Restoration of former grazing lands in the highlands of Laos using direct seeding of four native tree species: Seedling establishment and growth performance
Direct seeding has recently regained favor as a lower-cost alternative to planting seedlings for restoration of degraded or abandoned sites. This study reports the establishment and growth performance of 2 pioneer (Pinus kesiya and Schima wallichii) and 2 later-successional (Keteleeria everlyniana and Quercus serrata) native trees broadcasted or buried on former grazing lands in Laos.
Research goals & methods
14 plots were established on former pasture sites in Laos. Seedling establishment was assessed 9 months after sowing and again after 1, 3, and 5 years. significant interspecies and intersite variations were detected for height, diameter growth, and survival. Establishment success was better for buried seeds of Q serrata (49-65%) and K evelyniana (20-59%) than for broadcasted seeds of P kesiya (13-50%), S wallichii (3-34%) and K evelyniana (6-22%). Intersite variation may be related to topographical microhabitat conditions. The two pioneer species achieved better diameter and height growth than the later-successional species.
Conclusions & takeaways
The authors suggest that direct seeding with buried seeds may be a viable option for rehabilitation of abandoned sites, provided that species are chosen based on topographical and other site variations. The authors recommend a reduced seeding rate of pioneer species compared to average planting stockings.
Restoration of Former Grazing Lands in the Highlands of Laos Using Direct Seeding of Four Native Tree Species. Mountain Research and Development. 2010;30:232–243. doi:10.1659/mrd-journal-d-10-00031.1..
- Southern Swedish Forest Research Centre, Faculty of Forest Sciences, Swedish University of Agricultural Sciences, Alnarp, Sweden
- Faculty of Forestry, National University of Laos, Lao PDR
- Département Productions Forestières, Institut de l'Environnement et de Recherches Agricoles, Ouagadougou, Burkina Faso