NCI crowding effects


Most crowding effects must be paired with an NCI term. The NCI term returns one or more values representing different indexes of neighborhood competitiveness. Each crowding effect term can be matched with a variety of different competitiveness indexes and each one below describes how it uses each NCI value it receives.

Default crowding effect

This can be paired with NCI terms returning either one or two values.

Parameters

Parameter nameDescription
NCI Crowding Effect Slope (C) The "C" term in the crowding effect equation.
NCI Crowding Effect Steepness (D) The "D" term in the crowding effect equation.
NCI Size Sensitivity to NCI (gamma) The "gamma" term in the crowding effect equation.

How it works

Crowding Effect is calculated as:

NCI crowding effect equation

where:

The valid ranges on parameter values will depend on the choice of the NCI term.


Crowding effect 2

This can be paired with NCI terms returning either one or two values.

Parameters

Parameter nameDescription
NCI Crowding Effect Slope (C) The "C" term in the crowding effect equation.
NCI Crowding Effect Steepness (D) The "D" term in the crowding effect equation.
NCI Size Sensitivity to NCI (gamma) The "gamma" term in the crowding effect equation.

How it works

Crowding Effect is calculated as:

NCI crowding effect equation

where:

The NCI term is a separate term you select. For a list of options click here. The valid ranges on parameter values will depend on the choice of NCI.


Crowding no size term

This can be paired with NCI terms returning either one or two values, but it will only use one of them.

Parameters

Parameter nameDescription
NCI Crowding Effect Slope (C) The "C" term in the crowding effect equation.
NCI Crowding Effect Steepness (D) The "D" term in the crowding effect equation.

How it works

Crowding Effect is calculated as:

CE = exp(-C * NCI D)

where:

The NCI term is a separate term you select. For a list of options click here. The valid ranges on parameter values will depend on the choice of NCI.


Temperature dependent crowding

In this crowding effect term, plot temperature influences the effects of crowding. This can be paired with NCI terms returning either one or two values.

Parameters

Parameter nameDescription
NCI Crowding Effect C The "C" term in the crowding effect equation.
NCI Crowding Effect CX0 The "X0" term in the crowding effect CT equation.
NCI Crowding Effect CXb The "Xb" term in the crowding effect CT equation.
NCI Crowding Effect D The "D" term in the crowding effect equation.
NCI gamma The "γ" term in the crowding effect equation.

How it works

Crowding Effect is calculated as:

NCI crowding effect equation

where:

NCI crowding effect equation

where:

The NCI term is a separate term you select. For a list of options click here. The valid ranges on parameter values will depend on the choice of NCI.