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Shifting abundances of communities associated to nitrogen cycling in soils promoted by sugarcane harvest systems
Letters in Applied Microbiology ( IF 2.0 ) Pub Date : 2020-07-29 , DOI: 10.1111/lam.13314 A Rigotto 1 , S R Cotta 1, 2 , A C F Dias 1 , J L N Carvalho 3 , F D Andreote 1
Letters in Applied Microbiology ( IF 2.0 ) Pub Date : 2020-07-29 , DOI: 10.1111/lam.13314 A Rigotto 1 , S R Cotta 1, 2 , A C F Dias 1 , J L N Carvalho 3 , F D Andreote 1
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Sugarcane cultivation supports Brazil as one of the largest world sugar and ethanol producer. In order to understand the impact of changing sugarcane harvest from manual to mechanized harvest, we studied the effect of machinery traffic on soil and consequently soil compaction upon soil microbial communities involved in nitrogen cycling. The impact of sugarcane harvest was dependent on soil depth and texture. At deeper soil layers, mechanized harvesting increases the abundance of nitrogen fixers and denitrifying communities (specifically nosZ clade I and II) while manual harvesting increases the abundance of ammonia oxidizers (specifically AOA) and increases denitrifying communities (nosZ clade I and II) on top and at intermediate depth. The effect of change on the harvest system is more evident on sandy soil than on clay soil, where soil indicators of compaction (bulk density and penetration resistance) were negatively correlated with soil microorganisms associated with the nitrogen cycle. Our results point to connections between soil compaction and N transformations in sugarcane fields, besides naming biological variables to be used as proxies for alterations in soil structure.
中文翻译：
甘蔗收获系统促进土壤氮循环相关群落丰度的变化
甘蔗种植使巴西成为世界上最大的糖和乙醇生产国之一。为了了解将甘蔗收获从手动收获改为机械收获的影响，我们研究了机械运输对土壤的影响，从而对土壤压实对参与氮循环的土壤微生物群落的影响进行了研究。甘蔗收获的影响取决于土壤深度和质地。在更深的土壤层，机械化收获增加了固氮剂和反硝化群落（特别是 nosZ 进化枝 I 和 II）的丰度，而手动收获增加了氨氧化剂（特别是 AOA）的丰度，并增加了顶部的反硝化群落（nosZ 进化枝 I 和 II）并处于中等深度。改变对收获制度的影响在沙土上比对粘土更明显，其中土壤压实指标（体积密度和渗透阻力）与与氮循环相关的土壤微生物呈负相关。我们的结果指出了甘蔗田中土壤压实和氮转化之间的联系，除了命名生物变量以用作土壤结构变化的代理。
更新日期：2020-07-29
中文翻译：
甘蔗收获系统促进土壤氮循环相关群落丰度的变化
甘蔗种植使巴西成为世界上最大的糖和乙醇生产国之一。为了了解将甘蔗收获从手动收获改为机械收获的影响，我们研究了机械运输对土壤的影响，从而对土壤压实对参与氮循环的土壤微生物群落的影响进行了研究。甘蔗收获的影响取决于土壤深度和质地。在更深的土壤层，机械化收获增加了固氮剂和反硝化群落（特别是 nosZ 进化枝 I 和 II）的丰度，而手动收获增加了氨氧化剂（特别是 AOA）的丰度，并增加了顶部的反硝化群落（nosZ 进化枝 I 和 II）并处于中等深度。改变对收获制度的影响在沙土上比对粘土更明显，其中土壤压实指标（体积密度和渗透阻力）与与氮循环相关的土壤微生物呈负相关。我们的结果指出了甘蔗田中土壤压实和氮转化之间的联系，除了命名生物变量以用作土壤结构变化的代理。
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