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首页> 外文期刊>Plant and Soil >Transformation and mineralization of soil organic nitrogen by the humivorous larva of Pachnoda ephippiata (Coleoptera: Scarabaeidae)
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Transformation and mineralization of soil organic nitrogen by the humivorous larva of Pachnoda ephippiata (Coleoptera: Scarabaeidae)

机译：斑潜蝇（Pachnoda ephippiata）（鞘翅目：Scarabaeidae）的有丝幼虫对土壤有机氮的转化和矿化作用

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摘要

We studied transformation and mineralization of nitrogenous soil polymers by the humivorous larva of the scarabaeid beetle Pachnoda ephippiata, using super(14)C-labeled peptides, peptidoglycan, and chitin, both native and stabilized by co-polymerization with synthetic humic acids. The results indicated that these materials were solubilized mainly in the alkaline midgut. The solubilization rate of peptides to TCA-soluble products was higher than those of peptidoglycan and chitin. Solubilization rates were lower when the polymers were stabilized in humic acids. Incubation of soil with midgut fluid released amino acids, which explains the high in vivo concentrations of amino acids observed in the midgut fluid. The large amounts of [Equation] in the fresh fecal pellets indicated that at least 1.7% of the total nitrogen (7% of the acid-hydrolyzable peptides) in the ingested soil was mineralized during gut passage; also the amount of soluble protein and the solubility of humic substances increased. The combined evidence supports the hypothesis that not only microbial biomass but also the nitrogen-rich components of humus are important dietary components for humivorous insects, and that feeding activities of soil macroinvertebrates strongly impact transformation and mineralization of soil organic matter.
机译：我们研究了使用超级（14）C标记的肽，肽聚糖和几丁质，由天然的和通过与合成腐殖酸共聚而稳定化的金龟子甲虫Pachnoda ephippiata的半透明幼虫对含氮土壤聚合物的转化和矿化作用。结果表明，这些物质主要溶解在碱性中肠中。肽对TCA可溶产物的溶解速率高于肽聚糖和几丁质。当聚合物在腐殖酸中稳定后，增溶速率会降低。用中肠液孵育土壤会释放出氨基酸，这解释了在中肠液中观察到的体内氨基酸浓度很高。新鲜粪便颗粒中大量的[等式]表明，在消化道中，摄入的土壤中至少有1.7％的总氮（酸水解性肽的7％）被矿化;可溶性蛋白质的量和腐殖质的溶解度也增加了。综合证据支持以下假说：不仅微生物生物质，而且腐殖质的富氮成分都是食性昆虫的重要饮食成分，土壤大型无脊椎动物的摄食活动强烈影响土壤有机质的转化和矿化。

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