水保所知识产出(1956---)知识库

研究深层土壤碳库动态对了解陆地生态系统深层碳汇潜力、应对全球CO2升高具有重要
意义。论文以黄土丘陵区人工油松林为研究对象，以撂荒地为参照，分析了不同生长阶段的人
工油松林地0~200 cm 土层土壤有机碳（soil organic carbon，SOC）和活性有机碳（readily oxidizable
carbon，ROC）动态变化特征及其影响因素。结果表明：在0~200 cm剖面上，不同生长阶段
油松林SOC含量及储量较撂荒地显著提高。浅层（0~100 cm）SOC平均含量，成熟林为撂荒地的
2.03 倍，提高最大；其次是中龄林，为1.85 倍；最后是幼龄林，为1.59 倍。深层（100~200 cm）SOC
平均含量，幼龄林、中龄林和成熟林分别较撂荒地提高了1.43、1.38 和1.36 倍。各生长阶段油松
林浅层和深层SOC储量分别占0~200 cm SOC储量的61.0%~69.8%和30.2%~39.0%，不同生长
阶段间浅层SOC储量差异显著，但深层SOC储量差异不大。浅层ROC储量，幼龄林、中龄林和
成熟林依次提高了54.8%、82.0%和91.6%；深层ROC储量依次提高了32.4%、40.9%和58.1%，且
深层储量占0~200 cm土层的31.2%~33.3%。不仅浅层SOC和ROC含量受多个因素的影响，而
且深层ROC含量也与油松高度、根系生物量以及枯落物厚度、干重呈极显著正相关。因此，人工
林建设不仅显著提高浅层SOC和ROC含量，而且对深层土壤的固碳能力有一定改善。

It is not clear how plantation affect the soil organic carbon (SOC) in deep soil for
terrestrial ecosystem. Based on space for time method, we studied the effect of Pinus
tabulaeformis plantations at three developmental stages (young forest, middle age forest and
mature forest) on the soil organic carbon (SOC) and soil readily oxidizable carbon (ROC) in 0-
200 cm soil profile. The results showed that SOC content and storage significantly increased in
soils with different developmental stages of Pinus tabulaeformis plantation compared with
abandoned cropland in 0-200 cm profile. In the 0-100 cm soil layer, average SOC content of
mature forest, middle age forest and young forest were 2.03, 1.85 and 1.59 times more than that
in abandoned cropland, respectively. SOC storage in shallow and deep soil layers contributed
61.0%-69.8% and 30.2%-39.0% to total SOC storage in the whole profile (0-200 cm) at all of
the investigated developmental stages. SOC storage in shallow soil layer varied significantly
among different developmental stages, however, no obvious difference of SOC storage in deep
soil layer was observed at all developmental stages. Compared to that in abandoned cropland,
the ROC storage in soils of young forest, middle age forest and mature forest increased 54.8%,
82.0% and 91.6% in shallow soil layer and 32.4% , 40.9% and 58.1% in deep soil layer,
respectively. ROC storage in deep soil layer contributed 31.2%-33.3% to total ROC storage in
the whole profile (0-200 cm) at all developmental stages. SOC and ROC content in shallow
soil layer were influenced by a number of factors, furthermore, ROC content in deep soil
showed significant correlations with the plant height, root biomass, litter thickness and litter
biomass. In conclusion, construction of artificial forest may significantly improve the soil
carbon pool in both shallow and deep soil profiles.