2024-03-182024-03-182022-10-01Shengjie Liu, Jocelyn E. Behm, Yuanyuan Meng, Wei Zhang, Shangwen Xia, Xiaodong Yang, Shenglei Fu, Nitrogen addition enhances the bottom-up effects in the detrital food web, Global Ecology and Conservation, Volume 39, 2022, e02299, ISSN 2351-9894, https://doi.org/10.1016/j.gecco.2022.e02299.2351-9894http://hdl.handle.net/20.500.12613/9951Bottom-up forces play a critical role in structuring communities and trophic interactions in detritus-based food webs, yet the impact of global change factors on these forces has been seldom explored. Here, we investigated the bottom-up effects of N-addition concentrations and methods (canopy and understory addition of N) on the trophic structure of detrital food webs comprising three trophic levels (saprotrophic fungi, Collembola and spiders) in a temperate and subtropical forest. At both forests, we found that high N concentrations significantly increased the concentration of litter N and saprotrophic fungi, and also increased Isotomidae collembolan density, but did not cascade up to the spider predator level. In contrast, the N addition methods had no significant impact on any component of trophic structure at either forest. In conclusion, N concentration significantly influenced trophic structure by bottom-up effects.4 pagesengAttribution-NonCommercial-NoDerivs CC BY-NC-NDhttps://creativecommons.org/licenses/by-nc-nd/4.0/CollembolaForest floorIsotomidaeLitter qualitySaprotrophic fungiSpiderText