Table 13 Nonlinear functional relationship between survival pressure and DBH in a community.

From: Interspecific competition and survival pressures in endangered Barringtonia racemosa populations of Mainland China

Community name

Formula

Function Name

JLS-B and SX-B

y = y0 + A/t0 *exp (0.5*(w/t0) ^2-(x-xc)/t0) * (erf (z/sqrt (2)) + 1)/2

GaussMod

JLS-T

y = y0 + (A/(w*sqrt(pi/2))) *exp(-2*((x-xc)/w) ^2)

Gauss

SX-A

double z = (x-xc)/w; y = y0 + 4*A*exp(-z) / (l + exp (-z)) ^2

Logistpk

SX-S

double z = (x-xc)/w; y = y0 + A*exp(-exp(-z)-z + 1)

Extreme

SX-AI

y = y0 + (A/(w*sqrt(pi/2))) *exp(-2*((x-xc)/w) ^2)

Gauss

SX-P

y = y0 + (A/(w*sqrt(pi/2))) *exp(-2*((x-xc)/w) ^2)

Gauss

  1. DBH: Diameter at breast height; JLS-B: Jiulong mountain B. racemosa community; SX-B: Suixi county B. racemosa community; JLS-T: Jiulong mountain T. tiliaceum-B. racemosa community; SX-A: Suixi county B. racemosa-A. aureum community; SX-S: Suixi county S. apetala-B. racemosa com-munity; SX-AI: Suixi county B. racemosa-A. ilicifolius community; SX-P: Suixi county P. pinnata-T. tiliaceum-B. racemosa community.
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