{ "slug": "2026-09-10-xylem-embolism-containment", "pressure_data": { "paired_points": 61, "species": [ { "species": "R. pseudoacacia", "group": "被子植物", "points": 9, "max_K_difference": 1.1102230246251565e-16, "P_at_Q_peak_MPa": 2.067, "P80_from_supplied_K": null }, { "species": "L. tulipifera", "group": "被子植物", "points": 9, "max_K_difference": 2.220446049250313e-16, "P_at_Q_peak_MPa": 2.067, "P80_from_supplied_K": null }, { "species": "A. rubrum", "group": "被子植物", "points": 9, "max_K_difference": 0.10178300251921846, "P_at_Q_peak_MPa": 2.067, "P80_from_supplied_K": null }, { "species": "T. plicata", "group": "裸子植物（含银杏）", "points": 8, "max_K_difference": 2.220446049250313e-16, "P_at_Q_peak_MPa": 0.39273, "P80_from_supplied_K": { "bracket_MPa": [ 0.39273, 0.6821100000000001 ], "linear_interpolated_MPa": 0.5664816756424635 } }, { "species": "C. duclouxiana", "group": "裸子植物（含银杏）", "points": 8, "max_K_difference": 1.1102230246251565e-16, "P_at_Q_peak_MPa": 0.09646, "P80_from_supplied_K": { "bracket_MPa": [ 0.19292, 0.38584 ], "linear_interpolated_MPa": 0.22656245907704875 } }, { "species": "G. biloba", "group": "裸子植物（含银杏）", "points": 9, "max_K_difference": 5.551115123125783e-17, "P_at_Q_peak_MPa": 0.19292, "P80_from_supplied_K": { "bracket_MPa": [ 0.19292, 0.38584 ], "linear_interpolated_MPa": 0.2581224040161208 } }, { "species": "S. sempervirens", "group": "裸子植物（含银杏）", "points": 9, "max_K_difference": 1.1102230246251565e-16, "P_at_Q_peak_MPa": 0.6579950000000001, "P80_from_supplied_K": { "bracket_MPa": [ 0.6579950000000001, 0.9577100000000001 ], "linear_interpolated_MPa": 0.6858145433013749 } } ], "limits": "Public species-level summaries, not the35individual-sample trajectories; n=5per species is author-reported. Each Q and K normalized within its own species. Error column named se_q_relatif whereas paper caption calls bars SD; preserved, not used as CI. A.rubrum supplied K differs by up to.101783 from K derived from its supplied meanQ; both retained without inventing the reason. P80 interpolation is descriptive within bracketing pressures, not a measured continuous actuation threshold or80percent of pit count closed. Steady water-flow tests do not measure air-arrival timing." }, "interface_and_geometry": { "capillary_example": [ { "chosen_surface_tension_N_m": 0.072, "chosen_pore_radius_nm": 10.0, "ideal_entry_pressure_MPa": 14.399999999999999, "contact_angle_cosine": 1.0 }, { "chosen_surface_tension_N_m": 0.072, "chosen_pore_radius_nm": 50.0, "ideal_entry_pressure_MPa": 2.8799999999999994, "contact_angle_cosine": 1.0 }, { "chosen_surface_tension_N_m": 0.072, "chosen_pore_radius_nm": 100.0, "ideal_entry_pressure_MPa": 1.4399999999999997, "contact_angle_cosine": 1.0 }, { "chosen_surface_tension_N_m": 0.072, "chosen_pore_radius_nm": 500.0, "ideal_entry_pressure_MPa": 0.2879999999999999, "contact_angle_cosine": 1.0 }, { "chosen_surface_tension_N_m": 0.072, "chosen_pore_radius_nm": 1000.0, "ideal_entry_pressure_MPa": 0.14399999999999996, "contact_angle_cosine": 1.0 }, { "chosen_surface_tension_N_m": 0.035, "chosen_pore_radius_nm": 10.0, "ideal_entry_pressure_MPa": 7.000000000000001, "contact_angle_cosine": 1.0 }, { "chosen_surface_tension_N_m": 0.035, "chosen_pore_radius_nm": 50.0, "ideal_entry_pressure_MPa": 1.4, "contact_angle_cosine": 1.0 }, { "chosen_surface_tension_N_m": 0.035, "chosen_pore_radius_nm": 100.0, "ideal_entry_pressure_MPa": 0.7, "contact_angle_cosine": 1.0 }, { "chosen_surface_tension_N_m": 0.035, "chosen_pore_radius_nm": 500.0, "ideal_entry_pressure_MPa": 0.14, "contact_angle_cosine": 1.0 }, { "chosen_surface_tension_N_m": 0.035, "chosen_pore_radius_nm": 1000.0, "ideal_entry_pressure_MPa": 0.07, "contact_angle_cosine": 1.0 } ], "continuity_diagnostic": { "chosen_radius_m": 1e-05, "chosen_length_m": 0.001, "chosen_flow_m3_s": 1e-12, "pit_wall_fraction": 0.0728, "area_pit_over_area_cross": 14.560000000000002, "front_speed_m_s": 0.0031830988618379067, "continuity_average_pit_speed_m_s": 0.000218619427324032, "printed_Eq3_pit_speed_m_s": 0.04634591942835993, "printed_outflow_over_input": 211.99360000000007, "limits": "Diagnostic of the stated area definitions under incompressible flow through the specified total pit area. It does not reproduce Fig3 species pressures or give local stress on a torus. Published and early manuscript Eq3 multiply by the area ratio that continuity requires dividing by. The SI diameter header says mm despite values of tens; unit ambiguity kept, not silently reinterpreted to regenerate the full numerical species claim." }, "closed_volume_thresholds": [ { "group": "angiosperm", "initial_pressure_difference_MPa": 2.936, "actuation_MPa": 0.25, "effective_bulk_modulus_GPa": 5.0, "critical_displaced_volume_fraction": 0.0005371999999999999 }, { "group": "angiosperm", "initial_pressure_difference_MPa": 2.936, "actuation_MPa": 0.75, "effective_bulk_modulus_GPa": 5.0, "critical_displaced_volume_fraction": 0.0004372 }, { "group": "conifer", "initial_pressure_difference_MPa": 4.958, "actuation_MPa": 0.25, "effective_bulk_modulus_GPa": 5.0, "critical_displaced_volume_fraction": 0.0009416 }, { "group": "conifer", "initial_pressure_difference_MPa": 4.958, "actuation_MPa": 0.75, "effective_bulk_modulus_GPa": 5.0, "critical_displaced_volume_fraction": 0.0008416000000000001 } ], "eight_parameter_corners": { "minimum": 0.0001, "maximum": 0.0024500000000000004, "mean": 0.0008850000000000002, "standard_error_of_eight_corners": 0.00030866648668101306, "interpretation": "Eight chosen parameter corners, not independent experimental samples or a confidence interval." }, "limits": "DeltaP=DeltaP0-DeltaV/C and C=V/K need an effective reservoir and no unaccounted drainage during the event. Replacing DeltaV/V by ell/L additionally assumes matching areas and a particular connected volume. No whole-tree closure impossibility theorem follows from that substitution. Young-Laplace examples use chosen static interfaces; real sap, geometry, wetting and connectivity differ." }, "timing": { "cases": [ { "case": "short_pulse", "initial_pulse_MPa": 0.8, "static_threshold_MPa": 0.5, "pressure_decay_time": 0.1, "membrane_response_time": 1.0, "chosen_air_arrival_time": 2.0, "first_contact_time": null, "contact_before_arrival": false, "unconstrained_peak_displacement": 0.12388218922897808, "ODE_max_difference": 6.673361169218239e-10 }, { "case": "long_pulse", "initial_pulse_MPa": 0.8, "static_threshold_MPa": 0.5, "pressure_decay_time": 10.0, "membrane_response_time": 1.0, "chosen_air_arrival_time": 2.0, "first_contact_time": 1.0980990980751848, "contact_before_arrival": true, "unconstrained_peak_displacement": 1.238821892289795, "ODE_max_difference": 8.538680873471094e-11 }, { "case": "fast_response", "initial_pulse_MPa": 0.8, "static_threshold_MPa": 0.5, "pressure_decay_time": 0.1, "membrane_response_time": 0.01, "chosen_air_arrival_time": 2.0, "first_contact_time": 0.010980990980751846, "contact_before_arrival": true, "unconstrained_peak_displacement": 1.2388218922893068, "ODE_max_difference": 6.917466599531963e-11 }, { "case": "air_arrives_earlier", "initial_pulse_MPa": 0.8, "static_threshold_MPa": 0.5, "pressure_decay_time": 10.0, "membrane_response_time": 1.0, "chosen_air_arrival_time": 0.2, "first_contact_time": 1.0980990980751848, "contact_before_arrival": false, "unconstrained_peak_displacement": 1.238821892289795, "ODE_max_difference": 8.538680873471094e-11 } ], "limits": "Chosen exponentially decaying pressure and first-order overdamped membrane displacement. Plot stops at first contact, does not simulate persistent seal, rebound, gas-front dynamics or feedback of changing pit conductance. Arrival time is separately chosen. Threshold.5MPa is illustrative within the experimental range, not a fit to any species' timing." } }