Logging in tropical forests jeopardizing drinking water

April 16, 2018, Wildlife Conservation Society
River plume draining into the sea full of sediment from upstream logging activity in Western Province, Solomon Islands. Credit: Wade Fairley

Globally, remaining tropical forests are being rapidly cleared, particularly in countries like the Solomon Islands where commercial logging accounts for about 18 percent of government revenue, and at least 60 percent of exports while providing the largest number of formal sector jobs. However, the loss of native forests has huge ecological and social consequences, many of which are poorly documented.

A team of researchers from The University of Queensland (UQ), Wildlife Conservation Society (WCS), and other groups have found that increasing land clearing for logging in Solomon Islands-even with best management strategies in place - will lead to unsustainable levels of soil erosion and significant impacts to downstream water quality.

Combined, these impacts will compromise the integrity of the land for future agricultural uses, interrupt access to clean and degrade important downstream ecosystems.

The researchers published the results of the study in the journal Environmental Research Letters.

The work focused on Kolombangara Island, where efforts are underway to create a national park to safeguard unlogged forests above 400 meters that have both cultural and ecological significance. This effort is being led by the Kolombangara Island Biodiversity Conservation Association (KIBCA), a community-based organisation focused on conserving the island's rich marine and terrestrial biodiversity. The declaration of a protected area would add significant levels of legal protection and explicit controls over land clearing.

UQ School of Earth and Environmental Sciences Postdoctoral Research Fellow Dr. Amelia Wenger, said the research can provide insight into the full range of impacts from logging activities, which are often not taken into consideration.

"When extent reached 40 percent in our models, international standards for safe drinking water were exceeded nearly 40 percent of the time, even if best practices for logging were followed. Loss of the upland forest will compromise local access to clean water essential for drinking, bathing, and household washing," said Wenger.

Findings of this study are being used by KIBCA to communicate to island residents the potential impacts that could occur as a result of logging if the forest was not protected.

KIBCA coordinator Ferguson Vaghi said: "Previously people in Solomon Islands made decisions about logging from a selfish economic perspective. This study highlights that we also need to consider the impacts to the downstream environment."

More broadly, the findings demonstrate that national policies for practice must explicitly link reduction strategies to natural and ecological thresholds, otherwise they will be ineffective at minimizing impacts.

WCS Melanesia Director Dr. Stacy Jupiter concurs: "Saving worldwide depends upon tighter regulation of national laws and policies, as well as local buy-in for forest management. This study nicely illustrates why we need to take action now to protect the world's remaining intact landscapes in order to preserve their biodiversity and important ecosystem services for people."

Explore further: Salvage logging is often a pretext for harvesting wood

More information: Amelia S Wenger et al, Predicting the impact of logging activities on soil erosion and water quality in steep, forested tropical islands, Environmental Research Letters (2018). DOI: 10.1088/1748-9326/aab9eb

Related Stories

Salvage logging is often a pretext for harvesting wood

March 27, 2018

An increasing proportion of the world's protected forests are subject to extensive logging activities. The practice is called "salvage logging" and allegedly aims to protect e.g. areas of windthrow against bark beetle infestation. ...

Recommended for you

Does saving energy save the climate?

December 17, 2018

To stop climate change, saving energy matters less than switching to renewable energy. Indeed, says Anthony Patt, it isn't clear whether saving energy makes much of a difference at all.

Oceans of garbage prompt war on plastics

December 15, 2018

Faced with images of turtles smothered by plastic bags, beaches carpeted with garbage and islands of trash floating in the oceans, environmentalists say the world is waking up to the need to tackle plastic pollution at the ...

A damming trend

December 14, 2018

Hundreds of dams are being proposed for Mekong River basin in Southeast Asia. The negative social and environmental consequences—affecting everything from food security to the environment—greatly outweigh the positive ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.