Plant community composition and an insect outbreak influence phenol oxidase activity and soil-litter biochemistry in a sub-Arctic birch heath
Plant community composition and an insect outbreak influence phenol oxidase activity and soil-litter biochemistry in a sub-Arctic birch heath
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植物群落组成和昆虫爆发影响亚北极桦树石南酚氧化酶活性和土壤凋落物生物化学
DOI：
10.1007/s00300-014-1613-8
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发表时间：
2015
期刊：
影响因子：
1.7
通讯作者：
Jones A
中科院分区：
文献类型：
--
作者：
Jones A
北极土壤的分解速度受温度和湿度的影响，但底物的有效性受植被投入的影响，而植被投入也受生物影响。在这里，我们研究了来自单个矮灌木物种的叶子和凋落物输入如何影响瑞典阿比斯科亚北极石南群落的土壤酶活性。我们进一步考虑了通过昆虫食草性(和暴发)造成的叶片损害如何影响土壤群落和分解。在生长高峰期(2011年7月)，我们评估了灌木群落的组成。测定凋落物和土壤酚氧化酶活性。在接下来的一年(2012年7月)，秋蛾幼虫周期性的严重暴发影响了这个群落，我们利用这一点来研究它与酚氧化酶活性、土壤呼吸、可溶性NH4+和可溶性酚类的关系；可溶性因素与昆虫幼虫废物(FRAS)的输入直接相关。在暴发前(2011年)，观察到的最强关系是较高的酚氧化酶活性与。雌雄同体。在暴发年(2012年)，酚氧化酶活性与落叶树种的危害关系最强。没药，具有更强的食草性降低活性。对于其他落叶树种，弧菌、土壤NH4+和酚类物质与叶部幼虫的危害呈负相关。常绿植物的食草性对酚氧化酶活性没有影响，但二者之间存在很强的正相关关系。两性群落丰富度与土壤呼吸。我们强调E的主导作用。雌雄同体在这种亚北极灌木群落中存在，并表明即使在昆虫暴发期间，它也可以决定土壤过程。
Rates of decomposition in Arctic soils are regulated by temperature and moisture, but substrate availability is dictated by vegetation inputs, which are also subject to biotic influences. Here, we examine how leaf and litter inputs from individual dwarf shrub species influence soil enzyme activity in a sub-Arctic heath community in Abisko, Sweden. We further consider how foliar damage via insect herbivory (and outbreak) affects the soil community and decomposition. During the peak growing season (July 2011), we assessed how shrub community composition (Empetrum hermaphroditum,Vaccinium myrtillus,V. uliginosumandV. vitis-idaea) determined litter and soil phenol oxidase activity. A periodic severe outbreak of autumn moth larvae (Epirrita autumnata) affected this community in the following year (July 2012), and we used this to investigate its impact on relationships with phenol oxidase activity, soil respiration, soluble NH4+and soluble phenolics; the soluble factors being directly associated with inputs from insect larval waste (frass). Pre-outbreak (2011), the strongest relationship observed was higher phenol oxidase activity withE. hermaphroditumcover. In the outbreak year (2012), phenol oxidase activity had the strongest relationship with damage to the deciduous speciesV. myrtillus, with greater herbivory lowering activity. For the other deciduous species,V. uliginosum, soil NH4+and phenolics were negatively correlated with foliar larval damage. Phenol oxidase activity was not affected by herbivory of the evergreen species, but there was a strong positive relationship observed betweenE. hermaphroditumcommunity abundance and soil respiration. We highlight the dominant role ofE. hermaphroditumin such sub-Arctic shrub communities and show that even during insect outbreaks, it can dictate soil processes.