Edgar Barrales-Brito, Fernando Paz-Pellat, J. Etchevers-Barra, C. Hidalgo-Moreno, A. Velázquez-Rodríguez
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引用次数: 1
摘要
土地利用的变化会改变土壤结构,增加有机质的矿化率,从而影响生态系统中的碳动态。在本研究中,我们评估了土壤利用方式、团聚体深度和大小对塔拉洛克山不同土地利用方式(林业、acahual、草地和农业)土壤碳矿化排放的碳(C)和土壤呼吸(CO2)含量的影响。森林生态系统的土壤C含量(超过100 g C kg-1)高于农业、acahual和草地生态系统的土壤C含量(分别为20、30和50 g C kg-1)。在有林地利用的样地,平均加权直径值大于1.5 mm,大团聚体的比例更高(>2 mm;>25%),表明前30 cm深度土壤结构较好,微团聚体占主导地位(< 0.5 mm),比例高于50%,土壤中C含量较低(土壤中小于10 g C kg-1),呼吸释放的CO2量较高(土壤中大于40 g CO2 kg-1)。土壤结构稳定性影响碳动态,土壤结构越好,碳含量越高,土壤CO2排放量越少。
Dinámica de carbono en agregados del suelo con diferentes tipos de usos de suelo en el monte Tláloc, Estado de México
Changes in land use influence the carbon dynamics in ecosystems given these modify the soil structure and increase the mineralization rates of organic matter. In this study, we evaluated the effect of soil use, depth and size of aggregates on carbon (C) and soil respiration (CO2) content emitted by the mineralization of C in soils with different land uses (forestry, acahual, grassland and agricultural) in Mount Tlaloc. Soil C was higher in forest ecosystems (over 100 g C kg-1 of soil) than in soils with agricultural, acahual and grassland use with 20, 30 and 50 g C kg-1 of soil, respectively. In sites with forest land use, mean weighted diameter values were larger than 1.5 mm and a greater percentage of macroaggregates (>2 mm; >25%) was found, which indicated a better soil structure in the first 30 cm depth with respect to the site with agricultural use, where microaggregates were predominant (< 0.5 mm) with percentages higher than 50%, and a lower amount of C (less than 10 g C kg-1 of soil) was detected, as well as a higher amount of CO2 emitted by respiration (greater than 40 g CO2 kg-1 of soil). The soil structure stability influenced the dynamics of C, given that a better soil structure presented a higher content of C and a decrease of CO2 emissions of the soil.