Globally, replanted sugarcane (Rp) on hillslopes has accelerated soil erosion and associated nutrients entering the river, causing serious water pollution. Sugarcane planting patterns (SPPs), including the area ratios of Rp and intercropping (Ic) on the hillslopes, may mitigate these negative impacts by increasing surface coverage. But the effectiveness of SPPs on these impacts has not been quantified at both hillslopes and watershed scale. We measured extreme rainfall erosion-induced nutrients losses on the upslopes with different area ratios of Rp and the deposition ratio on the downslopes with different Ic levels by using beryllium-7 (⁷Be) technique. We estimated the export loads and coefficients of eroding sediment nutrients from the watersheds with different spatial configuration of Rp and Ic levels by combinative use of ⁷Be, compound-specific stable isotope (CSSI) and watershed monitoring. Nitrogen (N) and phosphorus (P) loss increased with area ratios of Rp, ranging from 6.9 to 21.2 kg ha⁻¹ event⁻¹ and 2.8–9.6 kg ha⁻¹ event⁻¹, respectively. Delivery ratios of eroding nutrients from the upslopes decreased with intercropping levels on the downslopes, ranging between 38.0% and 49.6%. Export loads and coefficient of eroding nutrients varied with the spatial configuration of Rp ratios and Ic levels in the watershed, ranging from 0.04 kg ha⁻¹ to 1.76 kg ha⁻¹ and 1.09–25.15%, respectively. The magnitudes of sediment nutrient losses on the upslope were positively correlated with area ratios of Rp (P < 0.05), whereas their delivery ratios on the downslope were negatively correlated with Ic levels, although they were not statistically significant (P > 0.05). The changes in ground litter cover (Glc) caused by Rp and Ic explained the variations of 53.6–55.3% in nutrient loss rate and of 74.1–74.4% in nutrient delivery ratio. Our results suggest that regulating SPPs could effectively mitigate erosion-induced nitrogen and phosphorus loss on the slopes and their export loads from the watershed.

在全球范围内，在山坡上重新种植甘蔗（Rp）加速了土壤侵蚀和相关营养物质进入河流，造成严重的水污染。甘蔗种植模式 (SPP)，包括山坡上 Rp 和间作 (Ic) 的面积比，可以通过增加地表覆盖率来减轻这些负面影响。但 SPP 对这些影响的有效性尚未在山坡和流域尺度上进行量化。我们用铍7（⁷是）技术。^{我们通过结合使用7} Be、化合物特异性稳定同位素 (CSSI) 和流域监测，估算了具有不同 Rp 和 Ic 水平空间配置的流域沉积物养分的输出负荷和侵蚀系数。氮 (N) 和磷 (P) 损失随着 Rp 的面积比而增加，范围分别为 6.9 至 21.2 kg ha ^-1事件^-1和 2.8-9.6 kg ha ^-1事件^-1。上坡侵蚀养分输送率随下坡间作水平下降，下降幅度在38.0%~49.6%之间。输出负荷和侵蚀养分系数随流域 Rp 比率和 Ic 水平的空间配置而变化，范围从 0.04 kg ha^-1至 1.76 kg ha ^-1和 1.09–25.15%，分别。上坡泥沙养分流失量与Rp面积比呈正相关（P  < 0.05），下坡泥沙养分流失量与Ic水平呈负相关，但差异无统计学意义（P  > 0.05）。由 Rp 和 Ic 引起的地面凋落物覆盖 (Glc) 变化解释了养分流失率 53.6-55.3% 和养分输送率 74.1-74.4% 的变化。我们的研究结果表明，调节 SPPs 可以有效地减轻侵蚀引起的斜坡上的氮和磷损失及其从流域的输出负荷。