为了解黄土高原生态林的固碳作用,以刺槐人工林幼林（8年生）和对照荒地为研究对象，比较了两种土地利用方式下，土壤、凋落物和植物各部分的有机碳密度(OCD)和生态系统碳吸存的变化.结果表明:刺槐人工林林地土壤OCD比荒地减少0.26 kg·m-2,其中0～10 cm层土壤OCD显著提高,10～30 cm土层降低,而在30～80 cm层土壤中则变化不明显.与荒地相比,刺槐人工林林地凋落物、植物根系和植物地上部分的OCD分别增加了121.1%、202.0%和656.7%,每年总有机碳吸存率增加3.3%,说明黄土高原营造刺槐人工林具有明显的碳吸存效应.
In order to understand the carbon sequestration of ecological forests in Loess Plateau, a comparative study was made on the organic carbon density (OCD) of soil, litter, and plant organs in an 8-year-old Robinia pseudoacacia plantation and nearby barren land. Comparing with the barren land, the young R. pseudoacacia plantation had a decrease (0.26 kg·m-2) of soil OCD, but the OCD in its litter, root system, and aboveground organs increased by 121.1%, 202.0%, and 656.7%, respectively, with a total carbon sequestration increased by 3.3% annually, which illustrated that R. pseudoacacia afforestation on Loess Plateau had an obvious positive effect on carbon sequestration.