Alnus acuminata


  • Category: Species
  • Author: Fabrice Feyton
  • Published: April 14, 2020
  • Views: 69

Popular known for highest amount of seeds per kilograms estimated to 1,400,000- 2,000,000 seeds/kg, Alnus acuminata is a fast growing pioneer species that regenerates naturally in open, disturbed areas.

alnus acuminata seeds

Alnus acuminata seeds

Grows in moist soil environments, usually along the banks of streams, rivers, ponds and swamps, where it typically forms dense, pure stands; can also be associated with floodplains or moist mountain slopes, and it may be adapted to somewhat drier conditions. However, it is usually restricted to zones with extra soil moisture such as cool, tropical highlands, and cool, high-latitude regions with abundant rainfall.

Alnus acuminata potential

  • It grows well on slopes and it’s roots are lateral and extended rather than deep and confined.
  • It has rapid growth rate in degraded soil
  • It grows fast in good rainfall range regions.
  • It grows on sloping topography
  • It has fast growth rate, attains larger size and is tolerant to drier sites because of its nitrogen-fixing capacity.

Biophysical limits

Altitude: 1,000-3,000 meters
Soils: free draining, moist soils
Mean annual temperature: 12-20 degree Celsius
Mean annual rainfall: 1,000-3,000 mm

Management

Alnus acuminata seeds are recalcitrant. With 80% germination rate which reduce over time depending on storage of seeds. There is no treatments before sowing, advised to mix seeds with sand due to small size of Alnus acuminata seeds.

Nursery management

Alnus acuminata is susceptible to attacks by defoliators like Nodonota spp, stem bolers like Scolytoes alni, with it’s seeds being susceptible to damages caused by fungi like Fusarium sp.

Make weeding a continuous activity rather than periodic to prevent disease outbreak. Keep the potting mix moist but not wet to avoid water lodging with watering intensity of twice a day with a very fine mist to maintain soil moisture.

Tree management

To ensure fast early growing, weeds must be kept as minimum as possible. There are many activities to be carried out to ensure success of Alnus acuminata plantation

  • Cleaning: primary purpose is control of stand composition by removal of underible individuals of a comparable age such as harmful climbers and wolf trees.
  • Prunning: it usually entails removal of diseased, damaged, dead, non-productive, or otherwise unwated tissue from the tree such as branches an twigs.
  • Thinning: at least two thinnings are recommended; the first after the third year an the second after 10 to 15 years

Regeneration treatments

These treatments combine both harvesting and re-establishment of the stand. A. acuminata regenerates naturally in open, disturbed areas. Alnus acuminata trees are harvested at the age of 20 years.

Productivity and usages

Alnus acuminata have an average annual wood production of 15 to 20 meter cubes per hectare. With wide range of potential uses, Alnus acuminata is either used as a product or for serving other services

Products

  • Fodder: The palatable, nitrogen-rich leaves make a useful source of emergency fodder for grazing animals
  • Fuel: reputed to be good for firewood, the calorific value is estimated to be around 250 kj/kg. It has good even burning characteristics
  • Timber: it is a source of good timber as it dries easily and preserves well.
  • Medicinal applications: Leaves of Alnus acuminata can be used in treatment of joint and muscular pains, rheumatism and skin conditions.

Services

  • Reclamation: Useful for reforestation, soil reclamation on slopes and reclamation of unstable soils, as it grows well on slopes and the roots are lateral and extended rather than deep and confined
  • Nitrogen fixation: even though Alnus acuminata is not a legume, the species have the ability to fix nitrogen due to the symbiotic relationship with Actinomyces alni, which enables the tree to fix atmospheric nitrogen in quantities sufficient enough for the development of the plant.
  • Soil improvement: among other positive effects of Alnus acuminata are the supply of organic matter and the control of soil moisture due to its shade
  • Apiculture

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