Water erosion on agricultural land preferentially carries away fine particles. Due to the generally high specific density of sorption sites of these particles, their displacement can be associated with substantial particle-bound transfer also of nutrients and pollutants with low solubility. Organic matter amendments can reduce soil erosion, but to what extent they affect the erosion-induced element losses has not been studied much. Here, we carried out field rainfall experiments on three pairs of soil plots (1.5 × 0.75 m) after incorporating a mixture of wheat straw and grass (2.12 g C per kg soil) as organic amendment into the topsoil (0–5 cm depth) of one plot in each pair (OI treatment). The other plot was prepared in the same way but without incorporation of the amendment (NI treatment). Artificial rainfall (49.1 mm h^− 1) was simultaneously applied on each pair of plots for approximately 2 h, and sediment samples were collected at designated time steps for the analyses of C, N, P, Cu, Zn and stable carbon isotope ratios. The organic amendment substantially reduced element losses, but to a lesser extent than soil loss, as the element concentrations were higher in the exported sediments in the OI than in the NI treatment. With and without organic amendment, the concentrations of the studied elements were consistently higher in the exported sediments than in the bulk soil. They were always maximal at the onset of discharge and then continuously decreased towards the values of the bulk soil. The δ¹³C values revealed that the eroded C was preferentially derived from the fresh organic residue added to the soil. Pairwise correlations between elements and sediment size indicate that the export of N, Cu and Zn was primarily associated with soil organic matter loss, whereas P export was more associated with mineral fractions.

农业土地上的水蚀会优先带走细小颗粒。由于这些颗粒的吸附位点通常具有较高的比密度，因此它们的位移可能与低溶解性的营养物和污染物的大量颗粒结合转移有关。有机质改良剂可以减少土壤侵蚀，但是在多大程度上影响了侵蚀引起的元素损失，人们对此研究还很少。在这里，我们将小麦秸秆和草的混合物（每公斤土壤2.12 g C）作为有机改良剂掺入表土（0-5 cm深度）后，对三对土壤样地（1.5×0.75 m）进行了田间降雨试验。每对中有一个地块的面积（OI处理）。另一块地块以相同的方式准备，但未纳入修正案（NI处理）。人工降雨（49.1毫米小时^{− 1}）同时在每对样地上放置约2 h，并在指定的时间步长收集沉积物样品，以分析C，N，P，Cu，Zn和稳定的碳同位素比。有机改性剂可显着减少元素损失，但程度要比土壤损失小，因为OI中出口沉积物中的元素浓度高于NI处理。在有或没有有机修饰的情况下，出口沉积物中所研究元素的浓度始终高于散装土壤中的浓度。它们在排放开始时始终是最大的，然后朝着散装土壤的值不断降低。该δ ¹³C值表明被侵蚀的C优选地来自添加到土壤中的新鲜有机残余物。元素与沉积物大小之间的成对相关性表明，氮，铜和锌的出口主要与土壤有机质的流失有关，而磷的出口与矿质含量的关系更大。