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Planting design, survival and blue carbon stock of mangrove plantations in Banacon Island, Philippines

XV World Forestry Congress, 2-6 May 2022

Year of publication 2022

Place of publication Rome, Italy ;

Pages 6p.

Author Gevaña, D. T., Im, S.

Publisher FAO ;

Product type Article

Synopsis (short abstract) Mangrove forests have the capacity to store and sequester vast amount of atmospheric carbon. Coastal reforestation in the tropics became more popular because of this ecosystem service and their value to protect human from the impacts of tsunami and storm surge. To illustrate mangrove’s blue carbon potential in view of planting design, carbon stock assessment of 20-year old Rhizophora stylosa plantations was done. Tree and sediment carbon stocks were determined using standard nested plot technique. These parameters were further examined in terms of the plant spacing used during the plantation establishment, namely: 0.5m x 0.5m; and 1.0m x 1.0m. Key findings showed that plantations that were established with closer spacing i.e. 0.5m x 0.5m spacing have higher stand density values than those with 1.0m x 1.0m interval by about 23,900 trees ha-1. Survival rate was also significantly higher in the former than the latter with a mean difference of 23%. In view of total carbon stocks, 0.5m x 0.5m spaced stands contain 276.8±11.6 tC ha-1, of which sediment has contributed about 110.1 tC ha-1 (40%). On the other hand, stands of 1.0m x 1.0m spacing have only 157.6±40.1 tC ha-1, wherein 21.3 tC ha-1 (48.2%) is attributable to sediments. Overall findings suggested that planting at a closer spacing (0.5m distance) could produce larger sediment carbon stock. A significant mean difference of 88.80 tC ha-1 was computed in favor of 0.5m x 0.5m stand, which is indicative of two possible reasons: a) thicker vegetation provides larger source organic material through litterfall; b) more interlinked roots help stabilize sediment from erosion while effectively trapping more organic material from other sources during tidal movements. ID: 3477110

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    Rubber tree is one of the important commercial commodities in the globe. This study was conducted to examine the change in soil fertility and soil organic carbon stocks following conversion of forest to rubber plantation of different ages (5, 10, 15, 20 and 25 years) and coffee agroforestry. The field experiment was conducted in Guraferda district, Southwest Ethiopia. The soil samples were collected from 20× 20 m 2 plots at 30 cm depth, with three replicates at a 100 m interval. A total of 42 soil samples were taken from the three land-use types. The soil moisture content (MC), porosity, soil pH, organic carbon (OC), total nitrogen (N), available phosphorous (P), exchangeable bases, CEC (cation exchange capacity) and base saturation (B)S content of the NF (natural forest), CA(coffee agroforestry) and old age rubber plantation (RP15, RP20 and RP25) were higher than the early years of rubber plantation (RP5 and RP10). The highest soil organic carbon stocks (SOC) were recorded in NF (114.3 Mg ha -1 ), CA (112.2 Mg ha -1 ), RP25 (98.5 Mg ha -1 ) and RP20 (97.8 Mg ha -1 ). The SOC loss because of conversion of NF to RP5 (11.0 Mg ha -1 y -1), RP10 (5.3 Mg ha -1 y -1 ), RP15 (2.3 Mg ha -1 y -1 ), RP20 (0.8 Mg ha -1 y -1 ), RP25 (0.6 Mg ha -1 y -1 ) and CA (0.1 Mg ha -1 y -1 ). In general, old age rubber plantation (RP20 and RP25) showed proportional levels of soil fertility and soil organic carbon stocks compared with the natural forest and the coffee agroforestry. Since all physico-chemical characteristics were low at the early years of rubber plantation, we recommend to supplement significant proportions of nutrient to the early years of rubber plantation (0-10 years). Keywords: Rubber plantation, Land use types, Physico-chemical characteristics, Soil organic carbon stocks, Organic carbon loss. ID: 3605459
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