Physical and Chemical Properties of Eroded Soil Aggregates
Physical and Chemical Properties of Eroded Soil Aggregates
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DOI：
10.13031/2013.33959
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发表时间：
1983
影响因子：
1.5
通讯作者：
E. Alberts;R. C. Wendt;R. F. Piest
中科院分区：
文献类型：
--
作者：
E. Alberts;R. C. Wendt;R. F. Piest
采用降雨模拟方法对爱荷华州西南部2个黄土侵蚀样地的团聚体侵蚀特征进行了评价。当基质中含26%粘土和1.9%碳、22%粘土和0.8%碳时，沟间侵蚀的平均团粒直径（D50）分别为44和34 ^m。随着钻孔的发生，D50粒径逐渐增大，但不同土壤的D50粒径增大的幅度不同。高黏度土壤的D50粒径增加了91%，而其他土壤仅增加了15%。当作为一个单独的组分分析时，直径bbb50 ^m的侵蚀团聚体比直径bbb50 ^m的团聚体含有更多的粘土和总氮。与基质土相比，>50-/im团聚体的粘土和氮含量也较丰富。由于颗粒在运移过程中具有更大的选择性，因此细沟间的富集程度大于细沟加细沟侵蚀。平衡磷浓度曲线随团聚体粒径的变化而变化，表明250 ~ 50 μ m团聚体在缓冲可溶性磷水平和运输活性磷方面比大团聚体更重要。
RAINFALL simulation was used to evaluate the characteristics of aggregates eroded from erosion plots on two loess soils in southwestern Iowa. The mean aggregate diameters (D50) for interrill erosion were 44 and 34 ^m for soils with 26% clay and 1.9% carbon and 22% clay and 0.8% carbon in their matrix, respectively. The D50 size increased as rilling occurred, but the percentage of increase was quite different for the soils. The D50 size increased by 91% for the soil with higher clay, whereas it increased by only 15% for the other soil. The eroded aggregates >50 ^m in diameter contained more clay and total nitrogen than did the aggregates im, when analyzed as a single fraction. The >50-/im aggregates were also enriched in clay and nitrogen when their contents were compared to those of the matrix soil. Enrichment was greater for interrill than for interrill plus rill erosion because of greater particle selectivity during the transport process. Equilibrium phosphorus concentration curves varied with aggregate size, suggesting that 250 to 50-jum aggregates are of greater importance in buffering soluble P levels and transporting labile P than larger aggregates...