The influence of omnivorous elaterid larvae on the microbial carbon cycle in different forest soils
The influence of omnivorous elaterid larvae on the microbial carbon cycle in different forest soils
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杂食性飞龙幼虫对不同森林土壤微生物碳循环的影响
DOI：
10.1007/bf00379044
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发表时间：
1989
期刊：
影响因子：
2.7
通讯作者：
V. Wolters
中科院分区：
文献类型：
--
作者：
V. Wolters
本文提供了三种不同山毛榉森林土壤生物最活跃层中微生物碳循环的数据。这三种土壤分别是石灰岩上的毛细土(Göttinger Wald，FRG)、新红砂岩上现代土壤的F/H层(Solling Area，FRG)和靠近第二地点的石灰改良区的F/H层。肠道内容物分析表明，亚青霉幼虫是腐殖性的，这种非特异性的取食行为与土壤条件完全无关。~(14)C掺入的差异表明，只有石灰化现代土壤F/H层的幼虫直接影响初级分解生物。然而，幼虫在表层土壤中的挖穴活动间接改变了三种土壤凋落物在凋落层中分解的时间进程。土壤微生物区系占总碳量的2.6%，现代土壤为0.7%，石灰化现代土壤为2.2%。微生物区系的代谢商(qCO_2，10°C)分别为0.0010(mgCO_2-C·mg~(-1)生物质-C·h-1)、0.0034和0.0012。亚麻黄曲线虫幼虫一般使微生物碳库的大小减小(-30%)，并提高微生物区系的代谢商(+50%)。考虑到亚青霉对土壤微生物区系碳周转的非土壤依赖性，土壤节肢动物的挖洞活动通常可以增加初级生产者的养分有效性。这项研究的结果表明，即使在非常不同的土壤条件下，湿润的节肢动物对山毛榉森林土壤微生物碳周转的一些微尺度和中尺度的影响也令人惊讶地相似。相反，对凋落物分解时间进程的长期修正表明，腐殖型节肢动物对腐殖质层形成的影响是土壤特有的。湿性节肢动物在石灰化现代土壤和天然富碱土壤中的作用有很大的不同。结果表明，石灰促进了腐殖化，增加了微花种群内的竞争。因此，亚青霉对石灰基质中14C矿化的负面影响可以通过其对微生物区系的影响来解释，而微生物区系受到碳有效性的强烈限制。
SummaryData are presented on the influence of Athous subfuscus larvae (Coleoptera, Elateridae) on the microbial carbon cycle in the biotically most active horizons of three contrasting beech forest soils: the Ah horizon of a mull soil on limestone (Göttinger Wald, FRG), the F/H horizon of a moder soil on new red sandstone (Solling area, FRG) and in the F/H horizon of a lime ameliorated area close to the second site. Gut content analyses demonstrated that the larvae of A. subfuscus are humiphagous and that this unspecific feeding behaviour is widely independent of soil conditions. Differences in 14C incorporation demonstrated that only the larvae in the F/H horizon of the limed moder soil directly affected primary decomposer organisms. However, the burrowing activity of the larvae in the topsoil indirectly modified the time course of beech leaf-litter decomposition in the litter layer of all three soils. The microflora of the mull soil contained 2.6%, that of the moder soil 0.7% and that of the limed moder soil 2.2% of total C. The metabolic quotient (qCO2, 10°C) of the soil microflora was 0.0010 (mgCO2-C·mg-1 biomass-C·h-1) in the mull soil, 0.0034 in the moder soil and 0.0012 in the limed moder soil. The A. subfuscus larvae generally reduced the size of the microbial C pool (<-30%) and increased the metabolic quotient of the microflora (>+50%). Considering these soil-independent effects of A. subfuscus on the C turnover of the soil microflora, the burrowing activity of humiphagous soil arthropods may generally increase nutrient availability to primary producers. The results of this study reveal that some of the micro- and mesoscale effects of humiphagous arthropods on the microbial carbon turnover in beech forest soils are surprisingly similar, even under very different soil conditions. The long-term modification of the time course of leaf litter decomposition, in contrast, indicates that the influence of humiphagous arthropods on the formation of the humus layer is soil-specific. There are profound differences in the role of humiphagous arthropods in limed moder soils and in naturally base-rich soils. It is concluded that liming increases competition within the microfloral population due to accelerated humification. The negative effect of A. subfuscus on 14C mineralization in the limed substrate could thus be explained by its effects on a microflora that was strongly limited by the availability of carbon.