Growth performance of planted mangroves in the Philippines: revisiting forest management strategies
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Published source details
Samson M.S. & Rollon R.N. (2008) Growth performance of planted mangroves in the Philippines: revisiting forest management strategies. Ambio, 37, 234-240.
Published source details Samson M.S. & Rollon R.N. (2008) Growth performance of planted mangroves in the Philippines: revisiting forest management strategies. Ambio, 37, 234-240.
Actions
This study is summarised as evidence for the following.
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Introduce tree/shrub seeds or propagules: brackish/saline wetlands Action Link |
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Introduce tree/shrub seeds or propagules: brackish/saline wetlands Action Link |
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Directly plant trees/shrubs: brackish/saline wetlands Action Link |
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Directly plant trees/shrubs: brackish/saline wetlands Action Link |
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Introduce tree/shrub seeds or propagules: brackish/saline wetlands
A study of mangrove planting projects in the Philippines (Samson & Rollon 2008) reported <5% survival of planted mangrove propagules/seedlings, but growth of surviving seedlings. Plantings almost exclusively involved Rhizophora spp. In two sites where survival was quantified, <5% of planted individuals survived (over nine months in one site; timescale not reported for other site). The study suggests that seedlings were killed by mechanical stress, substrate erosion, and oysters growing on their stems. Growth of surviving seedlings was quantified in eight sites. “Young individuals” grew by 3–13 cm over approximately 40 days (equivalent to 30–75 cm/year). Growth rates significantly differed between elevations: lowest in the low intertidal zone, and highest in the upper intertidal zone. Methods: The study reported results from various mangrove planting projects initiated since the 1980s: both afforestation (planting in mudflats, sandflats or seagrass beds) and reforestation (re-planting cleared mangroves, mostly fishponds). Propagules and/or seedlings were generally planted 1 m apart, following national guidelines, but often with 2–5 individuals at each planting spot.
(Summarised by: Nigel Taylor)
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Introduce tree/shrub seeds or propagules: brackish/saline wetlands
A replicated, paired, site comparison study of six coastal sites in the Philippines (Samson & Rollon 2008) reported that planted mangrove forests typically contained a higher density of trees and greater canopy cover than natural mangrove forests. Statistical significance was not assessed. After “several years”, planted forests contained a greater density of trees than natural forests in 9 of 10 comparisons (for which planted: 27–93 trees/100 m2; natural: 22–42 trees/100 m2). Planted forests had greater canopy cover than natural forests in 5 of 9 comparisons (data reported as a canopy index; other comparisons lower in planted forests). Methods: The study surveyed planted and natural mangrove forests at six sites (1–22 plots/forest type/site; dates not reported). Plantings had taken place since the 1980s (precise dates not reported) and almost exclusively involved Rhizophora spp. propagules and/or seedlings. These were generally planted 1 m apart, following national guidelines, but often with 2–5 individuals at each planting spot. Some plantings involved afforestation (planting in mudflats, sandflats or seagrass beds) and some involved reforestation (re-planting cleared mangroves, mostly fishponds).
(Summarised by: Nigel Taylor)
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Directly plant trees/shrubs: brackish/saline wetlands
A study of mangrove planting projects in the Philippines (Samson & Rollon 2008) reported <5% survival of planted mangrove seedlings/propagules, but growth of surviving seedlings. Plantings almost exclusively involved Rhizophora spp. In two sites where survival was quantified, <5% of planted individuals survived (over nine months in one site; timescale not reported for other site). The study suggests that seedlings were killed by mechanical stress, substrate erosion, and oysters growing on their stems. Growth of surviving seedlings was quantified in eight sites. “Young individuals” grew by 3–13 cm over approximately 40 days (equivalent to 30–75 cm/year). Growth rates significantly differed between elevations: lowest in the low intertidal zone, and highest in the upper intertidal zone. Methods: The study reported results from various mangrove planting projects initiated since the 1980s: both afforestation (planting in mudflats, sandflats or seagrass beds) and reforestation (re-planting cleared mangroves, mostly fishponds). Seedlings and/or propagules were generally planted 1 m apart, following national guidelines, but often with 2–5 individuals at each planting spot.
(Summarised by: Nigel Taylor)
-
Directly plant trees/shrubs: brackish/saline wetlands
A replicated, paired, site comparison study of six coastal sites in the Philippines (Samson & Rollon 2008) reported that planted mangrove forests typically contained a higher density of trees and greater canopy cover than natural mangrove forests. Statistical significance was not assessed. After “several years”, planted forests contained a greater density of trees than natural forests in 9 of 10 comparisons (for which planted: 27–93 trees/100 m2; natural: 22–42 trees/100 m2). Planted forests had greater canopy cover than natural forests in 5 of 9 comparisons (data reported as a canopy index; other comparisons lower in planted forests). Methods: The study surveyed planted and natural mangrove forests at six sites (1–22 plots/forest type/site; dates not reported). Plantings had taken place since the 1980s (precise dates not reported) and almost exclusively involved Rhizophora spp. seedlings and/or propagules. These were generally planted 1 m apart, following national guidelines, but often with 2–5 individuals at each planting spot. Some plantings involved afforestation (planting in mudflats, sandflats or seagrass beds) and some involved reforestation (re-planting cleared mangroves, mostly fishponds).
(Summarised by: Nigel Taylor)
