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Elevated atmospheric CO2 lowers leaf litter nutritional quality for stream ecosystem food webs

机译:大气CO2浓度升高会降低溪流生态系统食物网的凋落物营养质量

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Up to 99% of the carbon fuelling the food webs of temperate woodland streams is derived from inputs of terrestrial leaf litter. Aquatic bacteria, fungi, and detritivore invertebrates directly utilize these inputs, transferring this energy to other components of the food web. Increases in atmospheric CO2 could indirectly impact woodland stream food webs by chemically altering leaf litter. This study evaluated CO2-induced chemical changes in aspen (Populus tremuloides) leaf litter, and the corresponding effects on stream bacteria, fungi and leaf-shredding cranefly larvae (Tipula abdominalis: Diptera). Leaf litter from plants grown under elevated CO2 had decreased nutritional value to aquatic decomposers and detritivores because of higher levels of structural compounds and lower nitrogen content. Consequently, elevated CO2-grown leaf litter supported 59% lower bacterial production in a stream than litter grown at ambient CO2 levels, while not affecting fungal biomass. Larval craneflies fed elevated CO2-grown microbially colonized leaves consumed less, assimilated less, and grew 12 times slower than their ambient fed counterparts.
机译:温带林地食物流中高达99%的碳来自陆生落叶。水生细菌,真菌和有害无脊椎动物直接利用这些输入,将这种能量转移到食物网的其他组成部分。大气中二氧化碳的增加可能通过化学改变落叶而间接影响林地的食物网。这项研究评估了CO2诱导的白杨(Populus tremuloides)叶片凋落物的化学变化,以及其对溪流细菌,真菌和切叶扬蝇幼虫(Tipula Southeastis:Diptera)的相应影响。由于较高的结构化合物含量和较低的氮含量,在较高的CO2浓度下生长的植物的叶子凋落物对水生分解物和有害生物的营养价值降低。因此,与在环境CO2水平下生长的凋落物相比,升高的CO2生长的叶片凋落物在河流中的细菌产量降低了59%,同时不影响真菌生物量。饲喂高浓度CO2生长的微生物定殖的幼虫,其叶片消耗量少,被吸收少,并且生长速度比周围饲喂的同龄幼虫慢12倍。

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