Tree planting to restore degraded peat swamp forest in Thailand
This study is summarised as evidence for the following.
Directly plant peatland trees/shrubsAction Link
Create mounds or hollows (before planting)Action Link
Directly plant peatland trees/shrubs
A study in 1988–1997 in a degraded peat swamp in Thailand (Nuyim 2000) reported that 22–97% of planted trees survived for four years or more, and that surviving trees grew. No statistical tests were carried out. For 22 of 28 planted species, at least 50% of planted trees survived for at least four years. Survival was highest for milkwood Alstonia spathulata and Ixora grandifolia (97% after four years) and lowest for Dacryodes sp. (22% after four years). For 13 species, survival rates over nine years were also reported and were similar to those after five and half years (within 2%). For 15 species, growth rates were reported. These species all grew, from 35–120 cm tall one year after planting to 110–340 cm tall four years after planting. Trees (number not reported) were planted into the degraded peat swamp in 1988 (13 species) or 1993 (15 species). Survival and height were recorded up to nine years after planting.
Create mounds or hollows (before planting)
A controlled study in a degraded peat swamp in Thailand (Nuyim 2000) reported that five tree species grew thicker stems when planted into mounds than when planted at ground level. The results were not tested for statistical significance. After three years and for all five planted species, trees planted into mounds had developed thicker stems (3–6 cm) than trees planted at ground level (2–3 cm). Mounds had a particularly strong effect on Syzygium pyrifolium stem thickness (mounded: 6 cm; ground level: 3 cm). In a degraded peat swamp, trees were either planted into mounds of peat (50 cm high, 70–90 cm circumference) or at ground level. After three years, the diameter of all trees was measured 10 cm above the peat surface. The year, number of trees and their initial size were not reported.