Biochar amendment technique having been applied in the landfill cover or green roof was found to have the potential of erosion control. The strategy of utilizing excess biomass resource from an invasive weed (water hyacinth) in China and converting it into a new type of biochar is proposed to address the erosion issue. It is noted that the erosion process influenced by multiple factors (i.e., slope conditions, soil properties, and rainfall intensity) in biochar-amended soils has not been well understood. The aim of this study is to estimate the individual and coupled effects of five investigated factors (i.e., biochar content, soil compaction degree, slope gradient, slope length, and rainfall intensity) on infiltration, runoff, and soil erosion using in-house designed flume tests. Flume tests were planned based on factorial experiment design on bare soil (BS) and soil-biochar composites (SBCs). The results showed that biochar addition could reduce soil erosion by 10–69% and improve rainwater storage by 20–59%. Soil with 5% biochar amendment achieved the best amendment efficiency. This is likely due to the enhanced formation of water-stable macroaggregates in the presence of biochar. Biochar content was assessed as the most important factor in determining water retention and erosion reduction with 33% and 40% contribution, respectively. The total impact of slope conditions was vital on improving rainwater storage and erosion control by 29% and 43%, respectively. This study broadened the understanding of water erosion and hydrologic responses under the influence of biochar on SBCs and provided a sustainable perspective for the hydrologic management practice.

发现在垃圾掩埋场或屋顶绿化中应用生物炭改良技术具有控制侵蚀的潜力。为了解决土壤侵蚀问题，提出了利用入侵杂草（水葫芦）中过量生物质资源并将其转化为新型生物炭的策略。注意，在生物炭改良过的土壤中，受多种因素（例如，斜坡条件，土壤性质和降雨强度）影响的侵蚀过程尚未得到很好的理解。这项研究的目的是使用内部设计方法评估五个调查因素（即生物炭含量，土壤压实度，坡度梯度，坡长和降雨强度）对入渗，径流和土壤侵蚀的单独和耦合影响。水槽测试。根据析因试验设计，对裸露土壤（BS）和土壤生物炭复合材料（SBC）进行水槽测试。结果表明，添加生物炭可以减少10％至69％的土壤侵蚀，并提高20％至59％的雨水存储量。含5％生物炭的土壤改良效果最佳。这可能是由于在存在生物炭的情况下水稳性大聚集体形成的增加。生物炭含量被认为是决定保水率和减少侵蚀的最重要因素，分别贡献了33％和40％。斜坡条件的总体影响对于分别提高29％和43％的雨水储存和侵蚀控制至关重要。