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首页> 外文期刊>Ecosystems >Wood Decomposition Following a Perennial Lupine Die-Off: A 3-Year Litterbag Study
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Wood Decomposition Following a Perennial Lupine Die-Off: A 3-Year Litterbag Study

机译：多年生羽扇豆死亡后的木材分解：一项为期三年的垃圾袋研究

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Woody debris is a conspicuous feature of many ecosystems and can be a large pool of stored carbon and nutrients. In the California coastal prairie, yellow bush lupines (Lupinus arboreus) experience mass die-offs, producing large quantities of woody detritus. Live lupines are fed upon by the stem-boring caterpillars of the ghost moth, Hepialus californicus, and outbreaks of ghost moths are one factor contributing to lupine die-offs. A common detritivore, the terrestrial isopod Porcellio scaber, frequently inhabits ghost moth tunnels in lupine wood. We used a litterbag experiment to test the hypothesis that H. californicus increases decomposition of woody lupine detritus by facilitating its use by P. scaber. Isopod access to wood was crossed with simulated ghost moth boring to measure the independent and interactive effects of these two arthropods on total mass loss, as well as on carbon, nitrogen, and lignin dynamics. Isopods initially colonized litterbags but were not more abundant on L. arboreus logs that had simulated ghost moth boring than on logs without boring. They were rare in litterbags collected at 12 months or later and had no effect on wood decomposition. Simulated ghost moth boring increased wood decomposition (P = 0.0021), from 50.5 to 55.1% mass loss after 3 years. This effect was likely due to increased surface area for microbial utilization of the wood. Lupine wood had an initial lignin content of 14.70 pl 0.67%, but lignin did not appear to decompose during the 3 years of this study, and by the end of the experiment accounted for 32.6 pl 1.12% of the remaining wood. Neither ghost moth boring nor isopod access affected lignin loss. Lupine wood from a die-off in 2002 was estimated to have contained three times more nitrogen per unit area than the yearly input of annual grass litter. The slow decomposition of lupine wood, however, restricts the rate at which nitrogen is released into the soil and results in the storage of carbon and nutrients in lupine wood for several years following such die-offs.
机译：木质碎片是许多生态系统的显着特征，可以是储存的大量碳和养分的池。在加利福尼亚沿海大草原上，黄色灌木羽扇豆（羽扇豆）大量死亡，产生大量木本碎屑。活的羽扇豆被幽灵蛾（Hepialus californicus）的枯燥的毛毛虫捕食，而幽灵蛾的爆发是导致羽扇豆死亡的一个因素。陆生等足类Porcellio scaber是一种常见的有害生物，经常栖息在羽扇豆木材中的幽灵蛾子隧道中。我们使用了一个垃圾袋实验来检验假说H. californicus通过促进P. scaber的使用来增加木质羽扇豆碎屑的分解。等足动物进入木材与模拟鬼蛾钻探相交，以测量这两种节肢动物对总质量损失以及碳，氮和木质素动力学的独立和交互作用。等脚形动物最初定居在垃圾袋中，但是在模拟鬼蛾无聊的树木L. arboreus原木上比在没有无聊的原木上丰富得多。它们在12个月或更晚时收集的垃圾袋中很少见，对木材分解没有影响。模拟的鬼蛾无聊增加了木材分解（P = 0.0021），三年后质量损失从50.5％下降到55.1％。这种效果可能是由于增加了木材微生物利用的表面积。羽扇豆木材的初始木质素含量为14.70 pl 0.67％，但在此研究的3年中木质素似乎未分解，到实验结束时占剩余木材的32.6 pl 1.12％。鬼蛾无聊和等足动物接触都不会影响木质素的损失。据估计，从2002年死去的羽扇豆木材中，每单位面积的氮含量是每年草料年输入量的三倍。然而，羽扇豆木材的缓慢分解限制了氮释放到土壤中的速率，并导致死后的几年中羽扇豆木材中碳和养分的储存。

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