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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >The transport of aggregates associated with soil organic carbon under the rain-induced overland flow on the Chinese Loess Plateau
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The transport of aggregates associated with soil organic carbon under the rain-induced overland flow on the Chinese Loess Plateau

机译：在中国黄土高原下雨致陆地流动下与土壤有机碳相关的聚集体的运输

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Organic carbon (OC) is easily enriched in sediment particles of different sizes due to aggregate breakdown and selective transport for sheet erosion. However, the transport of aggregate-associated OC has not been thoroughly investigated. To address this issue, 27 simulated rainfall experiments were conducted in a 1 m x 0.35 m box on slope gradients of 15 degrees, 10 degrees, and 15 degrees and under three rainfall intensities of 45 mm h(-1), 90 mm h(-1) and 120 mm h(-1). The results showed that OC was obviously enriched in sediment particles of different sizes under sheet erosion. The soil organic carbon (SOC) concentrations of each aggregate size class in sediments were different from those in the original soil, especially when the rainfall intensity or slope was sufficiently low, such as 45 mm h(-1) or 5 degrees, respectively. Under a slope of 5 degrees, the SOC enrichment ratios (ERocs) of small macroaggregates and microaggregates were high but decreased over time. As rainfall intensity increased, OC became enriched in increasingly fine sediment particles. Under a rainfall intensity of 45 mm h(-1), the ERocs of the different aggregate size classes were always high throughout the entire erosion process. Under a rainfall intensity of > 45 mm h(-1) and slope of > 5 degrees, the ERocs of the different aggregate size classes were close to 1.0, especially those of clay and silt. Therefore, the high ERocs in sediments resulted from the first transport of effective clay. Among total SOC loss, the proportion of OC loss caused by the transport of microaggregates and silt plus clay-sized particles was greater than 50%. We also found that low stream power and low water depth were two requirements for the high ERocs in aggregates. Stream power was closely related to sediment particle distribution. Flow velocity was significantly and positively related to the percentage of OC-enriched macroaggregates in the sediments (P > 0.01). Our study will provide important information for
机译：有机碳（OC）由于粒度击穿和选择性运输而易于富含不同尺寸的沉积物粒子。但是，综合相关OC的运输尚未得到彻底调查。为了解决这个问题，27个模拟降雨实验在15度，10度和15度的坡度梯度的1 MX 0.35米箱中进行，在45 mm H（-1），90 mm（ - 1）和120 mm H（-1）。结果表明，OC明显富含沉积物颗粒在片侵蚀下不同尺寸的沉积物粒子。沉积物中每个聚集体尺寸类别的土壤有机碳（SoC）浓度与原始土壤中的含量不同，特别是当降雨强度或斜率足够低时，例如45mm H（-1）或5度。在5度的斜率下，小型大草种和微烧结的SoC富集比（EROC）高但随着时间的推移降低。随着降雨强度的增加，oc成富含越来越精细的沉积物粒子。在降雨强度为45mm H h（-1），在整个侵蚀过程中，不同的聚集体尺寸类的EROC总是高。在降雨强度> 45mm H（-1）和斜率> 5度的情况下，不同的聚集体尺寸类的EROC接近1.0，尤其是粘土和淤泥。因此，沉积物中的高中的沉积物是由第一次运输有效粘土的传输。在总SOC损失中，由微烧结和淤泥加上粘土粒度的运输引起的OC损耗的比例大于50％。我们还发现，低流功率和低水深是聚集体中高中的两个要求。流功率与沉积物颗粒分布密切相关。流速显着且与沉积物中富集的大草原的百分比呈正相关（P> 0.01）。我们的研究将提供重要信息

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