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通过黑河中游不同土地利用类型下土壤碳密度、碳储量的研究表明:总有机碳(TOC)、活性有机碳(AOC)、非活性有机碳(NOC)碳密度、碳储量从小到大呈不同的变化趋势。其中,NOC与TOC碳密度从大到小的空间分布基本一致,而AOC与NOC、TOC的分布存在差异,说明土地利用类型变化对三类有机碳的影响不同。经计算得到,1 m深度TOC、AOC、DOC碳库总量分别为94.72、45.12、49.60 Tg,DOC碳库占TOC碳库的比例略高于AOC占TOC碳库的比例。分析发现,引入AOC和NOC指标,更能真实反映出有机碳与影响因素间关系。
The results of soil carbon density and carbon storage under different land use types in the middle reaches of Heihe River show that the carbon density and carbon storage of total organic carbon (TOC), active organic carbon (AOC) and non-active organic carbon (NOC) vary from small to large Trend. Among them, the spatial distribution of NOC and TOC carbon density is basically the same, while the distribution of AOC, NOC and TOC are different, indicating that the impact of land use types on the three types of organic carbon is different. The total carbon stocks of TOC, AOC and DOC at 1 m depth are 94.72, 4.12 and 49.60 Tg respectively. The ratio of DOC carbon pool to TOC carbon pool is slightly higher than the proportion of AOC to TOC carbon pool. The analysis found that the introduction of AOC and NOC indicators can more accurately reflect the relationship between organic carbon and the impact of factors.