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首页> 外文期刊>Plant and Soil >Radiocarbon based assessment of soil organic matter contribution to soil respiration in a pine stand of the Campine region, Belgium
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Radiocarbon based assessment of soil organic matter contribution to soil respiration in a pine stand of the Campine region, Belgium

机译：基于放射性碳的比利时坎皮恩地区松树林土壤有机质对土壤呼吸的贡献评估

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The contribution of decomposing soil organic carbon (SOC) to total annual soil respiration (SR) was evaluated by radiocarbon measurements at a Scots pine stand growing on a plaggen soil in the Belgian Campine region. Two approaches were used to estimate the contribution of different C pools to SR. In the first approach, the variations in 14C content of soil CO2 efflux were monitored during one year (2003) and compared to the atmospheric and SOC 14C signatures to determine the contribution of “fast” (root respiration and fast decomposing SOC) and “slow” cycling C pools to total SR. In the second approach an estimate of the total heterotrophic soil respiration (Rh), comprising the slow cycling C and the heterotrophic part of the fast-cycling C pools, was derived applying a box model based on the amount of the bulk SOC pool and its 14C-derived mean residence time (MRT). The quantification of the Rh and the decomposition rate of the slow-cycling SOC allows to indirectly determining the contribution of the heterotrophic C that decompose within a year. Measurements of total SR performed in the field allowed assessing the contribution of the different C pools to total soil C efflux. On an annual basis, the fast-cycling C was the main contributor to SR, about 85%, while the contribution of the slow-cycling C (with MRT 1 yr) to total SR was 15%. Total annual Rh was 36% of total SR, which is in the lower range reported for temperate coniferous forests. The comparison of Rh with other estimates for the same site (47–50% of total SR) suggest a possible underestimation of the C flux from the mineral soil. In fact, the “very old” C contained in the plaggen horizon strongly affects the signature of the mostly young C leaving the soil. In conclusion, our results indicate that the contribution of SOC decomposition to total soil CO2 flux in this forest is less than 40%, and at least half of it comes from organic compounds less than 1 year old.
机译：在比利时坎皮恩地区，在生长在贫瘠土壤上的苏格兰松林中，通过放射性碳测量，评估了土壤有机碳分解量（SOC）对土壤年总呼吸（SR）的贡献。使用两种方法来估计不同的C库对SR的贡献。在第一种方法中，监测一年（2003年）内土壤CO2排放量14 C含量的变化，并将其与大气和SOC 14 C特征值进行比较，以确定土壤中CO 2排放量的贡献。 “快速”（根呼吸和SOC快速分解）和“慢速”循环C池至总SR。在第二种方法中，基于大容量SOC库及其数量，使用箱形模型估算了总异养土壤呼吸（Rh），包括慢循环C和快速循环C库的异养部分。 14 C得出的平均停留时间（MRT）。 Rh的定量和慢循环SOC的分解速率可以间接确定一年内分解的异养C的贡献。在田间进行的总SR的测量可以评估不同碳库对土壤总碳流出的贡献。每年，快速循环碳是SR的主要贡献者，约占85％，而慢速循环碳（MRT> 1年）对总SR的贡献为15％。每年的Rh占SR的36％，在温带针叶林中处于较低的范围。将Rh与同一地点的其他估算值（总SR的47％至50％）进行比较，表明可能会低估矿物土壤中的C通量。实际上，包含在成胶层中的“非常老的” C强烈影响离开土壤的大部分C的签名。总之，我们的结果表明，该森林中SOC分解对土壤总CO2 通量的贡献不到40％，并且至少一半来自不到1年的有机化合物。

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