Soil communities threatened by destruction, instability of Amazon forests

Soil communities threatened by destruction, instability of Amazon forests
Invertebrates such as earthworms, ants and termites were more vulnerable to the displacement of forests with pastures than by crops, while microbes showed the opposite pattern. Credit: Andre L.C. Franco/ Colorado State University

The clearing and subsequent instability of Amazonian forests are among the greatest threats to tropical biodiversity conservation today.

Although the devastating consequences of deforestation to plants and living above the ground are well-documented, scientists and others need to better understand how communities respond to this deforestation to create interventions that protect and the ecosystem. But that information has been lacking.

A team of researchers led by Colorado State University's André Franco, a research scientist in the Department of Biology, conducted a meta-analysis of nearly 300 studies of soil biodiversity in Amazonian forests and sites in various stages of deforestation and land-use.

The new study, "Amazonian deforestation and soil biodiversity," is published in the June issue of Conservation Biology and is co-authored by CSU Distinguished Professor Diana Wall, Bruno Sobral, professor in the Department of Microbiology, Immunology and Pathology at CSU, and Artur Silva, professor at the Universidade Federal do Pará in Belém, Brazil.

Overall, the researchers found that the abundance, biomass, richness and diversity of soil fauna and microbes were all reduced following deforestation. Soil fauna or animals that were studied include earthworms, millipedes, dung beetles, nematodes, mites, spiders and scorpions.

Franco, who hails from Brazil, said that this is the first time that all of the available scientific data related to soil biodiversity in Amazonian forests has been synthesized.

The research team also found that the way the land is used after the is cleared matters to soil biodiversity. Species of invertebrates such as earthworms, ants and termites—which are described as soil engineers—were more vulnerable to the displacement of forests with pastures than by crops, while microbes showed the opposite pattern.

Franco said the highest biodiversity losses were found on the side of the Amazon with the highest mean annual precipitation and in areas where the soil was very acidic.

Soil communities threatened by destruction, instability of Amazon forests
The team is currently working with farmers' associations and two research institutes in Brazil to collect and analyze soil samples, with the goal of studying the consequences of this loss of biodiversity. Credit: Andre L.C. Franco/Colorado State University

"That means these areas should be higher priorities for conservation efforts," he said.

Scientists also uncovered gaps in existing research.

"Very few studies looked at the impact of disturbances like wildfires and selective logging on these forests," Franco said. "Yet logging is an official management strategy in the Amazon forest."

In addition, the team found a lack of data from seven of the nine countries that the Amazon biome covers parts of, including Bolivia, Peru, Ecuador, Venezuela, Guyana, Suriname and French Guiana.

Sobral noted that biodiversity is a hot topic and was elevated recently with the release of a report from the United Nations, which found that nature is declining globally at unprecedented rates. But most of the scientific knowledge in the world about biodiversity relates to birds and mammals, he said.

The team is continuing this research in the Amazon, working with farmers' associations and two research institutes in Brazil to collect and analyze soil samples with the goal of studying the consequences of this loss of biodiversity.

Zaid Abdo, a bioinformatics expert and associate professor in the Department of Microbiology, Immunology and Pathology, has joined the CSU-based research team.

Sobral said it's extremely important that the scientists work with and others who are impacted by the deforestation.

"We're very focused on making sure the research isn't disconnected from local communities' needs and aspirations," he said. "Our work is guided by what the farmers want to know and how scientific knowledge could shape their future sustainable development."


Explore further

Reduced impact logging still harms biodiversity in tropical rainforests

More information: André L.C. Franco et al, Amazonian deforestation and soil biodiversity, Conservation Biology (2018). DOI: 10.1111/cobi.13234
Journal information: Conservation Biology

Citation: Soil communities threatened by destruction, instability of Amazon forests (2019, May 24) retrieved 18 June 2019 from https://phys.org/news/2019-05-soil-threatened-destruction-instability-amazon.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
17 shares

Feedback to editors

User comments

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