Lacustrine carbon burial flux serves as sensitive recorders of the earth surface process， yet disentangling anthropogenic forcing from natural variability in plateau ecosystems remains a key challenge for Quaternary sciences. Here， we integrate structural equation modeling (SEM) and binary model with historical geographical data to analyze 3500-year multi-environmental records from nine lakes spanning the vertical zonation of the Yunnan Plateau (1500-4200 m asl). Here， we employed binary and structural equation models (SEM) to explore the interplay of organic-inorganic carbon (TOC-TIC) burial and anthropogenic forcing in regulating mechanisms across Yunnan Plateau lakes. Our findings indicated pronounced geographic divergence in organic-inorganic carbon synergies， with alpine lakes (>3000 m) exhibiting substantial negative TOC-TIC coupling (
r=0.47，
p<0.001)， contrasting sharply with positive synergistic gains in transitional and urban-agglomerated lowland lakes (
r=0.58，
p<0.001). Notably， we quantified critical thresholds in watershed socio-ecological capacity，nutrient flux contributions to carbon burial surged from 0.73 to 0.88 when human pressure. Political unification events triggered cascading phase transitions through "migration-agriculture-nutrient" feedbacks， reducing lacustrine carbon sink capacity by 3.3%-34.0%. Our study highlights political consolidation as a critical socio-ecological threshold. These insights establish mountain vertical zonation as a geographic modulator of carbon-climate-human interactions， where elevation gradients control the dominance of climate-driven versus anthropogenic-coupled carbon sequestration processes. Meanwhile， this study offers a paradigm for balancing carbon sink conservation with sustainable development in global montane regions， prioritizing protection of climate-vulnerable high-altitude carbon reservoirs under accelerating anthropogenic pressure.
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