| 杨婷,吴军虎.凹凸棒土对土壤团粒结构及水力参数的影响[J].干旱地区农业研究,2017,35(6):46~51 |
| 凹凸棒土对土壤团粒结构及水力参数的影响 |
| Effect of attapulgite to soil aggregate structure and hydraulic parameters |
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| DOI：10.7606/j.issn.1000-7601.2017.06.07 |
| 中文关键词: 凹凸棒土 分形维数 土壤团粒结构 水力参数 水稳性团聚体 土壤水分特征曲线 |
| 英文关键词:attapulgite fractal dimension soil aggregate structure hydraulic parameters water stable aggregates soil moisture characteristi |
| 基金项目:国家自然科学基金重点项目(51239009)；西北旱区生态水利工程国家重点实验室培育基地科研课题(2016ZZKT-9)；陕西省教育厅科研计划项目(14JK1518)；陕西省优势学科专项资金建设项目 |
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| 中文摘要: |
| 向粉砂质壤土中均匀添加不同含量（0、10、20、30、40 g·kg-1）凹凸棒土（简称ATP）进行土壤水分特征曲线试验、土壤颗分试验及土壤团聚体试验，研究不同ATP施加量对土壤团粒结构及土壤水力参数的影响。结果表明：土壤中的黏粒（＜0.002 mm）从9.28%减小至7.06%，粉粒(0.002～0.02 mm)从50.21%减小至26.8%，砂粒(0.02～2 mm)比例从40.52%增加至41.49%；随着ATP含量增大，土壤水分特征曲线分形维数从2.859增加至2.876，土壤粒径分形维数从2.645减小至2.628，在ATP含量为30 g·kg-1时两者的分形维数均出现拐点；试验结束自然风干后的土壤大颗粒含量增加，>0.25 mm的土壤团粒随着ATP含量的增加从0增加至2；利用土壤水分特征曲线分形模型对土壤含水率进行模拟后，其模拟计算值与实测值的均方根误差RMSE在10%以内；利用非饱和土壤水力传导度分形模型对不同含量ATP非饱和水力传导度进行预测，其预测值随着ATP含量的增加整体呈减小趋势。综合分析可知，加入ATP后的土壤持水能力增强，具有改良土壤的作用，且当ATP含量为30 g·kg-1时的改良效果最佳。 |
| 英文摘要: |
| Through adding different amounts (0、10、20、30、40 g·kg-1) of attapulgite (ATP) into the silty loam, carried out the soil moisture characteristic curve test, soil grain size test and soil aggregate structure test, to study the effects of different amounts of ATP to soil aggregate structure and soil hydraulic parameters. The results showed that: The clay particles (<0.002 mm) decreased from 9.28% to 7.06%, silt particle (0.002～0.02 mm) decreased from 50.21% to 26.8%, and the sand particle (0.02～2 mm) increased from 40.52% to 41.49%. With increasing ATP content, the fractal dimension of soil water characteristic curve increased from 2.859 to 2.876, the fractal dimension of soil particle size decreased from 2.645 to 2.628, and when the ATP content was 30 g·kg-1, the two fractal dimensions total appeared the inflection point. When the test over and after the soil natural dry, the big soil particle content was increased. With increasing ATP content, the soil aggregate >0.25 mm was increased from 0 to 2. After using the fractal model of soil moisture characteristic curve to simulate the soil moisture content, the root-mean-square error RMSE between calculated values and measured values was within 10%. Using the unsaturated soil hydraulic conductivity fractal model to predict the unsaturated hydraulic conductivity by different ATP content, its predictive value assumed decrease trend with increasing ATP content. Through comprehensive analysis can be known that: After adding the ATP, the soil water holding capacity was enhanced, has possessed the function to ameliorate the soil, and when the ATP content was 30 g·kg-1, the ameliorated effect will be optimum. |
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