黑河中游不同土地利用类型下土壤碳储量及其空间变化

The Spatial Distribution of Soil Organic Carbon Storage and Change under Different Land Uses in the Middle of Heihe River

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。

Spatial distribution of soil organic carbon density,storage and its change are researched under different land uses in the middle of Heihe River,based on the multi-methods of gathering field samples,laboratory analysis,GIS spatial analysis model and remote sensing.The results show that obvious spatial otherness of total soil carbon（TOC）,active organic carbon（AOC）,nonactive organic carbon（NOC） exist under different land uses.NOC density is consistent with TOC,but density of AOC is different.It indicates that impacts of land use changes on TOC,AOC and NOC are different.According to the calculation result,storage of TOC,AOC and NOC is 94.72 Tg,45.12 Tg and 49.60 Tg in 1m depths,respectively.AOC account is for 47.63% and NOC is 52.36%.It＇s found that the relationship between SOC and influencing factors is more authentic if AOC and NOC are introduced.