Terra Preta de Índio as an Emergent Ecological State: Reclassifying a Path-Dependent Attractor from Constructible Substrate

Stuart Lance Wilkins 

Terra Preta de Índio (Amazonian Dark Earth) has resisted reproducible replication despite decades

of study. This perspective advances a falsifiable hypothesis: Terra Preta is not a replicable substrate

but an emergent ecological state arising from path-dependent processes over centuries. It appears

to occupy a deep attractor basin characterized by persistent fertility, resistance to leaching, and

biological self-regulation. A survey of the biochar literature through 2025 is consistent with a

distinctive temporal anomaly: short-term gains (years 1–3) attenuate by years 5–7, with long-term

trials (10–15+ years) showing soil-texture-dependent divergence and persistent management

dependence. In the literature screened through 2025, no multi-year withdrawal study was found to

have documented autonomous convergence toward Terra Preta-like fertility. An operationalized

dynamical model generates distinct predictions—resistance, hysteresis, and basin transitions—that

discriminate the attractor hypothesis from compositional optimization. The framework is

asymmetrically falsifiable: reproducible creation of self-sustaining fertility within decadal

timescales through compositional manipulation alone would refute it. This article defines testable

criteria under which multistability could be established or rejected; it does not claim demonstrated

multistability.