The term afforestation means establishing new forest on lands that were not forest before (e.g. abandoned agriculture). The same definition in other words states that afforestation is "conversion to forest of land that historically has not contained forests".: 1794
The process of afforestation begins with site selection. Several environmental factors of the site must be analyzed, including climate, soil, vegetation, and human activity. These factors will determine the quality of the site, what species of trees should be planted, and what planting method should be used.
After the forest site has been assessed, the area must be prepared for planting. Preparation can involve a variety of mechanical or chemical methods, such as chopping, mounding, bedding, herbicides, and prescribed burning. Once the site is prepared, planting can take place. One method for planting is direct seeding, which involves sowing seeds directly into the forest floor. Another is seedling planting, which is similar to direct seeding except that seedlings already have an established root system. Afforestation by cutting is an option for tree species that can reproduce asexually, where a piece of a tree stem, branch, root, or leaves can be planted onto the forest floor and sprout successfully. Sometimes special tools, such as a tree planting bar, are used to make planting of trees easier and faster.
An essential aspect of successful afforestation efforts lies in the careful selection of tree species that are well-suited to the local climate and soil conditions. By choosing appropriate species, afforested areas can better withstand the impacts of climate change.
Afforestation projects create employment opportunities, particularly in rural areas, thus promoting sustainable livelihoods. They can create many jobs in various forest-related activities.
An important consideration in such efforts is that forests can turn from sinks to carbon sources. In 2019 forests took up a third less carbon than they did in the 1990s, due to higher temperatures, droughts and deforestation. National-scale forest inventory data also shows trends from 1999 to 2020 that some forests were already approaching climate thresholds shifting them from carbon sinks to carbon sources. The typical tropical forest may become a carbon source by the 2060s.
Earth offers enough room to plant an additional 0.9 billion ha of tree canopy cover, although this estimate has been criticized, and the true area that has a net cooling effect on the climate when accounting for biophysical feedbacks like albedo is 20-80% lower. Planting and protecting these trees would sequester 205 billion tons of carbon if the trees survive future climate stress to reach maturity. To put this number into perspective, this is about 20 years of current global carbon emissions (as of 2019) . This level of sequestration would represent about 25% of the atmosphere's carbon pool in 2019.
Life expectancy of forests varies throughout the world, influenced by tree species, site conditions, and natural disturbance patterns. In some forests, carbon may be stored for centuries, while in other forests, carbon is released with frequent stand replacing fires. Forests that are harvested prior to stand replacing events allow for the retention of carbon in manufactured forest products such as lumber. However, only a portion of the carbon removed from logged forests ends up as durable goods and buildings. The remainder ends up as sawmill by-products such as pulp, paper, and pallets. If all new construction globally utilized 90% wood products, largely via adoption of mass timber in low rise construction, this could sequester 700 million net tons of carbon per year. This is in addition to the elimination of carbon emissions from the displaced construction material such as steel or concrete, which are carbon-intense to produce.
A meta-analysis found that mixed species plantations would increase carbon storage alongside other benefits of diversifying planted forests.
Although a bamboo forest stores less total carbon than a mature forest of trees, a bamboo plantation sequesters carbon at a much faster rate than a mature forest or a tree plantation. Therefore, the farming of bamboo timber may have significant carbon sequestration potential.
Impacts on temperature are affected by the location of the forest. For example, reforestation in boreal or subarctic regions has less impact on climate. This is because it substitutes a high-albedo, snow-dominated region with a lower-albedo forest canopy. By contrast, tropical reforestation projects lead to a positive change such as the formation of clouds. These clouds then reflect the sunlight, lowering temperatures.: 1457
Planting trees in Afforestation provides other environmental benefits, including increasing the soil quality and its organic carbon levels, reducing the risk of erosion and desertification. The planting of trees in urban areas is also able to reduce air pollution via the trees' absorption and filtration of pollutants, including carbon monoxide, sulfur dioxide, and ozone, in addition to CO2.
Forests act as natural air filters, absorbing pollutants and improving air quality. Urban forestation projects have been successful in reducing respiratory illnesses and enhancing overall air quality in cities. Trees provide shade and cooling effects. By shading and evaporation, forests can lower local temperatures, offering a more comfortable environment in urban areas and reducing the impact of extreme heat.
Tree-planting campaigns are criticised for sometimes targeting areas where forests would not naturally occur, such as grassland and savanna biomes. Carbon sequestration forecasts of afforestation programmes often insufficiently consider possible carbon reductions in soils as well as slowing tree growth over time.
Questions have also been raised in the scientific community regarding how global afforestation could affect the surface albedo of Earth. The canopy cover of mature trees could make the surface albedo darker, which causes more heat to be absorbed, potentially raising the temperature of the planet. This is particularly relevant in parts of the world with high levels of snow cover, due to the more significant difference in albedo between highly reflective white snow and more darker forest cover which absorbs more solar radiation.
One significant criticism of reforestation or afforestation efforts that rely on monocultures of - usually conifer - trees is that, while they may increase tree cover, they fail to provide the diverse and complex habitat needed by most woodland creatures. Monocultures, often planted for commercial purposes or ease of management, lack the biodiversity of natural forests. These single-species forests provide limited food sources, shelter, and nesting sites for a wide range of wildlife, and in purely coniferous forests low levels of light may reach the forest floor reducing habitat and variety of plant life. Many woodland creatures, such as birds, mammals, and insects, rely on a variety of tree species and plant life for survival, and the uniformity of monocultures does not support these varied ecological needs. As a result, such reforestation or afforestation efforts may unintentionally create environments that are unsuitable for the very species they aim to protect, thus undermining broader conservation goals.
China had the highest afforestation rate of any country or region in the world, with 4.77 million hectares (47,000 square kilometers) of afforestation in 2008. According to the 2021 government work report, forest coverage will reach 24 percent based on the main targets and tasks for the 14th Five-Year Plan period.
A law in China from 1981 requires that every school student over the age of 11 plants at least one tree per year.
This contrasts with more recent initiatives where the results have not been as favorable. In an attempt to make afforestation both low-cost and less time-consuming, China shifted towards monoculture of mostly red pine trees. However, this did not adequately take into consideration environmental structure and led to increased soil erosion, desertification, sand/dust storms and short-lived trees. This has reduced China's environmental sustainability index (ESI) to one of the lowest in the world.
Europe deforested more than half of its forested areas over the last 6000 years. The European Union (EU) has paid farmers for afforestation since 1990, offering grants to turn farmland into forest and payments for the management of forest. As part of the Green Deal, the EU program "3 Billion Tree Planting Pledge by 2030" provides direction on afforestation of previous farmland in addition to reforestation.
As of 2023 the total forest and tree cover in India was 22%. The forests of India are grouped into 5 major categories and 16 types based on biophysical criteria. 38% of the forest is categorized as subtropical dry deciduous and 30% as tropical moist deciduous and other smaller groups.
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