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首页> 外文期刊>Plant and Soil >Litter quality and decomposition in a CO2-enriched Mediterranean forestecosystem
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Litter quality and decomposition in a CO2-enriched Mediterranean forestecosystem

机译：富含二氧化碳的地中海森林生态系统中的凋落物质量和分解

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Six large open top chambers were installed to test the effect of atmospheric [CO2] enrichment on clumps of natural Mediterranean vegetation starting from early spring 1992. To study the impact of [CO2] enrichment on litter decomposition, leaves of three woody species (Quercus ilex L., Phillyrea angustifolia L. and Pistacia lentiscus L.) were collected from the forest floor and subsequently incubated in situ over a two-year period. The initial slope of the exponential function, describing mass loss, indicated that there was a small negative effect of elevated [CO2] on the decomposition rate of all the species. All regressions were significant. The decrease of decomposition rate is particularly notable during the initial stages of decomposition, when the differences of quality parameters, lignin/N and C/N were larger. This study points out that a decrease of decomposition rate may occur under elevated [CO2] conditions; if this effect is coupled to an increase of primary production, there will be a net rise of C-storage in the soils of forest ecosystems. Forest soils may, therefore, represent a potentially increasing sink for this excess carbon.
机译：从1992年初春开始，安装了六个大型敞开式试验箱，以测试大气[CO2]富集对地中海自然植被丛生的影响。为研究[CO2]富集对凋落物分解，三种木本植物叶子（栎树）的影响从森林地上收集L.，Phillyrea angustifolia L.和Pistacia lentiscus L.），然后在两年内原位孵育。表示质量损失的指数函数的初始斜率表明，[CO2]升高对所有物种的分解速率都有很小的负面影响。所有回归均显着。分解初期，木质素/ N和C / N的差异较大时，分解速率的下降尤为明显。这项研究指出，在[CO2]升高的条件下，分解速率可能会降低。如果这种影响与初级生产的增加相结合，森林生态系统土壤中的碳储存将净增加。因此，森林土壤可能代表着这种过量碳的潜在增加。

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