论文部分内容阅读
以黄土高原26年生人工刺槐(Robinia pseudoacacia)林为对象,在调查了5个样地和测定125个碳含量数据的基础上,分析了造林后土壤有机碳密度的变化特征与造林对土壤碳增汇的效应。结果表明:在研究的0~80cm土层范围内,26年生刺槐林林地土壤有机碳密度(4.093 kg.m-2)与荒地(4.533 kg.m-2)相比,减少了0.440 kg.m-2,说明黄土高原荒地刺槐造林不能提高土壤有机碳密度。对土壤分层研究表明:荒山刺槐造林明显改变了原土壤有机碳密度分布,表现为:在0~10 cm土层范围,有机碳密度显著提高(33.4%);在10~30 cm土层范围内,有机碳密度则明显降低(45.5%)。通过土壤层中总有机碳密度的研究显示,由于根系有机碳不断积累,林地总有机碳密度(5.214 kg.m-2)比荒地(4.688 kg.m-2)明显增加,土壤中总碳增汇率为11.2%,说明黄土高原刺槐造林具有显著的碳汇能力。
Taking Robinia pseudoacacia forest of 26 years old in the Loess Plateau as an example, the characteristics of soil organic carbon density after afforestation and the effects of afforestation on soil carbon Exchange effect. The results showed that the soil organic carbon density in 26-year-old Robinia pseudoacacia forest (4.093 kg · m-2) was reduced by 0.440 kg · m compared with the wasteland (4.533 kg · m-2) -2, indicating that the afforestation of black locust on the Loess Plateau can not increase the density of soil organic carbon. The stratification study on soil showed that the afforestation of barren hills black locust significantly changed the distribution of organic carbon in the original soil. The results showed that the density of organic carbon increased significantly (33.4%) in 0 ~ 10 cm soil layer, Within the organic carbon density was significantly reduced (45.5%). The total organic carbon density in the soil layer shows that the total organic carbon density in forestland (5.214 kg.m-2) increased significantly compared with the wasteland (4.688 kg.m-2) due to the continuous accumulation of root organic carbon, The exchange rate of 11.2%, indicating Loess Plateau locust afforestation has significant carbon sink capacity.