微型动物
生物
氮气循环
食草动物
矿化(土壤科学)
农学
根际
土壤生物学
生态学
植物
土壤水分
氮气
化学
动物群
遗传学
有机化学
细菌
作者
Junwei Hu,Ummehani Hassi,Mesfin Tsegaye Gebremikael,Kenneth Dumack,Tom De Swaef,Wim Wesemael,Steven Sleutel,Stefaan De Neve
标识
DOI:10.1016/j.soilbio.2023.109093
摘要
Both herbivorous and bacterivorous microfauna have been shown to influence root development, soil nitrogen (N) mineralization, and plant productivity. However, our knowledge of these effects is limited as multitrophic interactions remain largely unexplored. We investigated whether and how herbivorous nematodes (Pratylenchus zeae) and bacterivorous nematodes (Poikilolaimus oxycercus), alone and in combination, affect plant biomass (Lolium multiflorum) through root traits and/or soil N mineralization. Bacterivorous nematodes increased, whereas herbivorous nematodes decreased, plant productivity. We found that root trait coordination in response to soil microfauna was consistent with the concept of root economics space. The negative interaction between herbivorous and bacterivorous nematodes on plant productivity at high herbivorous nematode infestation could be explained by reduced N mineralization and variation in the root nitrogen concentration-root tissue density (RNC-RTD) axis aligned with increased herbivory intensity. This study revealed that herbivorous and bacterivorous nematodes moderated each other's effect on plant productivity via root trait coordination and N mineralization, and suggests, for the first time, the value of the root economics space concept for interpreting phenotypic root plasticity and functioning in response to local biotic factors.
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