Agricultural land-use change alters the structure and diversity of Amazon riparian forests

10 de dezembro de 2020

dez 10, 2020

Leonardo Maracahipes-Santos, Divino V. Silvério, Marcia N. Macedo, Leandro Maracahipes, Kathi JoJankowski, Lucas N. Paolucci, Christopher Neill, Paulo M.Brando

Riparian forests play key roles in protecting biodiversity and water resources, making them priorities for conservation in human-dominated landscapes, but fragmentation associated with expanding tropical croplands threatens their ecological integrity. We compared the structure of tropical riparian forests within intact and cropland catchments in a region of intensive soybean production in the southeastern Brazilian Amazon. We studied forest plots (varying from 120 to 210 m long) that bisected riparian zone forests and headwater streams in ten catchments. Four plots were within large areas of intact primary forest and six were in bands of protected riparian forest along streams within croplands as required by the Brazilian Forest Code. We found that riparian forests in croplands harbored fewer species of trees and seedlings/saplings, and had higher proportions of opportunistic, pioneer tree species. We also found greater variation in tree species composition, and higher internal dissimilarity in croplands compared with forests. The observed patterns in tree species composition were driven mainly by differences between riparian forest-cropland edges and those bordering intact upland forests. Forests nearest to streams in cropland and forested catchments were more similar to one another. Results suggest that wider buffers are needed at the edges of croplands to maintain riparian forest structure. The minimum 30-m riparian buffers now required by the Brazilian Forest Code may thus be insufficient to prevent long-term shifts in riparian forest species composition and structure.

Artigo completo

Full article

Baixar (sujeito à disponibilidade)

Download (subject to availability)



Este projeto está alinhado aos Objetivos de Desenvolvimento Sustentável (ODS).

Saiba mais em brasil.un.org/pt-br/sdgs.

Veja também

See also

Frontier Governance in Amazonia

Frontier Governance in Amazonia

Throughout human history, the world's great forest formations have yielded to logging, cattle ranching, and agricultural expansion after transportation corridors made them accessible to frontier settlers. The Brazilian Amazon could prove to be an exception to this...

Boletim Amazônia em Pauta 9 – O ICMS Verde como incentivo à conservação do meio ambiente em municípios paraenses

Boletim Amazônia em Pauta 9 – O ICMS Verde como incentivo à conservação do meio ambiente em municípios paraenses

No ICMS Verde é um instrumento econômico da política ambiental, com função compensatória (compensa a restrição do uso da terra nos municípios devido à presença de áreas protegidas) e incentivadora (incentiva os municípios a ampliarem suas áreas conservadas). Porém,...