The Intraspecific Advantage
Traditional Earth System Models (ESMs) assign static hydraulic traits to entire plant functional types (PFTs). The Nature research demonstrates that individuals within a single species vary dramatically in xylem resistance (P50), rooting depth, and turgor loss point. This spread prevents uniform catastrophic cavitation.
Xylem Cavitation & PLC
Percent Loss of Conductivity follows a sigmoidal vulnerability curve:
PLC = 100 / (1 + exp(a · (Ψ - P50))). When water tension exceeds the threshold, air embolisms rupture xylem conduits. With ITV, resilient sub-populations retain sap transport and seed the canopy recovery.
Microclimates & Soil Buffering
Heterogeneous root depths tap into varied moisture horizons. Deep-rooted individuals perform hydraulic lift, sustaining surrounding shallow-rooted understory trees during extreme El Niño oscillations and prolonged vapor pressure deficits.