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首页> 外文期刊>Plant and Soil >Effects of elevated CO2 and O3 on leaf litter phenolics and subsequent performance of litter-feeding soil macrofauna.
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Effects of elevated CO2 and O3 on leaf litter phenolics and subsequent performance of litter-feeding soil macrofauna.

机译：CO2和O3浓度升高对凋落物酚类物质和饲喂凋落物的大型动物的影响

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Two field-growing silver birch (Betula pendula Roth) clones (clone 4 and 80) were exposed to elevated CO2 and O3 for three growing seasons (1999-2001). The phenolic compounds of naturally abscised leaf litter were analysed in order to determine the possible CO2- and O3-induced changes in the litter quality. The potential litter-mediated CO2 and O3 effects on litter-feeding soil macrofauna (detritivore) performance were assessed in microcosm experiments, i.e., the relative growth rates (RGR) of Lumbricus terrestris and Porcellio scaber, the relative consumption rates (RCR) of P. scaber, and mortality of the test animals were measured. The leaf litter grown under elevated CO2 had increased concentrations (weight per mass unit) and contents (weight per leaf) of phenolic acids, flavonol glycosides, condensed tannins and total measured phenolics. Elevated O3 increased the concentrations of 3,4'-dihydroxypropiophenone 3- beta -D-glucoside (DHPPG) and flavonoid aglycones but only under ambient CO2. However, elevated O3 effects on the content of some low-molecular-weight phenolic (LMWP) compounds (i.e. phenolic acids, DHPPG, flavonoid aglycones) and total LMWP changed over time emphasizing the importance of conducting long-term (>3 years) exposure studies. In general, RGR of young L. terrestris was affected by the litter quality changes induced by elevated CO2 and O3, as the animal growth rates were reduced when they were fed with CO2- and O3-exposed leaf litter of clone 80 in Experiment 1. P. scaber RCR or RGR responses to CO2- and O3-induced changes in litter quality were more variable and inconsistent, and neither were there any litter-mediated CO2 and O3 effects on animal mortality in these microcosm experiments. In conclusion, elevated CO2 has the potential to alter silver birch leaf litter quality, but the possible O3 effects on phenolic compounds and litter-mediated CO2 and O3 effects on detritivores are more difficult to validate..
机译：将两个田间生长的白桦（Betula pendula Roth）克隆（克隆4和80）在三个生长季节（1999-2001年）暴露于升高的CO2和O3中。分析了自然脱落的凋落物中的酚类化合物，以确定可能由CO2和O3引起的凋落物质量变化。在微观实验中评估了凋落物介导的CO2和O3对饲喂土壤大型动物（有害动物）性能的潜在影响，即Lu的mb和Por的相对生长率（RGR），磷的相对消耗率（RCR）测量了实验动物的脊柱疼痛和死亡率。在二氧化碳浓度升高的条件下生长的凋落物具有更高的浓度（每质量单位的重量）和酚酸，黄酮醇苷，缩合单宁和总酚含量的含量（每片重量）。 O3升高会增加3,4'-二羟基苯乙酮3-β-D-葡萄糖苷（DHPPG）和类黄酮苷元的浓度，但只能在环境CO2下。但是，O3对某些低分子量酚类（LMWP）化合物（即酚酸，DHPPG，类黄酮苷元）和总LMWP含量的影响随着时间的推移而变化，强调了进行长期（> 3年）暴露的重要性学习。通常，年轻的陆地藜的RGR受CO2和O3升高引起的凋落物质量变化的影响，因为在实验1中饲喂暴露于CO2和O3的克隆80的叶子凋落物会降低动物的生长速度。 P. scaber RCO或RGR对CO2和O3引起的垫料质量变化的响应更加可变且不一致，在这些微观实验中，垫料介导的CO2和O3对动物死亡率均无影响。总之，升高的CO2可能会改变白桦叶凋落物的质量，但是更难确定O3对酚类化合物的影响以及凋落物介导的CO2和O3对有害菌的影响。

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