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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Zonal characteristics of sediment-bound organic carbon loss during water erosion: A case study of four typical loess soils in Shaanxi Province
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Zonal characteristics of sediment-bound organic carbon loss during water erosion: A case study of four typical loess soils in Shaanxi Province

机译：水蚀过程中沉积物有机碳损失的区域特征 - 以陕西省四种典型黄土污染为例

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摘要

The soils of the Loess Plateau of China exhibit zonal characteristics, with declining clay percentages from the southern to northern regions. However, these differences have been largely ignored in studies of soil erosion and the related organic carbon (OC) loss. The goal of this study was to investigate the effect of gradual changes in soil texture on the loss and selective transport of soil and soil organic carbon (SOC) on the Loess Plateau of China. Four typical soils with decreasing clay contents (26.3%, 21.2%, 15.6% and 12.1%) in Shaanxi Province were selected and studied. Rainfall-simulated experiments were performed in 1 m (width) x 5 m (length) plots with a rainfall intensity of 120 mm h(-1) on three slope gradients (15, 20 and 25). The runoff and sediment yields, particle size distributions of the sediments, OC concentrations and enrichment ratios of OC in sediment (ERoc) during rainfall processes were measured and calculated. A comparison of the rainfall characteristics between rainfall events in different soils indicated that a decrease in the clay percentage increased the intensity of rill erosion. The runoff rates of different events decreased with the clay percentage, whereas no general pattern was observed in the sediment yield rate due to differences in the initial timing and intensity of rill erosion. Furthermore, the ERoc values in the sediments of all the events were between 0.64 and 1.44, with 90% of values between 0.80 and 1.20. Similarly, the effective particle size distribution of the sediments exhibited relatively constant values with rainfall duration. Non-significant correlations (P > 0.05) between ERoc and dispersed and non-dispersed sediment particles suggested that the transport of sediment and OC was non-selective. Moreover, significant linear correlations were observed between the amount of SOC loss and sediments in all the events. However, there was no significant difference in total SOC loss between the rainfall events, except for in events with a soil clay percentage of 15.6%. SOC losses in soils with 26.3% and 21.2% clay percentages were mainly due to the high SOC concentrations of the original soils, whereas those in other soils were due to the large amount of lost sediment. However, the variations in soil loss and SOC loss were not associated with changes in the clay content of the soil. These results suggest that zonal soils with decreasing clay contents do not influence the selective transport of OC, but soil textures affect the sediment and SOC loss through complicated mechanisms.
机译：中国黄土高原的土壤表现出撒蒙特征，克莱百分比从南部到北部地区的百分比下降。然而，在土壤侵蚀和相关的有机碳（OC）损失的研究中，这些差异在很大程度上被忽略了。本研究的目标是探讨土壤质地逐渐变化对中国黄土高原土壤土壤有机碳（SOC）丧失和选择性运输的影响。选择并研究了陕西省含量减少的四种典型土壤（26.3％，21.2％，15.6％和12.1％）。在三个斜率梯度（15,20和25）上，在1米（宽度）×5M（长度）图中进行降雨模拟实验，其降雨强度为120mm H（-1）（15,20和25）。测量并计算径流和沉积物产量，沉积物，OC在沉积物（EROC）中沉积物（EC）的粒度分布，沉积物（EROC）的浓缩比。不同土壤中降雨事件之间的降雨特征的比较表明，粘土百分比下降增加了胚胎腐蚀的强度。不同事件的径流率随着粘土百分比减少，而由于雨腐蚀的初始时序和强度差异，在沉积物屈服率下没有观察到一般模式。此外，所有事件的沉积物中的EROC值在0.64和1.44之间，其中90％的值在0.80和1.20之间。类似地，沉积物的有效粒度分布显示出持续降雨的持续时间相对恒定的值。 EROC和分散和非分散沉积物颗粒之间的非显着相关性（P> 0.05）表明沉积物和OC的运输是非选择性的。此外，在所有事件中的SoC损失和沉积物的量之间观察到了显着的线性相关性。然而，降雨事件之间的总体SOC损失没有显着差异，除了土壤粘土百分比为15.6％的事件。土壤中的SOC损失为26.3％和21.2％的粘土百分比主要是由于原始土壤的高SOC浓度，而其他土壤的损失是由于大量沉积物。然而，土壤损失和SOC损失的变化与土壤的粘土含量的变化无关。这些结果表明，粘土含量下降的区域土壤不会影响OC的选择性运输，但通过复杂机制影响沉积物和SOC损失。

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