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OALib Journal期刊
ISSN: 2333-9721
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三峡库区防护林土壤有机碳的累积
DOI: 10.3969/j.issn.1000-2006.2013.02.003, PP. 15-20
Keywords: 三峡库区,退耕还林,土壤有机碳
Abstract:
退耕还林等土地利用变化影响着土壤有机碳(soc)的累积。笔者设置la(天然马尾松林地)、lb(桤木林地,2002年营造,之前为玉米地)、lc(玉米地)3类采样区,将土样按粒径分为3类,再分离为8种土壤团聚体组分,测定所有组分soc和δ13c值。利用土壤团聚体组分和稳定性碳同位素(13c)技术探讨三峡库区农地造林后soc的动态累积机制。结果表明:农耕使0～10cm土层的soc密度降低了57.2%,≥10～30cm土层的降低了32.2%;而退耕造林11a后的桤木林0～10cm土层的soc密度增加了34.5%,≥10～30cm土层的增加了42.9%;其中源自桤木林的“新碳”在0～10cm土层中占48%,≥10～30cm土层占52%,土壤原先存储的“旧碳”仅损失了9.2%,造林增加soc含量的原因可能是增加了“新碳”的固定能力,加强了对原存贮的“旧碳”的物理保护。
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