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首页> 外文期刊>Plant and Soil >Season mediates herbivore effects on litter and soil microbial abundance and activity in a semi-arid woodland.
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Season mediates herbivore effects on litter and soil microbial abundance and activity in a semi-arid woodland.

机译：季节介导了草食动物对半干旱林地凋落物和土壤微生物丰度和活性的影响。

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Herbivores can directly impact ecosystem function by altering litter quality of an ecosystem or indirectly by shifting the composition of microbial communities that mediate nutrient processes. We examined the effects of tree susceptibility and resistance to herbivory on litter microarthropod and soil microbial communities to test the general hypothesis that herbivore driven changes in litter inputs and soil microclimate will feedback to the microbial community. Our study population consisted of individual pinon pine trees that were either susceptible or resistant to the stem-boring moth (Dioryctria albovittella) and susceptible pinon pine trees from which the moth herbivores have been manually removed since 1982. Moth herbivory increased pinon litter nitrogen concentrations (16%) and decreased canopy precipitation interception (28%), both potentially significant factors influencing litter and soil microbial communities. Our research resulted in three major findings: (1) In spite of an apparent increase in litter quality, herbivory did not change litter microarthropod abundance or species richness. (2) However, susceptibility to herbivores strongly influenced bulk soil microbial communities (i.e., 52% greater abundance beneath herbivore-resistant and herbivore-removal trees than susceptible trees) and alkaline phosphatase activity (i.e., 412% increase beneath susceptible trees relative to other groups). (3) Season had a strong influence on microbial communities (i.e., microbial biomass and alkaline phosphatase activity increased after the summer rains), and their response to herbivore inputs, in this semi-arid ecosystem. Thus, during the dry season plant resistance and susceptibility to a common insect herbivore had little or no observable effects on the belowground organisms and processes we studied, but after the rains, some pronounced effects emerged..
机译：草食动物可以通过改变生态系统的垃圾质量直接影响生态系统的功能，或者通过改变介导营养过程的微生物群落的组成间接地影响生态系统的功能。我们研究了树木易感性和对草食性的抗性对凋落物节肢动物和土壤微生物群落的影响，以检验草食动物驱动的凋落物输入和土壤微气候变化将反馈到微生物群落的一般假设。我们的研究种群包括对茎蛀蛾（Dioryctria albovittella）敏感或具有抗性的个别松树松树，以及自1982年以来手动去除了蛾子草食动物的易感松树松树。 16％）和减少的冠层降水截留率（28％），这都是影响凋落物和土壤微生物群落的潜在重要因素。我们的研究得出了三个主要发现：（1）尽管凋落物质量明显提高，但食草性并未改变凋落物微节肢动物的丰度或物种丰富度。 （2）然而，对草食动物的敏感性强烈影响了土壤微生物群落（即，抗草食动物和除草食动物树下的丰度比易感树高52％）和碱性磷酸酶活性（即，易感树下比其他树高412％）组）。 （3）在这个半干旱的生态系统中，季节对微生物群落具有强烈影响（即夏季雨后微生物生物量和碱性磷酸酶活性增加），以及它们对草食动物输入的响应。因此，在干旱季节，植物抗性和对常见昆虫草食动物的敏感性对我们研究的地下生物和过程几乎没有或没有观察到的影响，但是在雨后，出现了一些明显的影响。

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