Thor Smestad is a Canadian forestry expert of many years experience. He volunteered at REGUA with a brief to try to improve our plant propagation programme. See our first news on Thor’s visit here.
Many Mata Atlantica tree seeds germinate easily and only require to be collected from the forest, placed in a soil-filled sleeves, watered and sheltered from direct sun in the nursery. However, germination rates for some can be poor. For trees from the fig family for example, success may be limited. Perhaps Brazil nuts are the best illustration of this dilemma: fewer than 5% of planted seeds germinate.
The way ahead is to use cuttings of shoots dipped in rooting hormone and placed in soil. In this way, rare plants, not found in fruit, and species with seeds of low viability can be restored to the new forest plantings here at REGUA.
Symbiotic micorrhizal fungi are another issue investigated in Thor’s project. We do not know how central these fungi are to successful forest establishment and vigorous growth. By experimentally including/excluding forest floor debris (which will carry the fungal spores), the impact of micorrhiza may be assessed. Better information improves reafforestation outcomes and so there is understandably a lot of interest in Thor’s work.