Planting birch trees to establish local seed banks [Iceland]
- Creation:
- Update:
- Compiler: Thorunn Petursdottir
- Editor: –
- Reviewers: Jan Reichert, Hanspeter Liniger
technologies_1672 - Iceland
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Expand all Collapse all1. General information
1.2 Contact details of resource persons and institutions involved in the assessment and documentation of the Technology
Key resource person(s)
SLM specialist:
1.3 Conditions regarding the use of data documented through WOCAT
The compiler and key resource person(s) accept the conditions regarding the use of data documented through WOCAT:
Yes
2. Description of the SLM Technology
2.1 Short description of the Technology
Definition of the Technology:
The technology is supposed to increase afforestation with native species within the area by supporting natural seed dispersal
2.2 Detailed description of the Technology
Description:
Areas to be replanted are pre-selected based on local conditions and optimal rates of potential seed dispersal (prevailing dry-wind direction, distance to remnant seed banks etc.). The areas are partially vegetated or have previously been treated with fertilizer (and seed) to facilitate surface stabilization, improved soil qualities and vegetation succession. Only native species are planted in these seed bank "islands": mainly birch and a mixture of willow species. The islands/patches are scattered within the restoration area in order to maximise the effectiveness of the technology in the long term.
Purpose of the Technology: The purpose of the technology is to halt further land degradation and facilitate natural succession within the area undergoing restoration. In the long-term, it should substantially reduce wind and water erosion. It should also lead to increased biodiversity, enhanced water availability and accelerated carbon sequestration (in soil and vegetation). The overall restoration task is to increase the resilience of the ecosystems against natural hazards, such as volcanic activity.
Establishment / maintenance activities and inputs: For the first years, the plants in the seed banks islands are treated annually with a small amount of fertilizer. The nutrient level within the areas is still very low and barely enough to support adequate annual plant growth.
Natural / human environment: In the long-term, the technology is expected to substantially increase biomass production, re-build soil qualities, accelerate carbon sequestration and secure water availability within the rangeland and the adjacent ecosystems. Increased tree and diverse vegetation cover will have the effect of reducing and even halting the sand drift that still creates challenges for inhabitants in adjacent villages, on farmsteads and within the summerhouse clusters, scattered around the area. As the degraded rangeland is in the vicinity of an active volcano (Mt Hekla) the technology is also expected to increase ecosystem resilience against natural hazards like ash and pumice drift and reduce potential offsite damage caused by these materials. Planting areas are pre-selected based on local conditions and optimal rate of potential seed dispersal (prevailing dry-wind direction, distance to remnant seed banks etc.). The areas are partially vegetated or have previously been treated with fertilizer (and seed) to facilitate surface stabilization, improved soil qualities and vegetation succession. Only native species are planted in these seed bank "islands"; mainly birch and a mixture of willow species. The islands/patches are scattered within the restoration area in order to maximise the effectiveness of the technology in the long-term.
2.3 Photos of the Technology
2.5 Country/ region/ locations where the Technology has been applied and which are covered by this assessment
Country:
Iceland
Region/ State/ Province:
Rangarthing Ytra
Further specification of location:
Rangarvellir
Comments:
Total area covered by the SLM Technology is 900 km2.
Map
×2.6 Date of implementation
If precise year is not known, indicate approximate date:
- 10-50 years ago
2.7 Introduction of the Technology
Specify how the Technology was introduced:
- during experiments/ research
3. Classification of the SLM Technology
3.1 Main purpose(s) of the Technology
- reduce, prevent, restore land degradation
- conserve ecosystem
- preserve/ improve biodiversity
- reduce risk of disasters
3.2 Current land use type(s) where the Technology is applied
Forest/ woodlands
Products and services:
- Nature conservation/ protection
- Recreation/ tourism
- Protection against natural hazards
Unproductive land
Specify:
Wastelands, deserts, glaciers, swamps, recreation areas, etc
Comments:
Major land use problems (compiler’s opinion): Vast parts of the area are heavily degraded due to unsustainable land use through the centuries in combination to harsh climate and frequent volcanic eruptions. The major land use problem are related to the fact that the concerned ecosystems collapsed long time ago and despite all restoration efforts implemented within the area for over 100 years, the systems are still highly dysfunctional. Their carrying capacity is limited and even light livestock grazing can keep further vegetation succession down. Passive restoration might take place where the livestock grazing has been excluded but in most cases some technologies are needed to "kickstart" the ecosystem and break their negative resilience against changes.
Major land use problems (land users’ perception): They are fully aware that the ecosystems are in a poor condition and restoration is needed in order to push improvements forward. They acknowledge that grazing of collapsed ecosystems can maintain the dysfunctional of the systems and hinder ecological improvements. Nevertheless, in many cases they believe the harsh climate and volcanic activities are the main contributors to land degradation - that livestock grazing and the grazing carrying capacity of the rangeland are not fundamental issues in this context.
Future (final) land use (after implementation of SLM Technology): Forests / woodlands: Fn: Natural
Constraints of wastelands / deserts / glaciers / swamps
Number of growing seasons per year: 1
Longest growing period from month to month: June to end August
3.3 Has land use changed due to the implementation of the Technology?
Has land use changed due to the implementation of the Technology?
- Yes (Please fill out the questions below with regard to the land use before implementation of the Technology)
Unproductive land
Specify:
Wastelands, deserts, glaciers, swamps, recreation areas, etc
3.4 Water supply
Water supply for the land on which the Technology is applied:
- rainfed
3.5 SLM group to which the Technology belongs
- improved ground/ vegetation cover
- ecosystem-based disaster risk reduction
3.6 SLM measures comprising the Technology
vegetative measures
- V1: Tree and shrub cover
management measures
- M1: Change of land use type
Comments:
Main measures: vegetative measures, management measures
Type of vegetative measures: aligned: -against wind, scattered / dispersed
3.7 Main types of land degradation addressed by the Technology
biological degradation
- Bc: reduction of vegetation cover
- Bq: quantity/ biomass decline
- Bs: quality and species composition/ diversity decline
water degradation
- Hs: change in quantity of surface water
- Hg: change in groundwater/aquifer level
Comments:
Secondary types of degradation addressed: Bc: reduction of vegetation cover, Bq: quantity / biomass decline, Bs: quality and species composition /diversity decline, Hs: change in quantity of surface water, Hg: change in groundwater / aquifer level
Main causes of degradation: deforestation / removal of natural vegetation (incl. forest fires), over-exploitation of vegetation for domestic use, overgrazing, Heavy / extreme rainfall (intensity/amounts), wind storms / dust storms, other natural causes (avalanches, volcanic eruptions, mud flows, highly susceptible natural resources, extreme topography, etc.) specify
Secondary causes of degradation: disturbance of water cycle (infiltration / runoff), change in temperature, floods, land tenure, governance / institutional
3.8 Prevention, reduction, or restoration of land degradation
Specify the goal of the Technology with regard to land degradation:
- reduce land degradation
- restore/ rehabilitate severely degraded land
Comments:
Main goals: mitigation / reduction of land degradation, rehabilitation / reclamation of denuded land
Secondary goals: prevention of land degradation
4. Technical specifications, implementation activities, inputs, and costs
4.1 Technical drawing of the Technology
Technical specifications (related to technical drawing):
An example showing the development of a local seed bank at a previously eroded area.
Location: South Iceland
Technical knowledge required for field staff / advisors: high
Technical knowledge required for land users: moderate
Main technical functions: improvement of ground cover, increase of surface roughness, improvement of topsoil structure (compaction), increase in organic matter, increase in nutrient availability (supply, recycling,…), increase of infiltration, increase / maintain water stored in soil, increase of groundwater level / recharge of groundwater, water harvesting / increase water supply, water spreading, improvement of water quality, buffering / filtering water, sediment retention / trapping, sediment harvesting, reduction in wind speed, increase of biomass (quantity)
Secondary technical functions: control of raindrop splash, control of dispersed runoff: retain / trap, control of dispersed runoff: impede / retard, control of concentrated runoff: impede / retard, control of concentrated runoff: drain / divert, stabilisation of soil (eg by tree roots against land slides), promotion of vegetation species and varieties (quality, eg palatable fodder), spatial arrangement and diversification of land use
Aligned: -against wind
Vegetative material: T : trees / shrubs
Scattered / dispersed
Vegetative material: T : trees / shrubs
Trees/ shrubs species: birch and several willow species planted to facilitate natural regeneration of native trees and shrubs
Change of land use type: Protected from sheep grazing
Author:
Áskell Þórisson
4.2 General information regarding the calculation of inputs and costs
other/ national currency (specify):
ISK
If relevant, indicate exchange rate from USD to local currency (e.g. 1 USD = 79.9 Brazilian Real): 1 USD =:
138.0
4.3 Establishment activities
Activity | Timing (season) | |
---|---|---|
1. | Planting seedlings | May/June |
4.4 Costs and inputs needed for establishment
Specify input | Unit | Quantity | Costs per Unit | Total costs per input | % of costs borne by land users | |
---|---|---|---|---|---|---|
Labour | Planting | |||||
Equipment | Machinery | |||||
Plant material | Seedlings | |||||
Other | Total costs | ha | 1.0 | 500000.0 | 500000.0 | |
Total costs for establishment of the Technology | 500000.0 | |||||
Total costs for establishment of the Technology in USD | 3623.19 |
4.7 Most important factors affecting the costs
Describe the most determinate factors affecting the costs:
The most determinate factors affecting the cost are a) the distance from the farmsteads to the eroded areas and b) the time it takes to plant the seedlings; easily accessible areas vs difficult areas
5. Natural and human environment
5.1 Climate
Annual rainfall
- < 250 mm
- 251-500 mm
- 501-750 mm
- 751-1,000 mm
- 1,001-1,500 mm
- 1,501-2,000 mm
- 2,001-3,000 mm
- 3,001-4,000 mm
- > 4,000 mm
Agro-climatic zone
- sub-humid
- semi-arid
Thermal climate class: boreal
Thermal climate class: polar/arctic
5.2 Topography
Slopes on average:
- flat (0-2%)
- gentle (3-5%)
- moderate (6-10%)
- rolling (11-15%)
- hilly (16-30%)
- steep (31-60%)
- very steep (>60%)
Landforms:
- plateau/plains
- ridges
- mountain slopes
- hill slopes
- footslopes
- valley floors
Altitudinal zone:
- 0-100 m a.s.l.
- 101-500 m a.s.l.
- 501-1,000 m a.s.l.
- 1,001-1,500 m a.s.l.
- 1,501-2,000 m a.s.l.
- 2,001-2,500 m a.s.l.
- 2,501-3,000 m a.s.l.
- 3,001-4,000 m a.s.l.
- > 4,000 m a.s.l.
Indicate if the Technology is specifically applied in:
- not relevant
5.3 Soils
Soil depth on average:
- very shallow (0-20 cm)
- shallow (21-50 cm)
- moderately deep (51-80 cm)
- deep (81-120 cm)
- very deep (> 120 cm)
Soil texture (topsoil):
- coarse/ light (sandy)
Soil texture (> 20 cm below surface):
- coarse/ light (sandy)
Topsoil organic matter:
- medium (1-3%)
- low (<1%)
If available, attach full soil description or specify the available information, e.g. soil type, soil PH/ acidity, Cation Exchange Capacity, nitrogen, salinity etc.
Soil fertility is very low-low to medium
Soil drainage/infiltration is poor to medium
Soil water sotrage capacity is very low to medium
5.4 Water availability and quality
Ground water table:
< 5 m
Availability of surface water:
poor/ none
Water quality (untreated):
good drinking water
Water quality refers to:
ground water
Is water salinity a problem?
No
Is flooding of the area occurring?
No
5.5 Biodiversity
Species diversity:
- low
Habitat diversity:
- low
5.6 Characteristics of land users applying the Technology
Sedentary or nomadic:
- Sedentary
Market orientation of production system:
- subsistence (self-supply)
Off-farm income:
- 10-50% of all income
Relative level of wealth:
- rich
Individuals or groups:
- groups/ community
Level of mechanization:
- manual work
- mechanized/ motorized
Gender:
- women
- men
Age of land users:
- middle-aged
Indicate other relevant characteristics of the land users:
Land users applying the Technology are mainly common / average land users
Population density: < 10 persons/km2
5.7 Average area of land used by land users applying the Technology
- < 0.5 ha
- 0.5-1 ha
- 1-2 ha
- 2-5 ha
- 5-15 ha
- 15-50 ha
- 50-100 ha
- 100-500 ha
- 500-1,000 ha
- 1,000-10,000 ha
- > 10,000 ha
Is this considered small-, medium- or large-scale (referring to local context)?
- small-scale
5.8 Land ownership, land use rights, and water use rights
Land ownership:
- state
Land use rights:
- communal (organized)
Water use rights:
- open access (unorganized)
Are land use rights based on a traditional legal system?
Yes
5.9 Access to services and infrastructure
health:
- poor
- moderate
- good
education:
- poor
- moderate
- good
technical assistance:
- poor
- moderate
- good
employment (e.g. off-farm):
- poor
- moderate
- good
markets:
- poor
- moderate
- good
energy:
- poor
- moderate
- good
roads and transport:
- poor
- moderate
- good
drinking water and sanitation:
- poor
- moderate
- good
financial services:
- poor
- moderate
- good
6. Impacts and concluding statements
6.1 On-site impacts the Technology has shown
Socio-economic impacts
Water availability and quality
drinking water availability
water availability for livestock
water quality for livestock
Other socio-economic impacts
Land price/lease
Socio-cultural impacts
cultural opportunities
recreational opportunities
community institutions
national institutions
SLM/ land degradation knowledge
Ecological impacts
Water cycle/ runoff
water quantity
water quality
harvesting/ collection of water
surface runoff
excess water drainage
groundwater table/ aquifer
evaporation
Soil
soil moisture
soil cover
soil loss
nutrient cycling/ recharge
soil organic matter/ below ground C
Biodiversity: vegetation, animals
biomass/ above ground C
plant diversity
animal diversity
habitat diversity
Climate and disaster risk reduction
emission of carbon and greenhouse gases
wind velocity
6.2 Off-site impacts the Technology has shown
water availability
downstream flooding
downstream siltation
buffering/ filtering capacity
wind transported sediments
damage on neighbours' fields
damage on public/ private infrastructure
6.3 Exposure and sensitivity of the Technology to gradual climate change and climate-related extremes/ disasters (as perceived by land users)
Gradual climate change
Gradual climate change
Season | increase or decrease | How does the Technology cope with it? | |
---|---|---|---|
annual temperature | increase | well |
Climate-related extremes (disasters)
Meteorological disasters
How does the Technology cope with it? | |
---|---|
local windstorm | well |
Climatological disasters
How does the Technology cope with it? | |
---|---|
drought | not well |
Hydrological disasters
How does the Technology cope with it? | |
---|---|
general (river) flood | well |
Other climate-related consequences
Other climate-related consequences
How does the Technology cope with it? | |
---|---|
reduced growing period | well |
6.4 Cost-benefit analysis
How do the benefits compare with the establishment costs (from land users’ perspective)?
Short-term returns:
positive
Long-term returns:
very positive
How do the benefits compare with the maintenance/ recurrent costs (from land users' perspective)?
Short-term returns:
very positive
Long-term returns:
very positive
6.5 Adoption of the Technology
- 11-50%
Of all those who have adopted the Technology, how many did so spontaneously, i.e. without receiving any material incentives/ payments?
- 0-10%
6.6 Adaptation
Has the Technology been modified recently to adapt to changing conditions?
Yes
other (specify):
climate
Specify adaptation of the Technology (design, material/ species, etc.):
using of local birch trees
freezing the seadlings (after planting the plants have some water to grow and they can't lose water through evaporation, start growing when the conditions are good for them) --> much better succes
6.7 Strengths/ advantages/ opportunities of the Technology
Strengths/ advantages/ opportunities in the land user’s view |
---|
Trees are less vulnerable to ash falls after volcanic eruptions. |
The astetic view of landscape is increasing. |
The trees can store carbon. |
Strengths/ advantages/ opportunities in the compiler’s or other key resource person’s view |
---|
Trees are less vulnerable to ash falls after volcanic eruptions. |
The astetic view of landscape is increasing. |
Native Icelandic plants are used. |
The trees can store carbon. |
6.8 Weaknesses/ disadvantages/ risks of the Technology and ways of overcoming them
Weaknesses/ disadvantages/ risks in the land user’s view | How can they be overcome? |
---|---|
It covers land who could be used for other things (grazing). | Explain advantages of restore land and save it from wind erosion |
Weaknesses/ disadvantages/ risks in the compiler’s or other key resource person’s view | How can they be overcome? |
---|---|
The soil in certain locations must first be prepared. | Through land reclamation activities the soil can be improved. (fertilized and stabilized) |
7. References and links
7.1 Methods/ sources of information
- field visits, field surveys
- interviews with land users
- interviews with SLM specialists/ experts
- compilation from reports and other existing documentation
7.3 Links to relevant online information
Title/ description:
Webpage Soil Conservation Service of Iceland
URL:
https://land.is/english/
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