Allometry and biomass distribution in replanted mangrove plantations at Gazi Bay, Kenya.

1. This study reports above-ground biomass of 5 and 8 years old mangrove plantations in Kenya. Trees with stem diameter greater than 5.0 cm inside 100 m 2 sample plots were harvested, and then separated into stems (trunks), branches, leaves and prop roots. 2. Mean above-ground biomass was calculated at 20.25 t dry matter ha -1 for Rhizophora mucronata Lam., 11.7 t dry matter ha -1 for Avicennia marina (Forsk.) Vierh., 6.7 t dry matter ha -1 for Sonneratia alba Sm. and 3.7 t dry matter ha -1 for Ceriops tagal (Perr.) C. B. Robinson. In A. marina and R. mucronata, stems (52.19%) and prop-roots (30.28%), respectively, accounted for the highest proportion of the above-ground dry weight. While in S. alba and C. tagal, branch biomass represented the highest percentage of biomass, 48.20% and 43.62%, respectively. 3. The total above-ground biomass of R. mucronata was best estimated from regression equations using a combination of height and diameter above stilt root as the independent variables. For A. marina, C. tagal and S. alba there was no simple correlation found between the above-ground biomass and tree height or stem diameter. 4. Comparison of the regression models with those developed elsewhere gave different biomass values in these plots, further reinforcing the need for the use of site-specific allometric equations for biomass estimation.

[1]  W. Gong,et al.  Allometry and partitioning of the mangrove, Rhizophora apiculata , 2004 .

[2]  A. Komiyama,et al.  Allometry, biomass, and productivity of mangrove forests: A review , 2008 .

[3]  J. Kairo,et al.  Allometric Equations for Estimating Above Ground Biomass of Rhizophora mucronata Lamk. (Rhizophoraceae) Mangroves at Gaxi Bay, Kenya , 2007 .

[4]  C. Woodroffe.  Studies of a mangrove basin, tuff crater, New Zealand. I: Mangrove biomass and production of detritus , 1985 .

[5]  B. Clough,et al.  Allometric relationships for estimating above-ground biomass in six mangrove species , 1989 .

[6]  N. Koedam,et al.  Utilization of mangrove wood products around mida creek (Kenya) amongst subsistence and commercial users , 2000, Economic Botany.

[7]  Francis E. Putz,et al.  Tree growth, dynamics and productivity in a mature mangrove forest in Malaysia , 1986 .

[8]  Peter Saenger,et al.  Mangrove Ecology, Silviculture and Conservation , 2002, Springer Netherlands.

[9]  H. Beeckman,et al.  The mangovre vegetation of Gazi Bay (Kenya) , 1989 .

[10]  V. Chong,et al.  Sediment accumulation and organic material flux in a managed mangrove ecosystem: estimates of land–ocean–atmosphere exchange in peninsular Malaysia , 2004 .

[11]  N. Koedam,et al.  Restoration and management of mangrove systems – A lesson for and from the East African region , 2001 .

[12]  N. Koedam,et al.  Spatial variations in macrobenthic fauna recolonisation in a tropical mangrove bay , 2004, Biodiversity & Conservation.

[13]  J. Kokwaro.  The Distribution and Economic Importance of Mangrove Forests in Kenya , 1985 .

[14]  N. Koedam,et al.  Colonization of non-planted mangrove species into restored mangrove stands in Gazi Bay, Kenya , 2003 .

[15]  F. Dahdouh-Guebas,et al.  Structural development and productivity of replanted mangrove plantations in Kenya , 2008 .

[16]  N. Koedam,et al.  Success rates of recruited tree species and their contribution to the structural development of reforested mangrove stands , 2006 .

[17]  B. Christensen.  Biomass and primary production of Rhizophora apiculata Bl. in a mangrove in southern Thailand , 1978 .

[18]  E. Suzuki,et al.  Biomass of a mangrove forest and a sedge marsh on Ishigaki Island, South Japan , 1983 .

[19]  K. Boto,et al.  Variations in mangrove forest productivity in northern Australia and Papua New Guinea , 1984 .

[20]  M. Amarasinghe,et al.  Net primary productivity of two mangrove forest stands on the northwestern coast of Sri Lanka , 1992 .

[21]  Ariel E. Lugo,et al.  Biomass Estimation Methods for Tropical Forests with Applications to Forest Inventory Data , 1989, Forest Science.

[22]  Robert H. Whittaker,et al.  Methods of Assessing Terrestrial Productivty , 1975 .