MWD (mean weight diameter) and GMD (geography mean diameter). |
| Key words: artificial forest soil aggregate water-stable aggregate fractal dimension |
