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Characteristics of Soil and Organic Carbon Loss Induced by Water Erosion on the Loess Plateau in China

机译：黄土高原水蚀引起的土壤和有机碳损失特征

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摘要

Soil erosion has been a common environmental problem in the Loess Plateau in China. This study aims to better understand the losses of soil organic carbon (SOC) induced by water erosion. -simulated rainfall experiments were conducted to investigate the characteristics of SOC loss induced by water erosion. The applied treatments included two rainfall intensities (90 and 120 mm h-1), four slope gradients (10°, 15°, 20°, and 25°), and two typical soil types- silty clay loam and silty loam. Results showed that the sediment OC enrichment ratios (ERoc) in all the events were relative stable with values ranged from 0.85 to1.21 and 0.64 to 1.52 and mean values of 0.98 and 1.01 for silty clay loam and silty loam, respectively. Similar to the ERoc, the proportions of different sized particles in sediment showed tiny variations during erosion processes. No significant correlation was observed between ERoc values and the proportions of sediment particles. Slope, rainfall intensity and soil type almost had no impact on ERoc. These results indicate that the transportation of SOC during erosion processes was nonselective. While the mean SOC loss rates for the events of silty clay loam and silty loam were 0.30 and 0.08 g m-2 min-1, respectively. Greater differences in SOC loss rates were found in events among different soil types. Meanwhile, significant correlations between SOC loss and soil loss for all the events were observed. These results indicated that the amount of SOC loss was influenced primarily by soil loss and the SOC content of the original soil. Erosion pattern and original SOC content are two main factors by which different soils can influence SOC loss. It seems that soil type has a greater impact on SOC loss than rainfall characteristics on the Loess Plateau of China. However, more kinds of soils should be further studied due to the special formation processes in the Loess Plateau.
机译：在中国黄土高原地区，土壤侵蚀一直是一个普遍的环境问题。这项研究旨在更好地了解水蚀引起的土壤有机碳（SOC）的损失。进行了模拟降雨实验，研究了水蚀引起的SOC损失特征。应用的处理方法包括两种降雨强度（90和120 mm h -1 ），四个坡度梯度（10°，15°，20°和25°）以及两种典型的土壤类型-粉质粘土壤土和粉质壤土。结果表明，在所有事件中，沉积物OC富集率（ERoc）相对稳定，粉质黏土壤土和粉质壤土的平均值分别为0.85至1.21和0.64至1.52，平均值分别为0.98和1.01。与ERoc相似，在侵蚀过程中，沉积物中不同大小颗粒的比例显示出微小的变化。 ERoc值与沉积物颗粒比例之间没有显着相关性。坡度，降雨强度和土壤类型对ERoc几乎没有影响。这些结果表明，在侵蚀过程中，SOC的迁移是非选择性的。粉质壤土和粉质壤土事件的平均SOC损失率分别为0.30和0.08 g m -2 min -1 。在不同土壤类型之间的事件中，SOC损失率差异更大。同时，在所有事件中，SOC损失与土壤损失之间都存在显着的相关性。这些结果表明，SOC的损失量主要受土壤损失和原始土壤的SOC含量的影响。侵蚀方式和原始SOC含量是影响土壤损失的两个主要因素。在中国黄土高原地区，土壤类型对SOC损失的影响似乎大于降雨特征。然而，由于黄土高原地区特殊的形成过程，更多的土壤类型需要进一步研究。

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