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Grass · maximum conductancegrass evidence record

max_conductance3.7
max-conductancegrassbeijingcityZheng Y. 2023

Parameters

Names follow the SUEWS YAML specification; click one for its definition in the configuration reference.

max_conductance3.7

Provenance evidence

Awaiting sign-off

Published value · assessed by provenance-audit · 2026-08-23. Agent assessment is evidence preparation, not human verification.

Simulating heat and CO2 fluxes in Beijing using SUEWS V2020b: Sensitivity to vegetation phenology and maximum conductanceParameter source

Where: Table 4, gmax for the gs and gs_LAI cases, p. 4559

Publishes gmax = 3.7 mm s-1 for the grass surface.

Where: Appendix E, Maximum conductance of urban green space in Beijing, p. 4573

The average gmax for grass is 3.7 mm s-1.

Where: Table E1, Maximum conductance (gmax) for each vegetated surface, p. 4573

Festuca arundinacea 5.4, Poa pratensis 4.0 and Zoysia japonica 1.6; their mean is 3.67, which the text reports as 3.7.

Zheng et al. publish the averaged value that the record stores; the species-level inputs are credited to other authors in Table E1.

Simulating heat and CO2 fluxes in Beijing using SUEWS V2020b: Sensitivity to vegetation phenology and maximum conductanceLater compilation

Where: ModelRuns/Input/SUEWS_Veg.txt, code 993, columns MaxConductance

Carries 3.7 for the grass surface used in the published runs.

Where: ModelRuns/Input/SUEWS_SiteSelect.txt, Beijing grid 1 (2015 and 2016)

Assigns Code_EveTr 991, Code_DecTr 992, Code_Grass 993 and IrrigationCode 5 to the modelled Beijing grid, so those rows are the ones the published runs used.

Confirms that the published value is the one the released runs used.

Assessment findings

Namesupported
Table E1 tabulates the grass surface under its own heading.
Targetsupported
Table 4 and the archived MaxConductance column both attach the value to the grass surface.
Valuessupported
Table 4 gives 3.7; Appendix E derives it from Table E1; the archived Veg code 993 carries the same number.
Sourcesupported
Zheng et al. is the publication in which the stored value first appears.
Placesupported
Table E1 draws the species composition from a field survey over Beijing and the conductances from studies of Beijing species.
Representativenesssupported
Appendix E states that the species average is taken in order to represent the overall vegetation over the urban area in Beijing.
Methodsupported
A species average of published conductances, not a measurement or a fit by Zheng et al. and not an in-database calculation.
Identitysupported
The value occupies its own row in Table 4 and its own Veg code in the archive, distinct from the other two vegetated surfaces.

Scientific note

Appendix E states the purpose of these values plainly: "Here, we seek values that can represent the overall vegetation over the urban area in Beijing, and therefore the average is taken from different species." The species population ratios come from a field survey over Beijing (Ma et al., 2019), so the city label is the paper's own claim rather than an inference. Zheng et al. compile published species-level conductances and average them; the underlying measurements are other authors' and are not registry sources here, so the assessment records the method as literature rather than asserting an in-database derivation.

Model-ready fragment

Paste under land_cover.grass in a SUEWS YAML configuration; every value carries its citation.

max_conductance:
  value: 3.7
  ref:
    ID: zheng-y2023
    DOI: 10.5194/gmd-16-4551-2023
    desc: beijing, city

Evidence review

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Raises a prefilled sign-off issue. CI accepts it only when the issue author is in the verifier registry and the evidence revision is still current.

Review procedure

Record metadata

Placebeijing
Scopecity
Targetland_cover.grass · docs
Origin“Beijing” (verbatim legacy string)
Schema2026.5 · legacy row 33240008

Used by 1 typology

Same study, same place

all 6 sets from zheng-y2023 at beijing →
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