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New Zealand Journal of Forestry Science

Table 6 Regression analyses for RCD against total root length and biomass for roots > 1 and > 2 mm diameter

From: Root system attributes of 12 juvenile indigenous early colonising shrub and tree species with potential for mitigating erosion in New Zealand

Species

Root size class

Root length

Root biomass

r 2

P

Equation

r 2

P

Equation

Coriaria arborea

>1 mm

0.918

< 0.001

y = 0.567x − 0.897

0.806

< 0.001

y = 226.783exp(0.006x)

>2 mm

0.896

< 0.001

y = 0.309x − 0.468

0.807

< 0.001

y = 189.657exp(0.006x)

Myrsine australis

>1 mm

0.801

< 0.001

y = 0.880x − 6.678

0.705

< 0.001

y = 11.959exp (0.073x)

>2 mm

0.803

< 0.001

y = 0.373x − 2.778

0.712

< 0.001

y = 5.121exp(0.077x)

Pseudopanax arboreus

>1 mm

0.788

< 0.001

y = 1.049x − 12.900

0.825

< 0.001

y = 31.135exp(0.042x)

>2 mm

0.782

< 0.001

y = 0.590x − 7.732

0.812

< 0.001

y = 22.349exp(0.044x)

Sophora tetraptera

>1 mm

0.633

< 0.001

y = 1.623x − 13.699

0.652

< 0.001

y = 29.755exp(0.050x)

>2 mm

0.664

< 0.001

y = 0.723x − 6.792

0.685

< 0.001

y = 17.419exp(0.054x)

Cordyline australis

>1 mm

0.828

< 0.001

y = 0.909x − 13.407

0.486

< 0.001

y = 80.922exp(0.014x)

>2 mm

0.744

< 0.001

y = 0.587x − 10.748

0.313

< 0.001

y = 67.463exp(0.012x)

Hoheria populnea

>1 mm

0.799

< 0.001

y = 1.915x − 22.421

0.749

< 0.001

y = 77.360exp(0.033x)

>2 mm

0.981

< 0.001

y = 0.426x − 0.113

0.681

< 0.001

y = 61.306exp(0.032x)

Knightia excelsa

>1 mm

0.676

< 0.001

y = 1.014x − 8.843

0.669

< 0.001

y = 13.747exp(0.051x)

>2 mm

0.546

< 0.001

y = 0.387x − 3.275

0.630

< 0.001

y = 6.967exp(0.057x)

Pittosporum tenuifolium

>1 mm

0.796

< 0.001

y = 2.229x − 21.396

0.760

< 0.001

y = 25.055exp(0.058x)

>2 mm

0.764

< 0.001

y = 1.241x − 12.923

0.742

< 0.001

y = 18.090exp(0.060x)

Pittosporum eugenoides

>1 mm

0.817

< 0.001

y = 3.536x − 42.563

0.903

< 0.001

y = 37.578exp(0.054x)

>2 mm

0.777

< 0.001

y = 19.22x − 24.495

0.885

< 0.001

y = 30.161exp(0.054x)

Coprosma robusta

>1 mm

0.785

< 0.001

y = 1.546x − 18.772

0.918

< 0.001

y = 62.745exp(0.033x)

>2 mm

0.805

< 0.001

y = 0.802x − 11.295

0.906

< 0.001

y = 23.155exp(0.038x)

Plagianthus regius

>1 mm

0.711

< 0.001

y = 2.191x − 44.685

0.942

< 0.001

y = 86.829exp(0.080x)

>2 mm

0.840

< 0.001

y = 0.415x − 18.021

0.917

< 0.001

y = 71.572eexp(0.027x)

Leptospermum scoparium

>1 mm

0.842

< 0.001

y = 0.832x − 3.672

0.935

< 0.001

y = 10.598exp(0.080x)

>2 mm

0.858

< 0.001

y = 0.441x − 2.603

0.971

< 0.001

y = 5.174exp(0.093x)

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