兰州—白银地区1987年与2014年表层土壤有机碳储量和碳密度变化趋势及影响因素探讨

CHANGES OF SOIL ORGANIC CARBON STORAGE AND DENSITY IN LANZHOU-BAIYIN REGION FROM 1987 TO 2014 AND THEIR INFLUENCING FACTORS

土壤碳库研究及碳汇问题是近年来土壤碳循环与全球变化研究的热点领域,土壤是陆地生态系统的核心,研究土壤有机碳储量和碳密度的影响因素对正确评价本区碳循环有重要意义,本文利用土壤类型、土地利用类型、地貌类型、生态系统等影响因素对研究区表层土壤有机碳密度和碳储量进行了评价,分析了兰州—白银地区1987年和2014年土壤有机碳储量、碳密度的变化,其中2014年土壤有机碳储量增加了3.58×10^(6)t,说明这些年土壤固碳效果明显,土地利用方式更合理。认为研究区有机碳碳密度、碳储量在空间上的分布极不均匀,与成土母质、土壤自身理化特性、土地利用方式及自然景观条件、人类活动等因素密切相关,是多因素综合影响的结果。

The study of soil carbon pool and carbon sink is a hot field in the research of soil carbon cycle and global change in recent years,and soil is the core of terrestrial ecosystem,it is important to study the influencing factors of soil organic carbon storage and carbon density for the correct evaluation of carbon cycle in this region,in this paper,soil type,land use type,landform type,ecosystem and other factors were used to evaluate the topsoil organic carbon density and carbon storage in the study area,the changes of soil organic carbon storage and density in lanzhou-baiyin region in 1987 and 2014 were analyzed.The soil organic carbon storage increased by 3.58×10^(6)t in 2014,which indicated that the effect of soil carbon sequestration was obvious in these years,the Way of land use is more reasonable.It is concluded that the distribution of organic carbon density and carbon storage in the study area is extremely uneven,it is closely related to soil parent material,soil physical and chemical properties,land use,land use pattern,natural landscape conditions and human activities.