Above- and belowground tree biomass models for three mangrove species in Tanzania: a nonlinear mixed effects modelling approach

Table 2 Statistical summary of plot variables, sample tree variables, and tree biomass for different tree components

Item	A. marina				S. alba				R. mucronata
Item	n	Mean ± STD	Min	Max	n	Mean ± STD	Min	Max	n	Mean ± STD	Min	Max
Plot variables^a
N (no. ha⁻¹)	40	622 ± 402	0	1,879	39	859 ± 873	0	4,076	40	651 ± 460	0	2,038
G (m² ha⁻¹)	40	15.3 ± 10.8	0	35.7	39	13.8 ± 9.3	0	38.4	40	10.0 ± 6.2	0	27.1
Sample tree variables
bd (cm)	40	26.9 ± 18.1	1.7	83.6	39	23.5 ± 15.0	3.9	57.0	40	21.2 ± 13.0	1.9	42.9
dbh (cm)	40	22.7 ± 15.6	1.1	70.5	39	18.2 ± 13.4	1.1	47.5	40	19.2 ± 12.3	1.4	41.5
ht (m)	40	12.6 ± 6.3	3.1	30.6	39	11.8 ± 8.3	3.1	28.1	40	10.2 ± 6.9	0.8	32.2
bht (m)	40	6.2 ± 4.7	0.8	20.0	39	5.9 ± 6.2	0.6	22.2	40	4.5 ± 3.3	0.2	12.5
crd (m)	40	6.0 ± 4.2	0.7	18.8	39	3.9 ± 2.7	0.3	10.1	40	4.5 ± 3.1	0.5	12.1
crl (m)	40	6.5 ± 2.9	1.2	15.1	39	6.0 ± 3.1	0.9	13.0	40	5.8 ± 4.3	0.6	21.6
Sample tree biomass data^b
LeafB (kg tree⁻¹)	22	37.5 ± 24.5	6.4	88.8	12	22.8 ± 19.3	3.2	71.9	21	32.8 ± 21.8	5.2	90.0
TwigB (kg tree⁻¹)	22	100.7 ± 63.7	15.7	261.3	12	55.7 ± 59.1	5.0	246.9	21	86.8 ± 60.0	14.3	251.3
BranchB (kg tree⁻¹)	22	204.0 ± 246.8	2.2	1,160.2	12	95.0 ± 67.5	5.4	232.2	21	191.0 ± 214.2	3.7	814.3
StemB (kg tree⁻¹)	22	404.8 ± 359.3	73.7	1,418.5	12	402.2 ± 326.2	22.9	1,081.6	21	310.8 ± 166.2	30.6	564.3
AGB (kg tree⁻¹)	40	447.0 ± 579.9	0.5	2,766.0	39	263.0 ± 343.2	0.6	1,202.4	40	335.9 ± 406.5	90.0	1,524.0
BGB (kg tree⁻¹)	10	100.5 ± 93.7	2.1	245.9	10	273.2 ± 346.7	2.9	851.7	10	232.4 ± 168.0	1.1	569.7

N number of trees, G basal area, bd basal diameter, dbh diameter at breast height, ht total tree height, bht bole height, crd crown diameter, crl crown length, LeafB leaf biomass, TwigB twig biomass, BranchB branch biomass, StemB stem biomass, AGB total aboveground biomass, BGB total belowground biomass
^aThe statistical summary for plot variables include only trees with dbh > 5 cm
^bSince only tree with dbh > 15 cm were partitioned into different aboveground tree components, the sample (n) is less than the expected 40 for each of the three species

ISSN: 1297-966X