Soil-carbon sequestration and soil-carbon fractions, comparison between poplar plantations and corn crops in south-eastern Spain
Soil-carbon sequestration and soil-carbon fractions, comparison between poplar plantations and corn crops in south-eastern Spain
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DOI：
10.1016/j.still.2013.01.011
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发表时间：
2013-06
影响因子：
6.5
通讯作者：
M. Sierra;F. Martínez;R. Verde;F. Martín;F. Macías
中科院分区：
文献类型：
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作者：
M. Sierra;F. Martínez;R. Verde;F. Martín;F. Macías
土壤作为大气碳汇的潜力以及与减少温室气体排放相关的影响已得到广泛认可。在农业土壤上种植木本作物比玉米作物等其他农业用途更能增强土壤碳固存。因此，我们对 6 个具有不同杨树种植期限（5 年、10 年、20 年、30 年、50 年和 100 年）的地块进行了研究，并与 6 个邻近的玉米作物地块进行了比较。杨树人工林土壤碳库与所研究的三个土壤深度（0-20、20-50和50-100cm）的使用时间呈正相关，年平均增量为1.16Mg C ha−1year−1。杨树种植园土壤还以更有效的方式增加了总碳含量，因为使用时间也与最顽固的碳形式相关。因此，从玉米作物到杨树种植园土壤的土地利用变化不仅具有经济利润，而且对总有机碳库以及通过增加土壤中不可氧化形式的碳固存效率都是积极的。
The potential of soils as a sink of atmospheric carbon and the implications related to mitigate greenhouse-gas emissions are well recognized. The raising of tree crops on agricultural soils can augment soil-carbon sequestration more than do other agricultural uses such as corn crops. Thus, 6 plots with different durations of use as poplar plantation (5, 10, 20, 30, 50, and 100 years) were studied in comparison with 6 adjacent plots with corn crop. The carbon pool in poplar-plantation soils was positively correlated to the time of use at the three soil depths studied (0–20, 20–50, and 50–100cm), the mean annual increase being 1.16Mg C ha−1year−1. Poplar-plantation soils also increased the total carbon content in a more effective way because the duration of use was also correlated with the most recalcitrant carbon forms. Therefore, land-use change from corn crops to poplar-plantation soils is economically profitable as well as positive both for the total organic-carbon pool as well as for the efficiency of carbon sequestration by the increase of non-oxidizable forms in the soil.