Opened 8 months ago

Closed 8 months ago

#870 closed task (fixed)

Add forest output to better match NFI data

Reported by: luyssaert Owned by: somebody
Priority: minor Milestone: ORCHIDEE 4.3
Component: Anthropogenic processes Version: trunc
Keywords: Cc:

Description (last modified by luyssaert)

NFI data rarely measure trees below 7 to 10 cm in diameter (depending on the country). The current ORCHIDEE output is based on all trees. Ask the user for a threshold diameter and calculate the classic NFI outputs based on this threshold. Variables to which this could apply: IND, BA, QMDIA, QMHEIGHT.

Change History (2)

comment:1 Changed 8 months ago by luyssaert

  • Description modified (diff)

comment:2 Changed 8 months ago by luyssaert

  • Resolution set to fixed
  • Status changed from new to closed

ORCHIDEE calculates the HEIGHT, DIAMETER, BA, and IND for the whole stand including saplings. Forest inventories use a diameter threshold below which trees are not sampled. The HEIGHT, DIAMETER, BA, and IND from a forest inventory cannot simply be compared to the ORCHIDEE simulations.

In r7773 a cut off diameter has been implemented in ORCHIDEE (DIA_THRESH_INV) and enables the model to calculate the simulated HEIGHT, DIAMETER, BA, and IND for the whole stand as well as these variables as if they would be measured in a forest inventory. These variables are written to the history file as HEIGHT, HEIGHT_DOM, HEIGHT_INV, DIAMETER, DIA_DOM, DIA_INV, BA, BA_INV, IND, and IND_INV.

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