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OALib Journal期刊
ISSN: 2333-9721
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不同林龄油松针叶凋落物初期分解特性比较
DOI: 10.3969/j.issn.1000-2006.2013.02.007, PP. 39-44
Keywords: 针叶凋落物,林龄,分解,养分释放,油松
Abstract:
应用凋落袋法,研究了北京山区24、32、40年生油松(pinustabulaeformis)人工林针叶凋落物初始化学组成、分解速率以及养分释放过程。结果表明:凋落物初始基质无机养分含量、灰分、粗蛋白、c/n在3个林龄之间差异性明显(p<0.05)。凋落物失重率季节动态变化表现为双峰型,且季节变化明显。随着林龄的增大,针叶凋落物年平均分解速率、分解系数k值逐渐增大。通过重复测量设计的方差分析可知,随着分解时间的延长,失重率、n剩余百分率在不同林龄间均有显著性差异,而p、k、ca、mg元素的积累释放受林龄影响不明显(p<0.05)。
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