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首页> 外文期刊>Soil & Tillage Research >Soil carbon dynamics and crop residue yields of cropping systems in the Northern Guinea Savanna of Burkina Faso.
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Soil carbon dynamics and crop residue yields of cropping systems in the Northern Guinea Savanna of Burkina Faso.

机译：布基纳法索北部几内亚热带稀树草原上耕作系统的土壤碳动态和作物残留量。

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摘要

Concerns about effects of increasing atmospheric concentration of carbon dioxide (CO2) on climate has given rise to the possibility of emission credits for soil organic carbon (SOC) sequestration. The goal of this study was to analyze SOC sequestration options in cropping systems of the Northern Guinea Savanna of West Africa. An 11-year experiment from the region, which consisted of 56 cropping system treatments that combined various crop rotation sequences with various input levels and an additional treatment of native grass fallow, was analysed. Rotations included one or more of: sorghum (Sorghum bicolor (L.) Moench), cotton (Gossypium hirsutum L.), groundnut (Arachis hypogaea L.), maize (Zea mays L.) and native grass fallow. Inputs were defined by whether or not the plots were plowed and the addition of soil amendments (N, nitrogen; P, phosphorous; K, potassium; D, dolomite; CR, crop residues; CP, compost and ME, manure). Plots were mouldboard plowed before seeding, except fallows, which were not plowed. Soil organic carbon in select treatments and residue yields from all cropped treatments were analysed. The slope parameters from the regression analysis of SOC in the continuous fallow treatment were not significantly different from zero (P>0.05), suggesting SOC (0.53% after 11 years) was at steady state in this treatment. Rotation and input significantly affected SOC (P<0.05), but interaction effects were not significant. After 11 years, the cropped rotation with the greatest SOC was sorghum-fallow (0.46%), which was significantly greater (P<0.05) than SOC in other the rotations measured: continuous cotton (0.36%), continuous sorghum (0.35%), and cotton-maize-sorghum (0.33%). For the input levels, addition of P, K, and ME gave the greatest SOC (0.44%) after 11 years of cropping, which was significantly greater (P<0.05) than SOC from the N, P, K and D (0.37%), no input (0.32%) and N, P and K (0.34%) treatments. In addition, SOC with inputs of N, P, K and D (0.37%) was significantly greater than SOC with no input (0.32%). Three management practices, which had significantly greater SOC than others and were among the best for yields, were identified as sequestering management options for the region. These were rotating sorghum and fallow, and amending the soil with mineral P, K, and ME or N, P, K and D. However, potential drawbacks, such as a risk of reduced production with increased fallows, must be identified and addressed if the options are to be adopted..
机译：对大气中二氧化碳（CO2）浓度升高对气候影响的担忧引起了土壤有机碳（SOC）封存产生排放信用的可能性。这项研究的目的是分析西非北部几内亚热带稀树草原的种植系统中的SOC螯合选择。分析了该地区一项为期11年的实验，该实验由56种耕作系统处理方法组成，这些处理方法将各种轮作序列与各种投入水平相结合，并对原生草休耕作了其他处理。轮作包括以下一种或多种：高粱（高粱），棉花（陆地棉），花生（花生），玉米（玉米）和本地草场。通过是否耕作土地和添加土壤改良剂（N，氮，P，磷，K，钾，D，白云石，CR，作物残渣，CP，堆肥和ME，肥料）来定义投入。除未耕种的休耕地外，在播种前将样板犁在犁板上。分析了特定处理的土壤有机碳和所有种植处理的残留量。连续休养期SOC回归分析的斜率参数与零无显着性差异（P> 0.05），表明该疗法中SOC（11年后为0.53％）处于稳定状态。旋转和输入对SOC有显着影响（P <0.05），但交互作用并不显着。 11年后，SOC最高的农作物轮作是高粱休耕（0.46％），在其他测得的轮作中，SOC显着高于（P <0.05）SOC：连续棉（0.36％），连续高粱（0.35％）和棉花玉米-高粱（0.33％）。就输入水平而言，在种植11年后，添加P，K和ME可获得最大的SOC（0.44％），这比N，P，K和D的SOC（0.37％）大得多（P <0.05）。 ），无输入（0.32％）和N，P和K（0.34％）处理。此外，输入N，P，K和D的SOC（0.37％）明显大于没有输入的SOC（0.32％）。三种管理措施的SOC比其他方法要高得多，并且在产量上是最好的，被确定为该地区的隔离管理选择。它们是旋转的高粱和休闲草，并用矿物质P，K和ME或N，P，K和D修饰土壤。但是，必须确定并解决潜在的弊端，例如因休闲增加而减产的风险。这些选项将被采用。

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