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土壤有机碳是陆地碳库的重要组成部分,其形成常和植被、气候等环境要素相关。为了解贺兰山地区土壤有机碳状况,2011年对贺兰山东麓青海云杉(Picea crassfolia)、油松(Pinus tabulaeformis)和灰榆(Ulmus glaucescens)林下土壤和根系取样,测定了各自的有机碳含量。结果表明:青海云杉、油松和灰榆林林下土壤平均有机碳含量分别为34.12g/kg、17.83g/kg和15.32g/kg,林下根系有机碳密度分别为869.12g/m2、532.17g/m2和242.68g/m2,林下土体(土壤和根系)有机碳密度分别为17.58kg/m2、9.55kg/m2和4.00kg/m2;林下根系有机碳占林下土体有机碳的比重为4.94%～6.0%。贺兰山青海云杉林下土壤碳储量高于全国森林土壤碳储量平均水平,油松林下碳储量略低于全国森林土壤碳储量平均水平,灰榆林碳储量仅为全国森林土壤碳储量平均水平的36.7%。青海云杉和油松林利于土壤有机碳累积,其林下土壤是贺兰山地区重要的有机碳库。
Soil organic carbon is an important part of terrestrial carbon pools, and its formation is often related to environmental factors such as vegetation and climate. In order to understand the status of soil organic carbon in the Helan Mountain region, soil and roots of Picea crassfolia, Pinus tabulaeformis and Ulmus glaucescens were sampled from the eastern foot of Helan Mountain in 2011, and their respective organic carbon content. The results showed that the average soil organic carbon contents in the spruce, Pinus tabulaeformis and Ash Yulin stands were 34.12g / kg, 17.83g / kg and 15.32g / kg, respectively. The organic carbon density in understory roots was 869.12g / m2 and 532.21 g / m2 and 242.68g / m2 respectively. The organic carbon density of soil under soil (soil and root system) was 17.58kg / m2, 9.55kg / m2 and 4.00kg / m2 respectively. The proportion of 4.94% ~ 6.0%. The soil carbon storage under the Picea crassifolia forest in Helan Mountain is higher than the average level of the national forest soil carbon storage. The understory carbon storage of Pinus tabulaeformis forest is slightly lower than the average level of the national forest soil carbon storage. The carbon storage of the ash forest is only 36.7% of the national forest soil carbon storage average %. Qinghai spruce and Pinus tabulaeformis accumulate soil organic carbon, and the understory soil is an important organic carbon pool in Helan Mountain.