| .风沙土不同粒径微团聚体对氨氮的富集特征[J].农业环境科学学报,2013,32(2):. |
| 风沙土不同粒径微团聚体对氨氮的富集特征 |
| Enrichment Characteristic of Ammonia-Nitrogen on Different Grain Sizes Micro-Aggregate of Sandy Soil |
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| DOI：10.11654/jaes.2013.02.016 |
| 中文关键词: 风沙土 微团聚体 粒径 氨氮 吸附分配系数 富集系数 |
| 英文关键词: sandy soil micro-aggregate grain sizes ammonia-nitrogen partition coefficient enrichment ratio |
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| 中文摘要: |
| 风沙土是易发生溅蚀和水土流失严重的土类，为估算风沙土吸附态氨氮流失量，采用平衡吸附法研究了风沙土不同粒径微团聚体对氨氮的富集特征。结果表明，风沙土中微团聚体对氨氮具有富集作用。其原因有二：细粒级微团聚体中腐殖质含量高于粗粒级；细粒级微团聚体中有机质是通过可溶有机质与黏土矿物相互结合形成复合体而富集。黏粒和粉粒中的稳结态腐殖质占Ht比例相对高于其他粒级，稳结态腐殖质是形成复合体团聚结构的重要胶结物质，在复合体团聚结构中存在的孔隙填充方式氨氮吸附是导致黏粒级和粉粒级微团聚体对氨氮产生富集作用的原因；团聚体对氨氮的富集系数与腐殖质总量呈极显著正相关（R2＝0.909），与稳结态腐殖质含量呈极显著正相关（R2＝0.902）；西辽河流域风沙土在暴雨径流中黏粒级和粉粒级冲泻质泥沙所携载的吸附态氨氮质量分数可分别按3 641.49、2 617.52 mg· kg-1估算，黏粒和粉粒级微团聚体的富集系数可分别按1.65和1.18计算。 |
| 英文摘要: |
| Splash erosion and soil and water loss was liable to occur in sandy soil. Enrichment characteristic of ammonia-nitrogen on different grain sizes micro-aggregate of sandy soil was investigated by batch experiments of equilibrium adsorption in order to estimate the loss flux of its adsorption state. Results indicated that the enrichment effect on ammonia-nitrogen was attributed greatly to micro-aggregate of sandy soil. Firstly, humus content of fine grain size aggregate was higher than that of coarse grain size aggregate. Secondly, organic matter of fine grain size aggregate was enriched by clay mineral, which was combined with dissoluble organic matter. The content of stably combined humus in clay or silt was higher relatively, and there was a micro-hole filling function in ammonium-nitrogen sorption on complex. Stably combined humus is an important adhesive material in the formation of organo-mineral complex. Micro-hole filling mechanism was the cause of enrichment of ammonia-nitrogen on different grain sizes micro-aggregate. Furthermore, there was a highly obvious positive correlation between enrichment ratio and total humus content（R2=0.909）, and so was it with stably combined humus content（R2=0.902）. Consequently, mass percentages of adsorption state ammonia-nitrogen carried by clay and silt from West Liao River sandy soil under rainfall condition were estimated in accordance with 3 641.49 mg·kg-1 and 2 617.52 mg·kg-1 respectively, and enrichment ratios of clay and silt were estimated in accordance with 1.65 and 1.18 respectively. |
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