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Soil health response to sugarcane straw removal in Brazil
Industrial Crops and Products ( IF 5.9 ) Pub Date : 2021-02-12 , DOI: 10.1016/j.indcrop.2021.113315
Maurício R. Cherubin , Ricardo O. Bordonal , Guilherme A. Castioni , Euriana M. Guimarães , Izaias P. Lisboa , Lucas A.A. Moraes , Lauren M.S. Menandro , Sarah Tenelli , Carlos E.P. Cerri , Douglas L. Karlen , João L.N. Carvalho

Sugarcane straw removal is a promising strategy to increase bioenergy production in Brazil. However, if straw removal is not properly managed, it may lead to soil health degradation, thus threatening sustainability of the entire bioenergy production system. In this context, a comprehensive assessment was conducted in 12 field experiments located in central-southern Brazil, the world’s largest sugarcane-producing region, to investigate the impacts of straw removal scenarios on soil health, using the Soil Management Assessment Framework (SMAF). Two groups of experiments were arranged in this study, consisting of three (no–NR; moderate–MR; and total removal–TR) and four straw removal treatments (NR; low–LR; high–HR; and TR). Soil samples were collected (0–10 and 10−20 cm) to evaluate a selected set of soil health indicators (i.e., pH, available phosphorus, exchangeable potassium, bulk density and soil organic carbon). Indicators were individually scored and then integrated into an overall Soil Health Index (SHI) and its chemical, physical, and biological components. Datasets were analyzed by site, experiment groups and soil texture (clayey and sandy soils) and the relationships among straw removal, soil health, and sugarcane yield were also investigated. Our findings showed that soil health responses to straw removal were properly detected by SMAF scoring curves. Based on SHI, sandy and clayey soils were functioning at 41–56% and 67–86% of their full potential, respectively. Soil health degradation was mostly induced by TR and HR, while LR and MR resulted in minimal detrimental effects on a short-term basis compared with NR. However, sandy soils were more prone to soil health degradation, indicating that straw removal should be avoided on those soils. For clayey soils, decline in soil health was driven by physical degradation. Healthier soils were associated with higher sugarcane stalk yields, and physical degradation was the main driver for crop yield losses. Conclusions drawn from this study suggest that comprehensive soil health assessments by integrating chemical, physical and biological indicators are fundamental to design more sustainable straw management and bioenergy production systems in Brazil.



中文翻译:

巴西对甘蔗秸秆去除的土壤健康响应

去除甘蔗秸秆是增加巴西生物能源产量的有前途的战略。但是,如果对秸秆清除的管理不当,可能会导致土壤健康恶化,从而威胁到整个生物能源生产系统的可持续性。在这种情况下,使用土壤管理评估框架(SMAF)对位于世界中最大的甘蔗产地巴西中南部的12个田间试验进行了全面评估,以调查秸秆清除情景对土壤健康的影响。本研究安排了两组实验,包括三项(无NR;中度MR;总清除TR)和四种秸秆清除处理(NR;低LR;高HR; TR)。收集土壤样本(0-10和10-20 cm)以评估一组选定的土壤健康指标(IE,pH,有效磷,可交换钾,容重和土壤有机碳)。对指标进行单独评分,然后将其整合到总体土壤健康指数(SHI)及其化学,物理和生物成分中。通过地点,实验组和土壤质地(粘土和沙质土壤)分析数据集,还研究了秸秆去除,土壤健康状况和甘蔗产量之间的关系。我们的发现表明,通过SMAF评分曲线可以正确检测出土壤对秸秆去除的健康响应。基于SHI,沙质和黏土的土壤功能分别发挥其全部潜力的41–56%和67–86%。与NR相比,土壤健康退化主要是由TR和HR引起的,而LR和MR在短期内对有害影响最小。然而,沙质土壤更容易造成土壤健康退化,这表明应避免在这些土壤上去除秸秆。对于黏性土壤,土壤健康的下降是由物理退化导致的。更健康的土壤与更高的甘蔗秸秆产量相关,而物理退化是造成农作物减产的主要驱动力。这项研究得出的结论表明,通过综合化学,物理和生物指标进行全面的土壤健康评估,对于设计巴西更具可持续性的秸秆管理和生物能源生产系统至关重要。物理退化是造成农作物减产的主要驱动力。这项研究得出的结论表明,通过综合化学,物理和生物指标进行全面的土壤健康评估,对于设计巴西更具可持续性的秸秆管理和生物能源生产系统至关重要。物理退化是造成农作物减产的主要驱动力。这项研究得出的结论表明,通过综合化学,物理和生物指标进行全面的土壤健康评估,对于设计巴西更具可持续性的秸秆管理和生物能源生产系统至关重要。

更新日期:2021-02-12
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