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首页> 外文期刊>Soil Science Society of America Journal >Soil Aggregation and Soil Organic Carbon Stabilization: Effects of Management in Semiarid Mediterranean Agroecosystems
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Soil Aggregation and Soil Organic Carbon Stabilization: Effects of Management in Semiarid Mediterranean Agroecosystems

机译：土壤聚集和土壤有机碳稳定：地中海半干旱农业生态系统中管理的影响

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In semiarid agroecosystems of the Ebro valley (NE Spain) soils are characterized by low soil organic matter (SOM) and a weak structure. In this study we investigated the individual and combined effect of tillage system (no-tillage, NT; reduced tillage, RT; conventional tillage, CT) and cropping system (barley–fallow rotation at the Peñaflor site, PN-BF and continuous barley at the Peñaflor site, PN-BB) on soil organic carbon (SOC) storage as well as the physical protection of SOM fractions by soil aggregates in three long-term experimental sites. In both cropping systems, total SOC content was more than 30% higher in NT compared with CT in the 0- to 5-cm depth. The suppression of fallowing in the PN-BB cropping system led to a greater SOC stabilization only in NT. In all the three sites, greater proportion of water-stable macroaggregates (>250 µm) was found under NT than under CT in the 0- to 5-cm depth. Macroaggregate organic C concentration (250–2000 µm) was greater in NT compared with CT in the BB cropping system, but did not differ with tillage treatment in the PN-BF rotation. Greater proportion of microaggregates within macroaggregates in NT compared with CT was only found in the Agramunt site (AG). However, greater C stabilized inside these microaggregates was observed in AG, Selvanera site (SV), and PN-BB in the 0- to 5-cm depth. The results of this study demonstrate that in the semiarid Mediterranean agroecosystems of the Ebro valley, the adoption of NT together with the suppression of long-fallowing period can significantly increase the amount of SOC stabilized in the soil surface and improve soil structure and aggregation.
机译：在埃布罗河谷（西班牙东北部）的半干旱农业生态系统中，土壤 的特征是土壤有机质含量低和 结构弱。在这项研究中，我们研究了耕作制度（免耕，NT；减少耕作， RT；常规耕作，CT）和耕作制度（大麦–土壤有机碳（SOC）上Peñaflor地点PN-BF的休闲度 和PN-BB处Peñaflor地点的连续大麦 在三个长期的实验点中通过土壤团聚体对SOM馏分 的储存和物理保护。在 这两个种植系统中，与0〜5 cm深度的CT相比，NT的总SOC含量比CT高30％以上。在PN-BB种植系统中抑制休耕 仅在NT中导致更大的SOC 稳定性。在这三个位置中，在0cm至5cm的深度下，NT上发现的 比例较大的 （> 250 µm）大于CT。与BB种植系统中的CT相比，NT中的大骨料 有机碳浓度（250-2000 µm）要高 ，但耕作的差异不大。在PN-BF旋转中进行治疗。在NT中，大型聚集体中微聚集体的更大比例与CT相比仅在Agramunt站点（AG）中发现。但是，在AG， Selvanera位点（SV）和PN-BB的0至5 cm深度处观察到这些微聚集体内部稳定的更大的 C。这项研究的 结果表明，在埃布罗河谷的半干旱地中海 农业生态系统中，NT一起采用 抑制了长期食用期间可以显着 增加土壤表面稳定的SOC的量，并 改善土壤的结构和聚集。

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  • 来源
    《Soil Science Society of America Journal》 |2009年第5期|1519-1529|共11页
  • 作者

    J. álvaro-Fuentes; C. Cantero-Martínez; M. V. López; K. Paustian; K. Denef; C. E. Stewart; J. L. Arrúe;

  • 作者单位

    Present address: Natural Resource Ecology Lab., Colorado State Univ., Fort Collins, CO 80523,Dep. of Geological Sciences, Univ. of Colorado, Boulder, CO 80309;

    Departamento de Suelo y Agua, Estación Experimental de Aula Dei, Consejo Superior de Investigaciones Científicas (CSIC), POB 202, 50080-Zaragoza, Spain,Dep. of Geological Sciences, Univ. of Colorado, Boulder, CO 80309;

    Dep. of Soil and Crop Science, Colorado State Univ., Fort Collins, CO 80523,Dep. of Geological Sciences, Univ. of Colorado, Boulder, CO 80309;

    Lab. of Applied Physical Chemistry, Ghent Univ., Ghent, Belgium,Dep. of Geological Sciences, Univ. of Colorado, Boulder, CO 80309;

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