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首页> 外文期刊>Ecological research >Rates of decomposition and nutrient release of herbivore inputs are driven by habitat microsite characteristics
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Rates of decomposition and nutrient release of herbivore inputs are driven by habitat microsite characteristics

机译：草食动物输入的分解和养分释放速率受栖息地微场所特征驱动

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Ungulates use habitat with differential microclimate characteristics; therefore, fecal inputs to a particular habitat may result in vastly different rates of decomposition and nutrient release. We tested this hypothesis and conducted a 1-year decomposition experiment where we deployed fecal samples from Shiras moose (Alces alces shirasi) and subsequently measured loss of fecal mass, nutrient release captured with resin bags, and associated consequences for nitrogen (N) cycling in soils. The microhabitat type in which fecal samples were deployed influenced rates of decomposition observed; samples experienced faster rates of decomposition in a riparian habitat type than a conifer site. Cumulative nutrient losses as nitrate (NO3 (-)) measured with anion and cation exchange resin bags were significantly higher in the conifer site (0.08 g N/feces) than the riparian site (0.02 g N/feces), whereas ammonium (NH4 (+)) losses, though higher than nitrate losses, were not significantly different between the riparian site (0.40 g N/feces) and the conifer site (0.26 g N/feces) after 1-year. Concentrations of soil NH4 (+) and NO3 (-) beneath the fecal samples in the riparian site were significantly higher relative to control soils after 1 year, but no differences were detected in the conifer site. Cumulatively, our findings supported our hypothesis that fecal deposition by large herbivores can strongly influence nutrient releases to the ecosystem through the decomposition of fecal matter. Such nutrient additions may have direct effects on N cycling in soil and provide valuable inputs that are available for plant uptake and subsequent growth.
机译：调整具有不同微气候特征的使用栖息地；因此，向特定栖息地输入粪便可能导致分解和养分释放的速率大不相同。我们检验了这一假设并进行了为期1年的分解实验，在该实验中，我们从Shiras驼鹿（Alces alces shirasi）采集了粪便样品，随后测量了粪便质量的损失，树脂袋捕获的养分释放以及氮（N）循环的相关后果。土壤。粪便样本的微生境类型影响了观察到的分解速率。在河岸生境类型中，样品经历的分解速率比针叶树遗址更快。针叶树部位（0.08 g N /粪便）的阴离子和阳离子交换树脂袋测得的累积养分损失为硝酸盐（NO3（-））显着高于河岸部位（0.02 g N /粪便），而铵盐（NH4（ +））损失尽管高于硝酸盐损失，但一年后河岸位点（0.40 g N /粪便）和针叶树位点（0.26 g N /粪便）之间无显着差异。一年后，沿河粪便粪便样品下面的土壤NH4（+）和NO3​​（-）的浓度相对于对照土壤显着较高，但在针叶树部位未发现差异。累积地，我们的发现支持了我们的假设，即大草食动物的粪便沉积会通过粪便物质的分解强烈影响营养物质向生态系统的释放。此类营养物添加可能直接影响土壤中的氮循环，并提供可用于植物吸收和后续生长的有价值的投入。

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