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首页> 外文期刊>Oecologia >Changing leaf litter feedbacks on plant production across contrasting sub-arctic peatland species and growth forms
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Changing leaf litter feedbacks on plant production across contrasting sub-arctic peatland species and growth forms

机译：在不同的亚北极泥炭地物种和生长形式上改变凋落物对植物生产的反馈

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摘要

Plant species and growth forms differ widely in litter chemistry, which affects decay and may have important consequences for plant growth via e.g. the release of nutrients and growth-inhibitory compounds. We investigated the overall short-term (9.5 months) and medium-term (21.5 months) feedback effects of leaf litter quality and quantity on plant production, and tested whether growth forms can be used to generalise differences among litter species. Leaf litter effects of 21 sub-arctic vascular peatland species on Poa alpina test plants changed clearly with time. Across all growth forms, litter initially reduced plant biomass compared with untreated plants, particularly litters with a high decomposition rate or low initial lignin/P ratio. In the second year, however, litter effects were neutral or positive, and related to initial litter N concentration (positive), C/N, polyphenol/N and polyphenol/P ratios (all negative), but not to decomposability. Differences in effect size among several litter species were large, while differences in response to increasing litter quantities were not significant or of similar magnitude to differences in response to three contrasting litter species. Growth forms did not differ in initial litter effects, but second-year plant production showed a trend (P < 0.10) for differences in response to litters of different growth forms: evergreen shrubs < graminoids or deciduous shrubs < forbs. While long-persisting negative litter effects were predominant across all growth forms, our data indicate that even within nutrient-constrained ecosystems such as northern peatlands, vascular plant species, and possibly growth forms, differ in litter feedbacks to plant growth. Differences in the composition of undisturbed plant communities or species shifts induced by external disturbance, such as climate change, may therefore feedback strongly to plant biomass production and probably nutrient cycling rates in northern peatlands.
机译：凋落物化学上的植物种类和生长形式差异很大，这会影响腐烂，并可能通过诸如释放养分和抑制生长的化合物。我们调查了叶子凋落物质量和数量对植物生产的总体短期（9.5个月）和中期（21.5个月）反馈影响，并测试了生长形式是否可用于概括凋落物物种之间的差异。随着时间的推移，21种北极亚维管植物群落的叶片凋落物对Poa alpina试验植物的影响明显改变。与所有未经处理的植物相比，在所有生长形式中，凋落物最初都会减少植物的生物量，尤其是分解速率高或初始木质素/ P比值低的凋落物。然而，在第二年，垫料的影响为中性或阳性，与垫料的初始氮浓度（正），C / N，多酚/ N和多酚/ P比率（均为负）有关，但与可分解性无关。几种垫料物种之间的效应大小差异很大，而对增加垫料数量的响应差异不显着，或者与对三种不同垫料物种的响应差异不明显。生长形式在最初的凋落物效应上没有差异，但是第二年的植物生产显示出对不同生长形式的凋落物的反应差异的趋势（P <0.10）：常绿灌木<类草类或落叶灌木<前茅。尽管长期存在的凋落物负面影响在所有生长形式中均占主导地位，但我们的数据表明，即使在营养受限的生态系统（如北部泥炭地，维管植物物种以及可能的生长形式）中，凋落物对植物生长的反馈也会有所不同。因此，北部泥炭地中不受干扰的植物群落组成的差异或由外部干扰（例如气候变化）引起的物种转移的差异可能会强烈反馈植物生物量的生产以及可能的养分循环速率。

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  • 来源
    《Oecologia》 |2007年第2期|251-261|共11页
  • 作者

    Ellen Dorrepaal; Johannes H. C. Cornelissen; Rien Aerts;

  • 作者单位

    Institute of Ecological Science Department of Systems Ecology Vrije Universiteit Amsterdam De Boelelaan 1085 1081 HV Amsterdam The Netherlands;

    Institute of Ecological Science Department of Systems Ecology Vrije Universiteit Amsterdam De Boelelaan 1085 1081 HV Amsterdam The Netherlands;

    Institute of Ecological Science Department of Systems Ecology Vrije Universiteit Amsterdam De Boelelaan 1085 1081 HV Amsterdam The Netherlands;

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  • 正文语种 eng
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  • 关键词

    High latitude; Litter chemistry; Litter decomposition; Phytometer; Plant functional type;

    机译：高纬度;凋落物化学;凋落物分解;比重计;植物功能类型;

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