首页> 外文期刊>Biology and fertility of soils: Cooperating Journal of the International Society of Soil Science >Accumulation of soil organic carbon in aggregates after afforestation on abandoned farmland.
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Accumulation of soil organic carbon in aggregates after afforestation on abandoned farmland.

机译:退耕地造林后土壤中有机碳在聚集体中的积累。

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摘要

To understand how organic C (OC) accumulates in afforested soils and to quantify the contribution of aggregate-associated OC to OC accumulation, we investigated the changes in soil structure, total soil OC, and aggregate-associated OC from 0- to 10- and 10- to 20-cm depths in afforested forests and adjacent farmlands of northwestern China. We assessed the contribution of macroaggregate-associated OC increase to total soil OC accumulation. Afforestation increased macroaggregate amount, mean weight diameter, and mean geometric diameter but decreased the amount of microaggregate and silt+clay-sized fractions. The improvement of soil structure was greater in surface than subsurface soils and was greater in soils afforested with white birch than in soils afforested with other tree species. Fifty years after afforestation, total soil OC concentrations and stocks and aggregate-associated OC concentrations increased depending on soil depth and tree species. Afforestation increased macroaggregate-associated OC stocks but decreased microaggregate- and silt+clay-associated OC stocks. Soil OC stocks and changes in OC stocks after afforestation mainly depended on macroaggregate-associated OC stocks and their changes. The results from this study suggest that OC accumulation in afforested soils is due to the accumulation of OC in macroaggregates and the redistribution of OC from fine particles to coarser fractions.
机译:为了了解有机碳(OC)如何在造林土壤中积累并量化与团聚体相关的OC对OC积累的贡献,我们调查了土壤结构,总土壤OC和与团聚体相关的OC从0到10-以及中国西北地区的绿化森林和邻近农田的深度为10至20厘米。我们评估了大骨料相关OC增加对土壤总OC积累的贡献。造林增加了大团聚体的数量,平均重量直径和平均几何直径,但减少了微团聚体和淤泥+粘土大小部分的数量。表层土壤的改善大于表层土壤,白桦造林的土壤比其他树种的土壤改善更大。造林五十年后,土壤总的OC浓度和储量以及与集料有关的OC浓度随土壤深度和树木种类的增加而增加。造林增加了与大骨料相关的OC种群,但减少了与小骨料和粉尘+粘土相关的OC种群。造林后的土壤OC量和OC量的变化主要取决于与宏观总量相关的OC量及其变化。这项研究的结果表明,绿化土壤中的OC积累是由于OC在大团聚体中的积累以及OC从细颗粒到粗颗粒的重新分布所致。

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