第86回 生態適応セミナー

日時 7月9日 [火] 15:30~17:00

場所 東北大学 青葉山キャンパス 生物棟 1階 大会議室

演者 Po-Ju Ke1, Takeshi Miki2, Tzung-Su Ding1 (1School of Forestry and Resource Conservation, National Taiwan University, 2Institute of Oceanography, National Taiwan University)

PLANT TRAIT AND MICROBIAL COMPOSITION INTERACTIVELY DETERMINE SPECIES VARIATION IN PLANT SOIL FEEDBACK – a modeling approach

Interaction of plants with the nearby soil environment, a process termed plant-soil feedback (PSF), is a structuring force for vegetation development. Understanding how plant traits control PSF strength variation among species is thus critical for plant ecology. Studies have highlighted either nutrient cycling (litter-mediated PSF) or soil biota (microbial-mediated PSF) separately as two main drivers of PSF and thus focused on different sets of plant traits. However, the two PSF drivers are not independent and their way of interaction depends on the functional group of associated microbes (i.e. pathogens and mycorrhizas). An ecosystem model coupling indirect interaction between litter and microbes is presented to identify the most influential traits in controlling PSF strength and, its dependence on soil microbial composition. We show that the relative importance of traits altered when microbial-mediated PSF is considered along with litter-mediated PSF. The relative importance of litter decomposability is low in pathogen-rich soils since its positive effect on nutrient cycling is cancelled out by synergic increase in pathogen level. However, its importance increases with the relative abundance of mycorrhizas due to the indirect effects of mycorrhizas on litter dynamics. The model can provide insights into understanding the key determinants of successful plant invasion in different soil environments and give new perspectives to trait-based ecological studies.