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A Place Out of Time: Tropical Rainforests and the Perils They Face- information on tropical forests, deforestation, and biodiversity

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雷竞技体育下载热带雨林是森林生态系统的特征high levels of rainfall, an enclosed canopy and high species diversity. While tropical rainforests are the best-known type of rainforest and the focus of this section of the web site, rainforests are actually found widely around the world, including temperate regions in Canada, the United States, and the former Soviet Union.

Tropical rainforests typically occur in the equatorial zone between the Tropic of Cancer and Tropic of Capricorn, latitudes that have warm temperatures and relatively constant year-round sunlight. Tropical rainforests merge into other types of forest depending on the altitude, latitude, and various soil, flooding, and climate conditions. These forest types form a mosaic of vegetation types which contribute to the incredible diversity of the tropics.

The bulk of the world's tropical rainforest occurs in the Amazon Basin in South America. The Congo Basin and Southeast Asia, respectively, have thesecond and third largest areasof tropical rainforest. Rainforests also exist on some the Caribbean islands, in Central America, in India, on scattered islands in the South Pacific, inMadagascar, in West and East Africa outside the Congo Basin, in Central America and Mexico, and in parts of South America outside the Amazon. Brazil has the largest extent of rainforest of any country on Earth.

Rainforests provide important ecological services, including storing hundreds of billions of tons of carbon, buffering against flood and drought, stabilizing soils, influencing rainfall patterns, and providing a home to wildlife and Indigenous people. Rainforests are also the source of many useful products upon which local communities depend.

While rainforests are critically important to humanity, they are rapidly being destroyed by human activities. The biggest cause of deforestation is conversion of forest land for agriculture. In the past subsistence agriculture was the primary driver of rainforest conversion, but today industrial agriculture — especially monoculture and livestock production — is the dominant driver of rainforest loss worldwide. Logging is the biggest cause of forest degradation and usually proceeds deforestation for agriculture.

Organization of this site

The rainforest section of Mongabay is divided into ten "chapters" (the original text for the site was a book, but has since been adapted for the web), with add-on content in the form of special focal sections (e.g. The Amazon, the Congo,lol赔率雷电竞 ,New Guinea,Sulawesi,Forests in Brazil, etc), appendices, and other resources.

There is also a version of the site geared toward younger readers atkids.雷竞技游戏平台官方下载mongabay.com.

ABOUT THE RAINFOREST (SUMMARY)

RAINFOREST DISTRIBUTION AND CHARACTERISTICS

Each rainforest is unique, but there are certain features common to all tropical rainforests.

• Location: rainforests lie in the tropics.
• Rainfall: rainforests receive at least 80 inches (200 cm) of rain per year.
• Canopy: rainforests have a canopy, which is the layer of branches and leaves formed by closely spaced rainforest trees some 30 meters (100 feet) off the ground. A large proportion of the plants and animals in the rainforest live in the canopy.
• Biodiversity: rainforests have extraordinarily highs level of biological diversity or “biodiversity”. Scientists estimate that about half of Earth's terrestrial species live in rainforests.
• Ecosystem services: rainforests provide a critical ecosystem services at local, regional, and global scales, including producing oxygen (tropical forests are responsible for 25-30 percent of the world's oxygen turnover) and storing carbon (tropical forests store an estimated229-247 billion tons of carbon) through photosynthesis;influencing precipitation patterns and weather;moderating flood and drought cycles; andfacilitating nutrient cycling; among others.

The global distribution of tropical rainforests can be broken up into four biogeographical realms based roughly on four forested continental regions: the Afrotropical, the Australiasian, the Indomalayan/Asian, and the Neotropical. Just over half the world's rainforests lie in the Neotropical realm, roughly a quarter are in Africa, and a fifth in Asia.

These realms can be further divided into major tropical forest regions based on biodiversity hotspots, including:

1. Amazon: Includes parts of Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, Venezuela
2. Congo: Includes parts of Cameroon, Central African Republic, Democratic Republic of the Congo, Equatorial Guinea, Gabon, Republic of Congo
3. Australiasia: Includes parts of Australia, Indonesian half of New Guinea, Papua New Guinea
4. Sundaland: Includes parts of Brunei, Indonesia, Malaysia, Singapore
5. Indo-Burma: Includes parts of Bangladesh, Cambodia, China, India, Laos, Myanmar, Thailand, Vietnam
6. Mesoamerica: Includes parts of Belize, Costa Rica, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panama
7. Wallacea: Sulawesi and the Maluku islands in Indonesia
8. West Africa: Includes parts of Benin, Cameroon, Côte d'Ivoire, Ghana, Guinea, Liberia, Nigeria, Sierra Leone, Togo
9. Atlantic forest: Includes parts of Argentina, Brazil, Paraguay
10. Choco: Includes parts of Colombia, Ecuador, Panama

Other countries that have large areas of rainforest include Bolivia, Cameroon, Central African Republic, Ecuador, Gabon, Guyana, India, Laos, Malaysia, Mexico, Myanmar, Papua New Guinea, Republic of Congo, Suriname, and Venezuela.

Cover and loss by rainforest region

RAINFOREST STRUCTURE

Rainforests are characterized by a unique vegetative structure consisting of several vertical layers including the overstory, canopy, understory, shrub layer, and ground level. The canopy refers to the dense ceiling of leaves and tree branches formed by closely spaced forest trees. The upper canopy is 100-130 feet above the forest floor, penetrated by scattered emergent trees, 130 feet or higher, that make up the level known as the overstory. Below the canopy ceiling are multiple leaf and branch levels known collectively as the understory. The lowest part of the understory, 5-20 feet (1.5-6 meters) above the floor, is known as the shrub layer, made up of shrubby plants and tree saplings.

RAINFOREST BIODIVERSITY

雷竞技官网欢迎热带雨林diver雷竞技体育下载sit最大的支持y of living organisms on Earth. Although they cover less than 2 percent of Earth’s surface, rainforests house more than 50 percent of the plants and animals on the planet.

THE RAINFOREST CANOPY

In the rainforest most plant and animal life is not found on the forest floor, but in the leafy world known as the canopy. The canopy, which may be over 100 feet (30 m) above the ground, is made up of the overlapping branches and leaves of rainforest trees. Scientists estimate that more than half of life in the rainforest is found in the trees, making this the richest habitat for plant and animal life.

The conditions of the canopy are markedly different from the conditions of the forest floor. During the day, the canopy is drier and hotter than other parts of the forest, and the plants and animals that live there have adapted accordingly. For example, because the amount of leaves in the canopy can make it difficult to see more than a few feet, many canopy animals rely on loud calls or lyrical songs for communication. Gaps between trees mean that some canopy animals fly, glide, or jump to move about in the treetops. Meanwhile plants have evolved water-retention mechanisms like waxy leaves.

Scientists have long been interested in studying the canopy, but the height of trees made research difficult until recently. Today the canopy is commonly accessed using climbing gear, rope bridges, ladders, and towers. Researchers are even using model airplanes and quadcopters outfitted with special sensors — conservation drones — to study the canopy.

The rainforest floor

The rainforest floor is often dark and humid due to constant shade from the leaves of canopy trees. The canopy not only blocks out sunlight, but dampens wind and rain, and limits shrub growth.

Despite its constant shade, the ground floor of the rainforest is the site for important interactions and complex relationships. The forest floor is one of the principal sites of decomposition, a process paramount for the continuance of the forest as a whole. It provides support for trees responsible for the formation of the canopy and is also home to some of the rainforest's best-known species, including gorillas, tigers, tapirs, and elephants, among others.

Rainforest waters

Tropical rainforests support some of the largest rivers in the world, like the Amazon, Mekong, Negro, Orinoco, and Congo. These mega-rivers are fed by countless smaller tributaries, streams, and creeks. For example, the Amazon alone has some 1,100 tributaries, 17 of which are over 1,000 miles long. Although large tropical rivers are fairly uniform in appearance and water composition, their tributaries vary greatly.

Rainforest waters are home to a wealth of wildlife that is nearly as diverse as the biota on land. For example, more than 5,600 species of fish have been identified in the Amazon Basin alone.

But like rainforests, tropical ecosystems are also threatened. Dams, deforestation, channelization and dredging, pollution, mining, and overfishing are chief dangers.

Rainforest people

雷竞技官网欢迎热带雨林一直部落的雷竞技体育下载家园peoples who rely on their surroundings for food, shelter, and medicines. Today very few forest people live in traditional ways; most have been displaced by outside settlers, have been forced to give up their lifestyles by governments, or have chosen to adopt outside customs.

Of the remaining forest people, the Amazon supports the largest number of Indigenous people living in traditional ways, although these people, too, have been impacted by the modern world. Nonetheless, Indigenous peoples' knowledge of medicinal plants remains unmatched and they have a great understanding of the ecology of the Amazon rainforest.

In Africa there are native forest dwellers sometimes known as pygmies. The tallest of these people, also called the Mbuti, rarely exceed 5 feet in height. Their small size enables them to move about the forest more efficiently than taller people.

There are few forest peoples in Asia living in fully traditional ways. The last nomadic people in Borneo are thought to have settled in the late 2000's. New Guinea and the Andaman Islands are generally viewed as the last frontiers for forest people in Asia and the Pacific.

Deforestation

在最近几十年里已经有一个重要的shift in deforestation trends. Today export-driven industries are driving a bigger share of deforestation than ever before, marking a shift from previous decades, when most tropical deforestation was the product of poor farmers trying to put food on the table for their families. There are important implications from this change. While companies have a greater capacity to chop down forests than small farmers, they are more sensitive to pressure from environmentalists. Thus in recent years, it has become easier—and more ethical—for green groups to go after corporations than after poor farmers.

Rainforests are also threatened by climate change, which is contributing to droughts in parts of the Amazon and Southeast Asia. Drought causes die-offs of trees and dries out leaf litter, increasing the risk of forest fires, which are often set by land developers, ranchers, plantation owners, and loggers.

Rainforest importance

While rainforests may seem like a distant concern, they are critically important for our well-being. Rainforests are often called the lungs of the planet for their role in absorbing carbon dioxide, a greenhouse gas, and producing oxygen, upon which all animals depend for survival. Rainforests also stabilize climate, house incredible amounts of plants and wildlife, and produce nourishing rainfall all around the planet.

Rainforests:

• Help stabilize the world’s climate: Rainforests help stabilize the world’s climate by absorbing carbon dioxide from the atmosphere. Scientists have shown that excess carbon dioxide in the atmosphere from human activities is contributing to climate change. Therefore, living rainforests have an important role in mitigating climate change, but when rainforests are chopped down and burned, the carbon stored in their wood and leaves is released into the atmosphere, contributing to climate change.
• Provide a home to many plants and animals: Rainforests are home to a large number of the world’s plant and animals species, including many endangered species. As forests are cut down, many species are doomed to extinction.
• Help maintain the water cycle: The role of rainforests in the water cycle is to add water to the atmosphere through the process of transpiration (in which plants release water from their leaves during photosynthesis). This moisture contributes to the formation of rain clouds, which release the water back onto the rainforest. In the Amazon, 50-80 percent of moisture remains in the ecosystem’s water cycle. When forests are cut down, less moisture goes into the atmosphere and rainfall declines, sometimes leading to drought. Rainforests also have a role in global weather patterns. For example researchers have shown thatforests in South America affect rainfall in the United States, while forests in Southeast Asia influence rain patterns in southeastern Europe and China. Distant rainforests are therefore important to farmers everywhere.
• Protect against flood, drought, and erosion: Rainforests have been compared to natural sponges, moderating flood and drought cycles by slowing run-off and contributing moisture to the local atmosphere. Rainforests are also important in reducing soil erosion by anchoring the ground with their roots. When trees are cut down there is no longer anything to protect the ground, and soils are quickly washed away with rain. On steep hillsides, loss of forest can trigger landslides.
• Are a source for medicines and foods and support forest-dependent people: People have long used forests as a source of food, wood, medicine, and recreation. When forests are lost, they can no longer provide these resources. Instead people must find other places to get these goods and services. They also must find ways to pay for the things they once got for free from the forest.

Rainforest conservation

Rainforests are disappearing very quickly. The good news is there are a lot of people who want to save rainforests. The bad news is that saving rainforests will be a challenge as it means humanity will need to shift away from business-as-usual practices by developing new policies and economic measures to creative incentives for preserving forests as healthy and productive ecosystems.

Over the past decade there has been considerable progress on several conservation fronts. Policymakers and companies are increasingly valuing rainforests for the services they afford, setting aside large blocks of forests in protected areas and setting up new financial mechanisms that compensate communities, state and local governments, and countries for conserving forests. Meanwhile, forest-dependent people are gaining more management control over the forests they have long stewarded. Large international companies are finally establishing policies that exclude materials sourced via deforestation. People are abandoning rural areas, leading to forest recovery in some planes.

But the battle is far from over. Growing population and consumption means that rainforests will continue to face intense pressures. At the same time, climate change threatens to dramatically alter temperatures and precipitation patterns, potentially pushing some forests toward critical tipping points.

Thus the future of the world's rainforests in very much in our hands. The actions we take in the next 20 years will determine whether rainforests, as we currently know them, are around to sustain and nourish future generations of people and wildlife.

The Latest News on Rainforests

Forests & finance: protection and restoration in Cameroon and Senegal, fire threat in Angola(Apr 13 2023)
- A new project aims to reform Cameroon's domestic timber market and reduce unregulated felling of trees.
- Scientists fear pockets of species-rich afromontane forest in Angola’s Namba Mountains will be lost if uncontrolled fires continue.
- A Senegalese association is protecting and restoring southern Senegal's tree cover by establishing community forests.
- Forests & Finance is Mongabay’s bi-weekly bulletin of briefs about Africa’s forests.

Ecuador banned gas flaring over a year ago. Why is it still happening?(Apr 12 2023)
- In September 2021, a provincial court gave oil companies 18 months to eliminate gas flaring in the Amazon because of its role in spiking cancer rates among local residents.
- That deadline expired in March, but today oil companies continue to use gas flares more than ever. Before the court ruling, there were an estimated 447 gas flares in the country. Today, there are 475.
- Activists say they still have some legal avenues for pressuring the government to enforce the ban, including impeaching ministers that fail to comply with the court’s order.

Report: Indonesia’s ‘food estate’ program repeating failures of past projects(Apr 11 2023)
- Some of the large-scale food plantations established by the Indonesian government under a “food estate” program have reportedly been abandoned.
- A field investigation in 2022 and 2023 found wild shrubs and abandoned excavators on plots of lands that had been cleared for cassava and rice in Central Kalimantan province.
appare -活动积极分子表示,计划的失败nt from the start, with a lack of proper impact assessments carried out prior to selecting sites and clearing forests for crops ill-suited to the soil.
- The program’s trajectory mirrors that of the Mega Rice Project from the mid-1990s, which failed spectacularly to boost yields, and left in its wake widespread destruction of carbon-rich peatlands.

Flawed count puts ‘glorified’ Javan rhinos on path to extinction, report says(Apr 11 2023)
- Javan rhinos, a critically endangered species found only in a single park in Indonesia, may be on a population decline that could see the species go extinct within a decade, a new report warns.
- The report highlights questionable practices in the Indonesian government’s official population count, which has shown a steady increase in rhino numbers since 2011.
- Notably, the official count includes rhinos that haven’t been spotted or recorded on camera traps in years; at least three of these animals are known to have died since 2019.
- The report, by environmental NGO Auriga Nusantara, also highlights an increase in reported poaching activity in Ujung Kulon National Park, and a general lack of official transparency that’s common to conservation programs for other iconic species such as Sumatran rhinos and orangutans.

To build its ‘green’ capital city, Indonesia runs a road through a biodiverse forest(Apr 10 2023)
- A new toll road in Indonesia’s East Kalimantan province is under construction to improve access to the interior of Borneo, including to the nation’s new capital city, Nusantara.
- Construction of the road, however, poses immediate environmental risks, as the route cuts through a forested area with high conservation value that connects the Sungai Wain protected forest, coastal mangroves, and Balikpapan Bay.
- Prior to road construction, the integrated forest and coastal ecosystem supported populations of orangutans, sun bears, proboscis monkeys and Irrawaddy dolphins.
自然资源保护者说这建设ll road belies the Indonesian government’s claims that the development of the new capital will be green and sustainable.

Indonesian Indigenous group AMAN wins Skoll Award for defending land rights(Apr 10 2023)
- Indonesia's main Indigenous alliance, AMAN, has won a 2023 Skoll Award for Social Innovation for its work in advocating for Indigenous rights.
- The group’s work includes mapping Indigenous territories and lobbying for legislation that supports and protects Indigenous rights to their lands.
- AMAN says the award fuels its spirit to work even harder, as there’s still much work to be done, with many Indigenous communities still lacking legal recognition of their land rights and an Indigenous rights bill being stalled in Parliament.
- Four other organizations have won this year’s award, including Conexsus, a Brazilian NGO that promotes sustainable forest management and forest-based economies by centering community-led efforts and Indigenous ecological knowledge.

Where Indigenous land rights prevail in Brazil, so does nature, study finds(Apr 6 2023)
- A study that looked at changes in forest cover in 129 Indigenous territories in Brazil’s Atlantic Forest between 1995 and 2016 has found that deforestation rates were lower and reforestation rates higher in those where land tenure had been formalized.
- Among the reasons for this, researchers suggest, is the fact that Indigenous peoples felt more encouraged to revive the forest, safe in the knowledge that they will be protected by the law.
- However, securing land tenure, a process known as demarcation, has proved difficult for many Indigenous communities, with former president Jair Bolsonaro refusing to sign off on any demarcation during his time in office from 2019-2022.
- Under the new president, Luiz Inácio Lula da Silva, Indigenous leaders say they’re more optimistic about having their land tenure formally recognized.

Peru national park sees deforestation spike despite carbon credit program: report(Apr 6 2023)
- A March report from the Associated Press revealed that the carbon credit program in Peru’s Cordillera Azul National Park has been financially profitable but ineffective as a means of conservation.
- Despite that more than 28 million credits have been sold since the program’s launch in 2008, average annual deforestation has risen significantly.
——问题是,官员的一个来源inflated the benefits of the program and the threats facing the park.

Rainforest reporting: Journalists discuss the challenges & dangers of Amazonia(Apr 4 2023)
- We speak with journalists who have known and reported on Amazonia for years, and who also know the violence in the region like the back of their hands.
- Repórter Brasil’s Daniel Camargos speaks about how he adapted his way of working after the deaths of journalist Dom Phillips and Indigenous specialist Bruno Pereira.
- Combat journalist Lúcio Flávio Pinto shares good memories of his extensive trajectory reporting directly from Amazonia.
- Finally, photojournalist Michael Dantas and Talita Bedinelli from Sumaúma tell of their coverage and experiences with the Yanomami people.

Guinea’s crab-fishing chimps are in good health, study shows, but threats loom(Apr 3 2023)
- An international team has used genetic censusing — analyzing DNA from fecal samples — to work out the size of a population of critically endangered chimpanzees in Guinea.
- At least 136 adult chimpanzees were identified living in four communities on the western flanks of Guinea’s Nimba Mountains, part of a UNESCO World Heritage Site.
- Iron ore mining is planned in a northern section of the mountains, in an area the chimpanzees use to disperse between their separate communities.
- The scientists warn that human activities that hinder or restrict chimpanzee movements or territories can trigger deadly battles between rival communities of the apes and compromise their genetic diversity.

Ecuador court upholds ‘rights of nature,’ blocks Intag Valley copper mine(Mar 31 2023)
- Community members in Ecuador’s Intag Valley have won a court case to stop the Llurimagua copper mining project, with the court ordering the revocation of mining licenses from Chile’s Codelco and Ecuador's ENAMI EP.
- The Llurimagua mining concession is in the Tropical Andes, the world's most biodiverse hotspot, home to dozens of threatened and endemic species, including two near-extinct frog species.
- A provincial court recognized that the mining companies violated the communities' constitutional right to consultation and the rights of nature guaranteed by Ecuador's Constitution since 2008.
- The decision is a significant win for the Intag communities, who have resisted mining for nearly 30 years, and sets an important precedent for protecting constitutional and environmental rights, as well as sends a message to investors that Ecuador is not a safe bet for mining operations.

Reconnecting ‘island habitat’ with wild corridors in Brazil’s Atlantic Forest(Mar 30 2023)
- This three-part Mongabay mini-series examines grassroots forest restoration projects carried out within isolated island ecosystems — whether those islands are surrounded by ocean as on the Big Island of Hawai‘i, or cloud forest mountaintop habitat encircled by lowlands in Costa Rica, or forest patches hemmed in by human development in Brazil.
- Reforestation of degraded island habitat is a first step toward restoring biodiversity made rare by isolation, and to mitigating climate threats. Though limited in size, island habitats can be prime candidates for reforestation because extinctions are typically much higher on isolated habitat islands than in more extensive ecosystems.
- Scientists mostly agree that the larger the forest island habitat, the greater its biodiversity, and the more resilient that forest system will be against climate change. Forests also store more carbon than degraded lands, and add moisture to soil and the atmosphere as a hedge against warming-intensified drought.
- The projects featured in this series are small in size, but if scaled up could become big forest nature-based climate solutions. In this third story, the NGO Saving Nature works to create wild corridors to reconnect fragmented patches of Brazil’s Atlantic Forest.

In central Brazil, mining company ignores Quilombola concerns over gold project(Mar 29 2023)
- Canadian mining company Aura Minerals plans to establish a major gold extraction project in Brazil’s Tocantins state without hearing the Quilombola (slave descendant) community that will be affected by the operations, thus violating their right to free, prior and informed consultation.
- So far, the company has not been transparent toward the community and has not described the potential impacts.
- Meanwhile, Aura Minerals has seen its value rise nearly 700% on the Toronto Stock Exchange between 2019 and 2022 — the best performance among 3,500 listed companies.
- The Quilombola estimate that, in the event of an accident with the company’s dam, the Baião community would be instantly engulfed and would disappear completely, with no chance to react.

Mountain islands: Restoring a transitional cloud forest in Costa Rica(Mar 29 2023)
- This three-part Mongabay mini-series examines grassroots forest restoration projects carried out within isolated island ecosystems — whether those islands are surrounded by ocean as on the Big Island of Hawai‘i, or cloud forest mountaintop habitat encircled by lowlands in Costa Rica, or forest patches hemmed in by human development in Brazil.
- Reforestation of degraded island habitat is a first step toward restoring biodiversity made rare by isolation, and to mitigating climate threats. Though limited in size, island habitats can be prime candidates for reforestation because extinctions are typically much higher on isolated habitat islands than in more extensive ecosystems.
- Scientists mostly agree that the larger the forest island habitat, and greater its biodiversity, and the more resilient that forest system will be against climate change. Forests also store more carbon than degraded agricultural lands, and add moisture to soil and the atmosphere as a hedge against global warming-intensified drought.
- The projects featured in this series are small in size, but if scaled up could become big forest nature-based climate solutions. In this second story, two tourists vacationing in Costa Rica and stunned by the deforestation they see, buy degraded land next to Chirripó National Park and restore a transitional cloud forest.

Mexico’s Tren Maya hotel construction clears forest reserve without permits(Mar 29 2023)
- The construction of a hotel in Mexico’s Calakmul Biosphere Reserve took many residents by surprise when bulldozers started clearing the forest in January.
- The hotel is part of the Tren Maya project, a controversial railway line that will move tourists and cargo throughout the Yucatán Peninsula and southern Mexico.
- Residents said they weren’t consulted and that the location of the project is dangerously close to Maya ruins and important sources of freshwater.