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OALib Journal期刊
ISSN: 2333-9721
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黄土高原刺槐人工幼林碳密度动态变化
DOI: 10.3969/j.issn.1000-2006.2013.02.005, PP. 28-32
Keywords: 有机碳,幼龄刺槐林,碳汇,林地,黄土高原
Abstract:
为研究黄土高原幼龄人工刺槐林地生态系统的有机碳动态变化规律,对刺槐林地在造林后4个阶段(造林2、4、6、9a)生态系统各层次的有机碳储量进行了持续的监测与调查。结果表明:造林在2a内对林地有机碳储量影响微小;造林2a后,林地生态系统各层次有机碳密度均会随着林龄的增大而呈规律性变化,其中土壤层和乔木层为生态系统有机碳的主要来源,土壤层有机碳密度及其在林地有机碳密度中所占的比例随着林龄的增大而减小,乔木层有机碳密度呈相反变化趋势。由此,黄土高原人工刺槐林生态系统有机碳密度随着林龄的增大而增加,与荒地相比,林地有机碳密度分别增加了6.2%、5.21%、21.81%和38.20%,表明黄土高原人工刺槐林在造林后会逐步发挥其显著的碳汇能力。
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