VPDThresholdNTE: Zero method that uses a threshold vapor-pressure deficit...
In bmcnellis/sapflux: Analyze Sapflux Traces

Description Usage Arguments Details References See Also Examples

This function uses a threshold minimum vapor pressure deficit that serves as an indicator of probable 'zero-flow' conditions.

Not implemented yet.

1	VPDThresholdNTE(flux, time, vpd, threshold = 0.01, limit = 15)

`flux`	'flux' class object
`time`	'time' vector, must be same length as data.
`vpd`	Vapor-pressure deficit vector, must be same length as time.
`threshold`	Zero-flow VPD threshold, in kPA
`limit`	Time limit, in days, in which to find a VPD threshold.

The time limit serves to limit how far back or forward a dT maximum is looked for. This can solve computation errors as well as limit the effect that mean daily temperature has on dT maximums. For example, a dT max of 40C might be valid in California during the summer, but the same probes at zero flow may max out at 20C in boreal Canada during March.

The time limit has units of full days and extends forward and backward of the measurement.

Kavanagh, K., Pangle, R., D Schotzko, A., 2007. Nocturnal transpiration causing disequilibrium between soil and stem predawn water potential in mixed conifer forests of Idaho. Tree physiology 27, 621–9. https://doi.org/10.1093/treephys/27.4.621

Other zero: ByColumnOmitNTE, GranierConversions