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首页> 外文期刊>The Science of the Total Environment >Impacts of biochar application rates and particle sizes on runoff and soil loss in small cultivated loess plots under simulated rainfall
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Impacts of biochar application rates and particle sizes on runoff and soil loss in small cultivated loess plots under simulated rainfall

机译：模拟降雨条件下生物炭施用量和粒径对黄土小耕区径流和土壤流失的影响

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Increasing literature suggests that biochar can be used to improve soil fertility and subsequently benefit crop yield. However, the effects of biochar application rates and particle sizes on soil erosion processes have yet to be fully identified. The objective of the present study was to evaluate the influence of biochar with different application rates and particle sizes on soil erosion. Addition of biochar to loess generally increased the mean time to runoff by 19.47% relative to the control. The time to runoff decreased with an increase in the biochar application rates and fluctuated with a decrease in biochar particle sizes. The combined 1% and 0.25 mm biochar treatment yielded the longest time to runoff (2.97 min) and the lowest runoff (36.23 kg m(-2) h(-1) ) and soil loss (1.33 kg m(-2) min(-1)). Biochar addition decreased the total runoff volume by 12.21% and generally inhibited soil loss under lower application rates (1% and 3%) while promoting soil loss under higher application rates (5% and 7%). With a decrease in biochar particle size, total runoff volume increased under the 5% and 7% biochar, but no uniform trend was observed under the 1% and 3% biochar treatments. The total soil loss increased with increasing biochar application rates, whereas a negative trend was observed with decreasing biochar particle sizes. The contribution of biochar application rates to runoff and soil loss rates was distinctly greater than the biochar particle sizes. Additionally, biochar addition could increase 2 mm water-stable soil aggregates and saturated hydraulic conductivity (K-sat) in this study. We inferred that the positive effects on soil and water loss were potentially due to the improvement in 2 mm water-stable soil aggregates and K-sat. The results implied that soil-biochar additions could be a potential measure for conserving soil and water in the Loess Plateau. (C) 2018 Elsevier B.V. All rights reserved.
机译：越来越多的文献表明，生物炭可用于提高土壤肥力，从而有利于作物增产。但是，生物炭施用量和粒径对土壤侵蚀过程的影响尚未完全确定。本研究的目的是评价不同施用量和粒径的生物炭对土壤侵蚀的影响。与对照相比，在黄土中添加生物碳通常使平均径流时间增加了19.47％。径流时间随着生物炭施用量的增加而减少，并随着生物炭粒径的减小而波动。结合的1％和<0.25毫米生物炭处理产生了最长的径流时间（2.97分钟）和最低的径流（36.23 kg m（-2）h（-1））和土壤流失（1.33 kg m（-2）min （-1））。生物炭的添加使总径流量减少了12.21％，通常在较低施用量（1％和3％）下抑制了土壤流失，而在较高施用量（5％和7％）下促进了土壤流失。随着生物炭颗粒尺寸的减小，在5％和7％生物炭条件下总径流量增加，但在1％和3％生物炭处理条件下未观察到均匀的趋势。随着生物炭施用量的增加，总的土壤流失增加，而随着生物炭粒径的减小，总的土壤流失呈负趋势。生物炭施用率对径流和土壤流失率的贡献明显大于生物炭粒径。此外，在本研究中，添加生物炭可增加> 2 mm的水稳性土壤团聚体和饱和水力传导率（K-sat）。我们推断对水土流失的积极影响可能是由于> 2 mm的水稳性土壤团聚体和K-sat的改善。结果表明，添加土壤生物炭可以作为黄土高原水土保持的一项潜在措施。 （C）2018 Elsevier B.V.保留所有权利。

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