When using mechanical harvesting, the sugarcane trash can be partially recovered for use as feedstock for bioenergy. However, the amount of trash that can be removed without prejudicing the sustainability of the sugarcane production system has still been little studied. The aim of this study was to evaluate the short-term impact of removing part of the sugarcane trash using enzymatic and microbiological soil quality indicators. We tested three rates of trash removal: 0% (T0), 50% (T50) and 100% (T100). The microbial biomass C (C_mic) and N (N_mic), β-glucosidase activity (GA) and the ratios C_mic as a per cent of C_tot and N_mic as a per cent of N_tot were highest for T100. The urease activity decreased with an increase in trash removal. The specific activity of β-glucosidase did not differ between the treatments, while the specific activity of urease showed the same pattern as the absolute activity. The metabolic quotients (qCO₂) were higher for T50 and T100 with no significant difference between them. The principal component analysis showed that the first component, which explained 77.66% of the total variance, was significantly correlated with N_mic, basal respiration and GA and discriminated the three treatments. The results showed that the removal of part of the trash adversely affected some of the soil quality attributes. This suggests the need for monitoring over a period of years in sugarcane areas where part of the trash is removed for industrial purposes, in order to better understand the cumulative impact on soil quality and to ensure the sustainability of bioenergy production.

中文翻译：

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土壤中残留不同数量的甘蔗垃圾：短期实验中对微生物和酶学指标的影响

使用机械收割时，可以部分回收甘蔗渣，用作生物能源的原料。然而，在不损害甘蔗生产系统可持续性的情况下可以去除的垃圾量仍然很少被研究。本研究的目的是评估使用酶促和微生物土壤质量指标去除部分甘蔗垃圾的短期影响。我们测试了三种除杂率：0% (T0)、50% (T50) 和 100% (T100)。微生物生物量 C (C _mic ) 和 N (N _mic )、β-葡萄糖苷酶活性 (GA) 以及 C _mic占 C _{tot 的}百分比和 N _mic占 N _{tot 的}百分比T100 最高。脲酶活性随着除杂率的增加而降低。β-葡萄糖苷酶的比活性在处理之间没有差异，而脲酶的比活性显示出与绝对活性相同的模式。T50 和 T100的代谢商数 ( q CO ₂ ) 较高，两者之间没有显着差异。主成分分析表明，解释总方差 77.66% 的第一个成分与 N _mic显着相关、基础呼吸和 GA 并区分三种处理。结果表明，去除部分垃圾会对某些土壤质量属性产生不利影响。这表明需要对部分垃圾被用于工业目的的甘蔗地区进行多年监测，以便更好地了解对土壤质量的累积影响并确保生物能源生产的可持续性。