Viernes 17 de octubre 2025 · 11:00 am · Auditorio I, campus III, INECOL

https://us02web.zoom.us/j/88164153933?pwd=h2qVHsZMfazzJvuGFhaErumDWvEzMR.1

Topic 1

C sequestration under agroforestry: Processes, consequences & future potentials

Agroforestry (AF) has the potential to restore degraded lands, provide a broader range of ecosystem goods and services such as carbon (C) sequestration and high biodiversity, and increase soil fertility and ecosystem stability through additional C input from trees, erosion prevention, and microclimate improvement. Mean soil C stocks in AF (1‐m depth) are 19% more than that in croplands or pastures. Advantages of AF ecosystem services focusing on mechanisms of belowground C sequestration were analyzed. AF systems could greatly contribute to global soil C sequestration if used in larger areas.

Topic 2

Competition of bacteria and fungi for soil resources 

Among various interactions, competition for resources is the main factor determining the adaptation and niche differentiation between microbial groups in soil because C and energy limitations for microbial growth are very common in soil. The C and energy demands of bacteria and fungi, and the mechanisms of their competition for these and other resources, leading to niche differentiation will be discussed. Bacteria are 1.4–5 times more efficient in the uptake of simple organic compounds as substrates, whereas fungi are 1.1–4.1 times more effective in utilizing complex compounds. Accordingly, bacteria strongly outcompete fungi for simple substrates, while fungi take advantage of complex compounds. Based on these specifics, we differentiated spatial, temporal, and chemical niches for these two groups in soil. The competition will increase under the main five global changes including elevated CO₂, N deposition, soil acidification, global warming, and drought. Elevated CO₂, N deposition, and warming increase bacterial dominance, whereas soil acidification and drought increase fungal competitiveness.