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首页> 外文期刊>土壤圈（英文版） >Aggregate Stability and Its Relationship with Some Chemical Properties of Red Soils in Subtropical China
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Aggregate Stability and Its Relationship with Some Chemical Properties of Red Soils in Subtropical China

机译：亚热带红壤团聚体稳定性及其与某些化学性质的关系

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摘要

The stability of aggregates in the surface soil is crucial to soil erosion and runoff generation. Thus, to understand the stability and the breakdown mechanisms of soil aggregates as well as the relationship between aggregate stability and selected soil chemical properties, such as different forms of Fe and Al oxides, organic matter, CEC and clay content, the aggregates of slightly and severely eroded red soils derived from Quaternary red clay in subtropical China were analyzed using the routine wet sieving and the Le Bissonnais methods. The results indicated that the aggregates of the severely eroded soils were more stable than those of the slightly eroded soils. Different aggregate breakdown mechanisms resulted in different particle size distribution. The slaking from entrapped air in aggregates severely destroyed the soil aggregates,especially in the slightly eroded soils. Meanwhile, mechanical breakdown and microcracking had little effect on the aggregates compared to slaking. The fragments resulting from slaking were mainly microaggregates that increased in size with increasing clay content. The main fragment size of the slightly eroded soils was 1.0-0.2 mm, while for the severely eroded soils it was 5.0-2.0 mm and 1.0-0.5 mm. Overall, more than 20% of the fragments were smaller than 0.2 mm.In addition, aggregate stability was positively and often significantly correlated with Fed, Ald, Feo and clay content, but significantly and negatively correlated to SOC.
机译：表土中骨料的稳定性对土壤侵蚀和径流的产生至关重要。因此，要了解土壤团聚体的稳定性和破坏机理，以及团聚体稳定性与选定的土壤化学性质之间的关系，例如不同形式的铁和铝氧化物，有机物，CEC和粘土含量，轻度和短时的团聚体。使用常规湿筛和Le Bissonnais方法分析了亚热带第四纪红黏土产生的严重侵蚀的红壤。结果表明，严重侵蚀土壤的团聚体比轻微侵蚀土壤的团聚体更稳定。不同的聚集体分解机理导致不同的粒度分布。团聚体中夹带的空气中的残渣严重破坏了土壤团聚体，特别是在侵蚀较轻的土壤中。同时，与分解相比，机械分解和微裂纹对骨料的影响很小。碎裂产生的碎片主要是微骨料，其尺寸随粘土含量的增加而增加。轻度侵蚀土壤的主要碎片大小为1.0-0.2毫米，重度侵蚀土壤的主要碎片大小为5.0-2.0毫米和1.0-0.5毫米。总体而言，超过20％的碎片小于0.2 mm。此外，集料的稳定性与Fed，Ald，Feo和粘土含量呈正相关，通常与SOC呈显着负相关。

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