Can we replant the planet's rainforests?

So, can we push up our sleeves, grab a shovel, dig in and just start replanting therainforests? To a certain extent, we can. However, while efforts at reforestation have significant value, they're usually not as crucial as preserving existing rainforests. Rainforest conservation is just as important as trying to reforest other areas.

Reforestation can be accomplished by nature, by humans or through a combination of the two. Some reforestation efforts focus on growing forests quickly because these woodlands are key to many ofEarth'snatural cycles, such as the carbon andwatercycles. Replanting deforested land with quick-growing exotic tree species, like eucalyptus or Australian acacia, can help solve immediate problems such as soil erosion and elevated carbon levels.

However, exotic trees may make the land unsuitable for future rainforest cultivation by changing the soil's original characteristics. Scientists need to study individual situations to determine what type of impact each foreign species will make on the area's microbial life, and what the appropriate choices are for reforestation. On a positive note, fast-growingsecondary forestsand tree farms can replaceprimary forestsas a source for agricultural and energy needs. A primary forest is basically one that's undisturbed by humans and has suffered very few ecological disruptions. There are several other names for a primary forest, such asold growthandprimeval forest. A secondary forest is one that has regrown after a destructive event, like a fire or logging. Primary forests usually have much higher levels of biodiversity than secondary ones, which is part of the reason conservationists are trying to save old growth [source:Butler].

森林砍伐严重的地区,剩余patches of primary forests are often located at great distances from other surviving rainforests or reforested regions. This makes animal survival and recolonization, as well as plant cross-pollination, difficult and can impede efforts to sustain actual rainforest ecology. Although the parcels of vegetative land can increase the chance of some species' short-term survival, researchers say the species are likely doomed to extinction over the long term.

One way conservationists seek to protect rainforest species is to reforest the corridors of trees that lie between rainforest parcels. This gives plants and animals access to a larger habitat and the chance to mix with other populations, which can boost their genetic diversity and help prevent extinction through isolation for most species. Conservationists can help cultivate these arboreal arteries into supportable rainforest habitats by working to have these corridors widened. The wider the corridors are, the safer they become for migrating animals to use.

It's also important to reforest and enlarge areas adjacent to these surviving parcels. This provides an easy means for species to inhabit new territory and expand viable rainforest ecology.

Researchers are exploring several options for improving and easing reforestation efforts. One inventive method involvesbats. Installing man-made bat roosts in deforested areas can encourage these uniquely flight-enabled mammals (like the spectacled flying fox) to spread seeds and begin the process of rainforest regeneration. Activities like installing bat roosts are examples of how people are a part of natural reforestation efforts.

Reforestation is gaining momentum on a global scale. To get a better idea of worldwide reforestation efforts, go to the next page.

Reforestation efforts are sprouting up all around the world. Numerous conservation groups are working to preserve, enlarge and connect the world'srainforests. Let's take a closer look at some of those projects.

Rwanda's government and various ecological groups are paying special attention to the Gishwati Forest Reserve. Once a vast rainforest, activities such as deforestation and refugee resettlement reduced it to a fraction of its original size around the turn of the century [source:Science Daily]. Since then, reforestation has somewhat increased the size of the forest, but it remains a sliver of its original size.

A project called the Rwandan National Conservation Park is gaining momentum, and those people involved with the project are working to bring the rainforest back and connect it with larger, surviving rainforests nearby. These individuals and organizations are looking to accomplish this through the use of wide tree corridors. They also plan to increase the acreage of the core forest and study the ecology of the forest's animals, particularly its chimpanzees.

Indonesia, where extensive rainforests have been severely decimated, is also investing in reforestation. On Nov. 28, 2007, each of the country's 79,000 government institutions planted 1,000 trees -- contributing 79 million trees in all [source: Anderton]. This effort aligns with other tree-planting projects, as well as vigorous monitoring of illegal logging operations.

In Brazil, the pace of rainforest loss has begun to slow, and several conservation efforts are underway [source: Ausubel]. Huge projects that involve the cooperation of many Brazilian and international organizations have been working to replant the rainforests. Developing and building vast networks of corridors is one major focus, along with species protection and protective breeding programs. Conservationists have also worked to educate the local community about the value of a thriving rainforest. In addition, ranchers and farmers receive incentives for cultivating forest parcels on their lands.

The United Nations Environment Programme met with such success during its worldwide Billion Tree Campaign -- the 1 billion mark was hit in just eight months -- that the new goal is 7 billion trees [source: U.N.] They hope to achieve this goal by the end of 2009, and citizens from around the globe are invited to pledge plantings and register their planted trees atPlant for the Planet: Billion Tree Campaign.

To find out more about the benefits of reforestation, how you can get involved and other great links about replanting the rainforests, follow the links on the next page.

This was one of the many articles I have been called upon to write where my understanding of the issue underwent interesting twists during the course of my research. That's because I came to realize there was a related, yet larger issue at hand. While we can, to some extent, replant rainforests, we desperately need to stop cutting down the rainforests that still remain. Then, through replanting initiatives, we need to reconnect what's left like pearls on a treasured necklace. Rainforests contain a gift beyond measure -- biodiversity -- and squandering that for the sake of unsustainable activities like mining and agriculture is dangerously shortsighted. Now of course, I know there are many other factors and stakeholders involved that make such a course of action challenging, but after reading about what the rainforests of the world have done for us in terms of modern medicine alone, well, it's my opinion that we need to make saving, then replenishing them, the order of priority.

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