Long-term impact of conservation tillage on stratification ratio of soil organic carbon and loss of total and active CaCO3
Long-term impact of conservation tillage on stratification ratio of soil organic carbon and loss of total and active CaCO3
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DOI：
10.1016/j.still.2004.12.001
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发表时间：
2006-01-01
影响因子：
6.5
通讯作者：
Girón, IF
中科院分区：
文献类型：
--
作者：
Moreno, F;Murillo, JM;Girón, IF
在半干旱条件下，许多土壤的性质受到有机质和碳酸钙（CaCO 3）的影响。然而，在地中海半干旱条件下，几乎没有研究过不同耕作制度对这些特性发展的影响。研究了长期保护性耕作（CT）和传统耕作（TT）对土壤有机碳层结比和CaCO 3含量的影响。该研究在小麦（Triticum aestivum L.）向日葵（Helianthus annuus L.）1991年在西班牙西南部受污染的条件下建立了作物轮作。按照这个地区的传统，小麦施肥，但向日葵没有。保护性耕作的特点是减少了耕作作业的次数，并将作物残留物留在土壤表面，而TT则采用了犁板耕作。土壤有机碳的分层率由0-5和5-10 cm土层的碳含量除以2540 cm土层的碳含量计算。CT（>2）处理的土壤有机碳分层率显著大于TT（2）处理，说明土壤质量较好。我们的研究结果表明，在这两种耕作制度下的CaCO 3的损失。然而，在TT下CaCO 3的损失显著高于在CT下。此外，P和K积累在土壤表面和分层比这两种养分是在CT大于TT。(C)2005 Elsevier B. V.保留所有权利。
Under semi-arid conditions, the properties of many soils are influenced by the presence of organic matter and calcium carbonate (CaCO3). However, the influence of different tillage systems on the development of these properties has scarcely been studied under semi-arid Mediterranean conditions. We studied the effect of long-term conservation tillage (CT) and traditional tillage (TT) on the stratification ratio of soil organic carbon and on CaCO3 content. The study was conducted in a wheat (Triticum aestivum L.)-sunflower (Helianthus annuus L.) crop rotation established in 1991 under tainted conditions in Southwestern Spain. As is traditional in this area, wheat was fertilised, but sunflower was not. Conservation tillage was characterised by reduced number of tillage operations and leaving crop residues on the soil surface, while TT was with mouldboard ploughing. Stratification ratio of soil organic C was calculated from C contents in the 0-5 and 5-10 cm soil layers divided by that in the 2540 cm. Stratification ratio of soil organic C under the CT (>2) was significantly greater than under TT (2 indicating better soil quality. Our results show a loss of CaCO3 under both tillage systems. However, the loss of CaCO3 was significantly higher under TT than under CT. Also, P and K accumulated in the soil surface and stratification ratio for both nutrients was greater in CT than in TT. (C) 2005 Elsevier B.V. All rights reserved.