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Tunisian Soil Organic Carbon Stocks

机译：突尼斯土壤有机碳储量

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摘要

This study has two aims, the first, to analyze the spatial distribution of Soil Organic Carbon (SOC) in Tunisia, second, to estimate carbon stocks for major soil types representative of Mediterranean drylands. Repartition of SOC stocks at the depth of0.3 to 1 m were estimated for Tunisia, using a soil map combined with the results from a soil database. In addition, the total SOC stocks in the 0-30 cm and 0-100 cm soil depth were estimated for Tunisia using a digital soil map combined with results from a soil database. Tunisia contains nine main soil classes. The entire soil database totaled 1483 soil profiles corresponding to 5024 soil horizons. This dataset was built from previous analytical results published from Tunisian soil surveys (1960-2006). Most bulk density values were estimated using pedotransfer functions. Results showed that the upper soil layer 0-30 cm contains 405.44 TgC (1 Tg = 10~(12) g), while that in the 0-100 cm soil depth was estimated to be 1006.71 TgC. Estimates by soil types showed that the highest SOC stocks was estimated for Luvisols to 7.16 and 15.92 kgCm~(-2) for 0-30 cm and 0-100 cm, respectively. The lowest SOC stocks were estimated for the Lithosols to 1.84 kgCm~(-2) at 0-30 cm and 4.04 kgCm~(-2) for 0-100 cm. The soil types most representative in extension in Tunisia were the Lithosols, Regosols and the Cambisols and stocks were estimated to 73.22,119.83 and 100.35 TgC, respectively. Tunisian SOC density in the surface layer 0-30 cm is 2.612 kgCm~(-2) and 6.486 kgCm~(-2) within the 0-100 cm depth.
机译：这项研究有两个目标，第一，分析突尼斯的土壤有机碳（SOC）的空间分布，第二，评估代表地中海旱地的主要土壤类型的碳储量。使用土壤图和土壤数据库的结果，估计了突尼斯SOC储量在0.3到1 m的重新分配。此外，使用数字土壤图结合土壤数据库的结果，估算了突尼斯0-30 cm和0-100 cm土壤深度的总SOC储量。突尼斯有九种主要的土壤类别。整个土壤数据库共有1483个土壤剖面，对应于5024个土壤层。该数据集是根据突尼斯土壤调查（1960-2006）先前发布的分析结果建立的。大多数堆积密度值是使用pedotransfer函数估算的。结果表明，上层0-30 cm土层中含405.44 TgC（1 Tg = 10〜（12）g），而在0-100 cm中土层中的土壤深层估计为1006.71 TgC。通过土壤类型的估算表明，在0-30 cm和0-100 cm处，Luvisols的最高SOC储量分别估计为7.16和15.92 kgCm〜（-2）。估计在0-30 cm处，岩石溶胶的最低SOC储量为1.84 kgCm〜（-2），在0-100 cm处为4.04 kgCm〜（-2）。突尼斯最有代表性的土壤类型为石质，Regosol和Cambisol，储量估计分别为73.22,119.83和100.35 TgC。在0-100 cm深度内，表层0-30 cm的突尼斯SOC密度为2.612 kgCm〜（-2）和6.486 kgCm〜（-2）。

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