Forest cover is the amount of

forest A forest is an area of land dominated by trees. Hundreds of definitions of forest are used throughout the world, incorporating factors such as tree density, tree height, land use, legal standing, and ecological function. The United Nations' ...

that covers a particular area of land. It may be measured as relative (in

percent In mathematics, a percentage (from la, per centum, "by a hundred") is a number or ratio expressed as a fraction (mathematics), fraction of 100. It is often Denotation, denoted using the percent sign, "%", although the abbreviations "pct.", "p ...

) or absolute (in

square kilometre Square kilometre ( International spelling as used by the International Bureau of Weights and Measures) or square kilometer (American spelling), symbol km2, is a multiple of the square metre, the SI unit of area or surface area. 1 km2 is equ ...

square mile The square mile (abbreviated as sq mi and sometimes as mi2)Rowlett, Russ (September 1, 2004) University of North Carolina at Chapel Hill. Retrieved February 22, 2012. is an imperial and US unit of measure for area. One square mile is an ar ...

s). Around a third of the world's surface is covered with forest, with closed-canopy forest accounting for 4 - 5 billion hectares of land. Forests provide many ecosystem services that humans and animals cannot survive without, but anthropogenic actions and climate change are threatening global forest cover in potentially irreversible ways.

Global Patterns

Forest Cover By The Numbers

According to the FAO's Global Forest Resources Assessment 2020, the world has a total

forest area This article is a list of countries by forest area. Planet, continents and regions All areas are given in units of 1000 hectares. Source: Food and Agriculture Organization Countries and territories All areas are given in units of 1000 h ...

of 4.06 billion hectares (10.0 billion acres), which is 31% of the total land area. More than one-third of the world's forest cover is primary forest: naturally regenerated forests with native species and no visible indication of human activity. More than half (54%) of the world's forests are found in only five countries (

Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ...

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by to ...

China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's List of countries and dependencies by population, most populous country, with a Population of China, population exceeding 1.4 billion, slig ...

Russia Russia (, , ), or the Russian Federation, is a transcontinental country spanning Eastern Europe and Northern Asia. It is the largest country in the world, with its internationally recognised territory covering , and encompassing one-ei ...

and the USA). Russia has the largest forest area in the world, at 815 million hectares (a fifth of global forest cover). The other four countries all house more than 100 million hectares of forest each. The small African nation of Gabon, while only containing 0.58% of the world's forest cover, has the largest forest-to-land ratio of any country (91.3%).

Variation in Forest Ecosystems

Forests are found throughout the world on a spatial scale determined by temperature and precipitation. There are four types of forest biomes:

tropical The tropics are the regions of Earth surrounding the Equator. They are defined in latitude by the Tropic of Cancer in the Northern Hemisphere at N and the Tropic of Capricorn in the Southern Hemisphere at S. The tropics are also referred to ...

temperate In geography, the temperate climates of Earth occur in the middle latitudes (23.5° to 66.5° N/S of Equator), which span between the tropics and the polar regions of Earth. These zones generally have wider temperature ranges throughout ...

, subtropical, and

boreal Boreal may refer to: Climatology and geography *Boreal (age), the first climatic phase of the Blytt-Sernander sequence of northern Europe, during the Holocene epoch *Boreal climate, a climate characterized by long winters and short, cool to mild ...

. Most of the world's forest cover (45%) is found in the tropics, which is defined by high temperature and humidity. The boreal zone, which includes Russia and the

Arctic The Arctic ( or ) is a polar regions of Earth, polar region located at the northernmost part of Earth. The Arctic consists of the Arctic Ocean, adjacent seas, and parts of Canada (Yukon, Northwest Territories, Nunavut), Danish Realm (Greenla ...

, contains the second largest amount of forest (33%). The temperate/subtropical zone, located between the tropical and the boreal, contains 25%. Almost half of global forest cover (49%) is relatively continuous, while 9% is found in fragments with little to no connectivity. Roughly 80% of the world's forest area is found in patches larger than 1 million hectares (2.5 million acres). The remaining 20% is located in more than 34 million patches across the world with the vast majority being less than 1,000 hectares (2,500 acres) in size. Tropical rainforests and boreal

coniferous forests Conifers are a group of cone-bearing seed plants, a subset of gymnosperms. Scientifically, they make up the division Pinophyta (), also known as Coniferophyta () or Coniferae. The division contains a single extant class, Pinopsida. All exta ...

are the least fragmented, whereas subtropical dry forest and temperate oceanic forests are among the most fragmented.

Ecological Impacts

Benefits of Forest Cover

The World Health Organization has compiled a list of ecological goods and services that depend on forests and without which humans could not survive, including: flood and drought mitigation, water purification, erosion control, and disease reduction. Tropical forests especially act as one of the world's largest carbon sinks, accumulating atmospheric carbon dioxide during photosynthesis and thus mitigating climate change. Maintaining the size, continuity, and biodiversity of the world's forests is crucial for human health and prosperity. However, forest cover is severely threatened by

deforestation Deforestation or forest clearance is the removal of a forest or stand of trees from land that is then converted to non-forest use. Deforestation can involve conversion of forest land to farms, ranches, or urban use. The most concentrated ...

, as a direct consequence of

agriculture Agriculture or farming is the practice of cultivating plants and livestock. Agriculture was the key development in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that enabled people ...

grazing In agriculture, grazing is a method of animal husbandry whereby domestic livestock are allowed outdoors to roam around and consume wild vegetations in order to convert the otherwise indigestible (by human gut) cellulose within grass and ot ...

, and

mining Mining is the extraction of valuable minerals or other geological materials from the Earth, usually from an ore body, lode, vein, seam, reef, or placer deposit. The exploitation of these deposits for raw material is based on the econom ...

. Since the onset of agriculture (about 12,000 years ago), the number of trees worldwide has dropped by 46%. Since 1990, the world has lost 178 million ha of forest (an area roughly the size of Libya).

Forest Cover Remediation Tactics

Although global forest area is decreasing, the rate at which we are losing trees has slowed. In the 1990s the world was losing 7.8 million ha of area per year, but in the 2000s this rate slowed to 5.2 million ha, and in the 2010s it shrank even further (down to 4.7 million). This pattern is due to the regeneration abilities of forests, as well as a conscious global effort to reduce deforestation. Plantation forests are one method of

reforestation Reforestation (occasionally, reafforestation) is the natural or intentional restocking of existing forests and woodlands ( forestation) that have been depleted, usually through deforestation, but also after clearcutting. Management A de ...

afforestation Afforestation is the establishment of a forest or stand of trees ( forestation) in an area where there was no previous tree cover. Many government and non-governmental organizations directly engage in afforestation programs to create forests ...

that has become increasingly popular since the 1990s. Intensively planned to be biodiverse and well-managed, these forests exist for the purpose of regenerating our global forest cover. Although it is impossible to gain back the ecosystem services lost when a plot of forest is destroyed for industrial purposes, these new regenerative methods carry hope for the future of our global forest biome.

Sources

References

External links

* {{Forestry by country Deforestation Forests