Mixed Forest Resilience

DISCLAIMER — Real Science, Deliberately Includes a Complication, No Framework Bridge

Why no UTAC/CREP/AFET bridge: not only because the cited literature already provides the necessary quantitative structure -- a deliberate choice. This project's highly speculative AFET/UTAC experiments must never stand in the way of climate/ecology topics being accessible and usable to people who don't work inside that construct and aren't looking for renormalization groups. Real, checkable science, without the burden of an unproven framework. See PACKAGE_REGISTRY.md's "Why no UTAC/CREP/AFET bridge in the climate/ecology series" (2026-08-31) in the GenesisAeon workspace root for the full canonical note.

Status: Real, independently verified science, including a real complication of the package's own headline narrative. NO UTAC/CREP/ AFET bridge.

What this is

Every citation was checked directly against the paper/DOI on 2026-08-17.

• Pretzsch, H., Schuetze, G. (2009), *European Journal of Forest
• Research*, 128, 183-204, DOI: 10.1007/s10342-008-0215-9 — a real,
• 37-plot Central European study of spruce-beech overyielding.
• Jactel, H., Brockerhoff, E.G. (2007), Ecology Letters, 10(9),
• 835-848, DOI: 10.1111/j.1461-0248.2007.01073.x — a real, 119-study
• worldwide meta-analysis.
• Jactel, H., Scherer-Lorenzen, M., et al. (2025), *Journal of
• Pest Science*, 99(1), DOI: 10.1007/s10340-025-01995-y — real field
• evidence from Germany's MyDiv experiment.
• Bosela, M., et al. (2025), Forest Ecology and Management,
• 591, 122829, DOI: 10.1016/j.foreco.2025.122829 — a real 24-year
• paired field comparison in Slovakia.
• Obladen, N., et al. (2021), *Agricultural and Forest
• Meteorology*, 307, 108482, DOI: 10.1016/j.agrformet.2021.

…

mixed-forest-resilience-utac

GenesisAeon Package 113 — why structurally diverse forests outperform monocultures. Extracted from an independent assessment of a German nature-conservation policy report — its forest-conversion (Waldumbau) section was the one part worth pursuing as durable science, separate from the funding-program/legal-framework content in the rest of that document (deliberately not built, same precedent as mountain- governance-adaptation-utac (P104) and landscape-restoration- hydrology-utac/urban-green-infrastructure-utac (P107/P108)). Deliberately has no UTAC/CREP/AFET bridge — see DISCLAIMER.md.

For a plain-language explanation of the same topic (German, no jargon, written for general audiences), see WHITEPAPER.md.

Deliberately not one-sided

This package includes a real complication, not just confirmation: is_beech_immune_to_drought_mortality() returns False — European beech, the tree species most often promoted as spruce's resilient alternative, still died at a real, measured rate (~7%) in the same 2018–2019 drought that killed ~50% of sampled spruce. Mixed-forest resilience is a large, real reduction in risk — not immunity.

What's real here

• Pretzsch & Schütze (2009, European Journal of Forest Research)
• — 37 real experimental plots across Central Europe (age 37–155
• years): mixed Norway spruce/European beech stands produce up to
• 59% more aboveground biomass than neighboring pure stands — but
• this is site-dependent, ranging from −46% to +138%, not a universal
• constant.
• Jactel & Brockerhoff (2007, Ecology Letters)* — a real,
• worldwide meta-analysis of 119 studies: tree diversity reduces
• insect herbivory via "associational resistance" — strong and
• consistent for host-specialist insects, more variable for
• generalists.
• Jactel, Scherer-Lorenzen et al. (2025, Journal of Pest
• Science)* — real field evidence from Germany's MyDiv tree-
• diversity experiment (established 2003): bark beetle (*Ips
• typographus*) damage decreased significantly as the proportion of
• spruce in mixed plots decreased — directly relevant to Germany's
• real, ongoing spruce-monoculture dieback crisis.
• Bosela et al. (2025, Forest Ecology and Management)* — a real
• 24-year paired field comparison in Slovakia (70-year-old spruce
• monoculture vs. 150-year-old mixed forest, identical soils): the
• 2022 drought significantly reduced growth and soil CO₂ efflux in
• the monoculture, while the mixed forest stayed stable.
• Obladen et al. (2021, Agricultural and Forest Meteorology)* —
• the honesty-check citation: real field sampling in Bavaria (186
• spruce, 143 beech trees) found ~50% spruce mortality but also ~7%
• beech mortality in the 2018–20

…