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首页> 外文期刊>Soil Biology & Biochemistry >UVB exposure does not accelerate rates of litter decomposition in a semi-arid riparian ecosystem
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UVB exposure does not accelerate rates of litter decomposition in a semi-arid riparian ecosystem

机译：在半干旱河岸生态系统中，UVB暴露不会加快垃圾分解的速率

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Aboveground litter decomposition is controlled mainly by substrate quality and climate factors across terrestrial ecosystems, but photodegradation from exposure to high-intensity ultraviolet-B (UVB) radiation may also be important in arid and semi-arid environments. We investigated the interactive effects of UVB exposure and litter quality on decomposition in a Tamarix-invaded riparian ecosystem during the establishment of an insect biological control agent in northern Nevada. Feeding by the northern tamarisk beetle (Diorhabda carinulata) on Tamarix spp. trees leads to altered leaf litter quality and increased exposure to solar UVB radiation from canopy opening. In addition, we examined the dynamics of litter decomposition of the invasive exotic Lepidium latifolium, because it is well-situated to invade beetle-infested Tamarix sites. Three leaf litter types (natural Tamarix, beetle-affected Tamarix, and L. latifolium) differing in substrate quality were decomposed in litterbags for one year in the field. Litterbags were subjected to one of three treatments: (1) Ambient UVB or (2) Reduced UVB (where UVB was manipulated by using clear plastic films that transmit or block UVB), and (3) No Cover (a control used to test for the effect of using the plastic films, i.e. a cover effect). Results showed a large cover effect on rates of decomposition and nutrient release, and our findings suggested that frequent cycles of freeze-thaw, and possibly rainfall intensity, influenced decomposition at this site. Contrary to our expectations, greater UVB exposure did not result in faster rates of decomposition. Greater UVB exposure resulted in decreased rates of decomposition and P release for the lower quality litter and no change in rates of decomposition and nutrient release for the two higher quality litter types, possibly due to a negative effect of UVB on soil microbes. Among litter types, rates of decomposition and net release of N and P followed this ranking: L. latifolium > beetle-affected Tamarix > natural Tamarix. Altered nutrient dynamics with beetle introduction as well as the rapid decomposition rates exhibited by L. latifolium are consistent with vulnerability to secondary invasion. In this desert ecosystem, decomposition and nutrient release were strongly affected by litter type and much less so by UVB exposure.
机译：地上垃圾的分解主要由整个陆地生态系统的基质质量和气候因素控制，但是暴露于高强度紫外线B（UVB）辐射引起的光降解在干旱和半干旱环境中也可能很重要。在内华达州北部建立昆虫生物防治剂的过程中，我们调查了UVB暴露和凋落物质量对入侵Tamarix的河岸生态系统中的分解的相互作用。由Ta柳属的北柳甲虫（Diorhabda carinulata）饲养。树木会导致叶子凋落物质量发生变化，并增加了树冠开口对太阳UVB辐射的暴露。此外，我们检查了外来入侵性小叶锦葵的凋落物分解的动力学，因为它位于入侵甲虫感染的Tamarix地点的位置。在野外用垃圾袋分解三种底物质量不同的叶子凋落物类型（天然natural柳，受甲虫感染的Ta柳和L. latifolium）。垃圾袋接受以下三种处理之一：（1）环境UVB或（2）减少的UVB（其中UVB通过使用可透射或阻挡UVB的透明塑料膜进行处理），以及（3）无遮盖物（用于测试是否有紫外线照射的对照）使用塑料薄膜的效果，即覆盖效果）。结果表明，对分解和养分释放的速率具有很大的掩盖作用，我们的发现表明，频繁的冻融循环以及可能的降雨强度影响了该部位的分解。与我们的预期相反，更多的UVB暴露并未导致更快的分解速度。较高的UVB暴露导致较低质量垃圾的分解和磷释放速率降低，而两种较高质量垃圾的分解和养分释放速率没有变化，这可能是由于UVB对土壤微生物的不利影响。在凋落物类型中，氮和磷的分解率和净释放率遵循该排名：乳杆菌>受甲虫侵染的Ta柳>天然Ta柳。甲虫的引入改变了营养的动态，以及乳杆菌表现出的快速分解速率与二次侵袭的脆弱性相一致。在这个荒漠的生态系统中，分解和养分释放受垫料类型的影响很大，而受UVB暴露的影响则小得多。

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