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土壤有机碳密度(SOCD)和储量的准确估算对于评估土壤有机碳在气候变化中的作用至关重要。本文以4种不同土地利用方式(草地、裸地、农田和林地)为例,探讨不同取样方法(按固定深度取样和按土壤自然发生层次取样)和不同计算方法(基于等体积和基于等质量计算)对黑土剖面SOCD结果的影响。结果表明,4种土地利用方式下,按固定深度和按发生层次取样所得SOCD均存在显著差异,但不同土地利用方式下二者大小关系不同。基于等体积计算SOCD时,林地和草地表层(0~30 cm)SOCD显著低于基于等质量计算方法所得SOCD,而对于更深层次土体(100和200 cm),计算方法对SOCD的影响不显著。因此,在实践中估算土壤有机碳储量时,应针对具体的土地利用方式,根据研究目的选取适宜的取样和计算方法。另外,当计算较深层次土体SOCD时,可不考虑计算方法对SOCD结果的影响。
Accurate estimation of soil organic carbon density (SOCD) and reserves is crucial for assessing the role of soil organic carbon in climate change. Taking four different land use types (grassland, bare land, farmland and woodland) as examples, the paper discusses different sampling methods (sampling at fixed depth and sampling at soil natural level) and different calculation methods (based on equal volume and based on equal mass Calculation) on the SOCD results of black soil profiles. The results showed that there were significant differences in SOCD at fixed depth and sampling by occurrence levels under the four land use types, but the relationship between them was different under different land use patterns. When SOCD was calculated based on equal volume, the SOCD of 0-30 cm in forestland and grassland was significantly lower than that of SOCD based on equal mass calculation, while the calculation method had no significant effect on SOCD in deeper soil (100 and 200 cm) . Therefore, when estimating soil organic carbon reserves in practice, we should select suitable sampling and calculation methods according to the purpose of the study according to the specific land use patterns. In addition, when calculating SOCD of deep soil, the influence of calculation method on SOCD result may not be considered.