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首页> 外文期刊>Soil & Tillage Research >Short-term soil CO_2 emission after conventional and reduced tillage of a no-till sugar cane area in southern Brazil
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Short-term soil CO_2 emission after conventional and reduced tillage of a no-till sugar cane area in southern Brazil

机译：在巴西南部的免耕甘蔗区进行常规耕作和减少耕作后的短期土壤CO_2排放

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摘要

The impact of tillage systems on soil CO_2 emission is a complex issue as different soil types are managed in various ways, from no-till to intensive land preparation. In southern Brazil, the adoption of a new management option has arisen most recently, with no-tillage as well as no burning of crops residues left on soil surface after harvesting, especially in sugar cane areas. Although such practice has helped to restore soil carbon, the tillage impact on soil carbon loss in such areas has not beenwidely investigated. This study evaluated the effect of moldboard plowing followed by offset disk harrow and chisel plowing on clay oxisol CO_2 emission in a sugar cane field treated with no-tillage and high crop residues input in the last 6 years. Emissions after tillage were compared to undisturbed soil CO_2 emissions during a 4-week period by using an LI-6400 system coupled to a portable soil chamber. Conventional tillage caused the highest emission during almost the whole period studied, except forthe efflux immediately following tillage, when the reduced plot produced the highest peak. The lowest emissions were recorded 7 days after tillage, at the end of a dry period, when soil moisture reached its lowest rate. A linear regression between soil CO_2 effluxes and soil moisture in the no-till and conventional plots corroborate the fact that moisture, and not soil temperature, was a controlling factor. Total soil CO_2 loss was huge and indicates that the adoption of reduced tillage would considerably decrease soil carbon dioxide emission in our region, particularly during the summer season and when growers leave large amounts of crop residues on the soil surface. Although it is known that crop residues are important for restoring soil carbon, ourresult indicates that an amount equivalent to approximately 30% of annual crop carbon residues could be transferred to the atmosphere, in a period of 4 weeks only, when conventional tillage is applied on no-tilled soils.
机译：耕作制度对土壤CO_2排放的影响是一个复杂的问题，因为从免耕到集约整地，各种土壤类型都有不同的管理方式。在巴西南部，最近出现了一种新的管理方式，即收割后尤其是在甘蔗地区，免耕和不焚烧残留在土壤表面的农作物残渣。尽管这种做法有助于恢复土壤碳，但耕作对这些地区土壤碳损失的影响尚未得到广泛研究。这项研究评估了最近6年间在免耕和高农残输入条件下处理的甘蔗田中，mold草翻耕，偏置圆盘耙和凿子耕作对粘土中氧化木酚CO_2排放的影响。通过使用与便携式土壤箱连接的LI-6400系统，比较了4周内耕种后的排放与未扰动的土壤CO_2排放。在几乎整个研究期间，常规耕作导致最高的排放量，除了耕作后立即流出的情况，当减少的耕地产生最高峰时。耕作结束后的第7天记录的最低排放量是在干燥期结束时土壤湿度达到最低水平。免耕田和常规田间土壤CO_2排放与土壤水分之间的线性回归证实了以下事实：水分而不是土壤温度是控制因素。土壤CO_2的总损失巨大，这表明减少耕作将大大减少我们地区的土壤二氧化碳排放，特别是在夏季和种植者将大量农作物残留物留在土壤表面时。尽管众所周知，农作物残留物对于恢复土壤碳非常重要，但我们的结果表明，当在土壤上进行常规耕作时，仅在4周的时间内，大约有每年农作物碳残留量的大约30％就会转移到大气中。没有倾斜的土壤。

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