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首页> 外文期刊>Ecological research >Decomposition and nitrogen release from the foliage litter of fir (Abies sachalinensis) and oak [Quercus crispula) under different forest canopies in Hokkaido, Japan
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Decomposition and nitrogen release from the foliage litter of fir (Abies sachalinensis) and oak [Quercus crispula) under different forest canopies in Hokkaido, Japan

机译：日本北海道不同林冠下冷杉（Abies sachalinensis）和橡树（Quercus crispula）的凋落物分解和氮释放

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When two tree species co-occur, decomposition and nitrogen (N) release from the foliage litter depend on two factors: the forest floor conditions under each canopy type and the species composition of the litter. We conducted an experiment using fir and oak to answer several questions regarding decomposition beneath canopies of the two species and the effects of litter species composition on decomposition. We compared the rates of decomposition and N release from three different litters (fir needle, oak leaf, and a mixture of the two) in 1-mm-mesh litterbags on the forest floor under three different canopies (a 40-year-old fir plantation, large oak trees, and mixed fir and oak trees) in Hokkaido, Japan, over a 2-year period. Beneath each of these canopy types, the litter decomposition rate and percentage of N remaining in the litterbags containing a mixture of fir and oak litter were not significantly different from the expected values calculated for litterbags containing litter from a single tree species. Oak leaf litter decomposed significantly faster than fir needle litter beneath each canopy type. The litter decomposition rate was significantly higher beneath the fir canopy than under the oak canopy, and was intermediate under the mixed canopy of fir and oak. No net N release, that is, a decrease in the total N compared to the original amount, was detected from fir litter under each canopy type or from oak leaf litter beneath the oak canopy. N increased over the original amount in the fir litter beneath the oak canopy and the mixed canopy of fir and oak, but N was released from the oak litter under the fir canopy and the mixed canopy of fir and o*ak. These results suggest that oak leaf litter blown onto fir forest floor enhances nutrient cycling, and this might be a positive effect of a mixed stand of conifer and broad-leaved trees.
机译：当两种树木同时存在时，分解和氮（N）从树叶凋落物中释放取决于两个因素：每种树冠类型下的森林地面状况和凋落物的物种组成。我们使用冷杉和橡树进行了一项实验，回答了有关这两个树冠下的分解以及凋落物种类组成对分解的影响的几个问题。我们比较了三种不同冠层（一棵40岁的杉木）在森林地面上1毫米网孔垃圾袋中，三种不同凋落物（冷杉针，橡树叶和二者的混合物）的分解和氮释放速率。日本北海道的人工林，大橡树以及杉树和橡树混合树，为期2年。在这些冠层类型的每种类型下，包含杉木和栎木垃圾混合物的垃圾袋中的垃圾分解速率和残留的N百分比与针对单一树种的垃圾袋所计算的预期值没有显着差异。在每种类型的树冠下，橡树叶凋落物的分解速度都比杉木针凋落物快得多。杉木冠层下的凋落物分解速率显着高于橡木冠层下的分解速率，在杉木和栎木混合冠层下的凋落物分解速率中等。没有从每种树冠类型下的杉木凋落物或在橡木树冠下的橡树叶凋落物检测到净氮释放量，即总氮量与原始量相比没有减少。氮比橡木冠下的冷杉凋落物和杉木与栎木的混合冠层中的原始量增加，但是氮从杉木冠层下的杉木凋落物和杉木与栎木的混合冠层中释放出来。这些结果表明，吹散在杉木林地上的橡树叶凋落物可促进养分循环，这可能是针叶树和阔叶树混交林的积极影响。

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