Loss of soil (macro)fauna due to the expansion of Brazilian sugarcane acreage

Autor(es)

Franco, Andre L. C. ^{[1, 2, 3]} ; Bartz, Marie L. C. ^[4] ; Cherubin, Mauricio R. ^[2] ; Baretta, Dilmar ^[5] ; Cerri, Carlos E. P. ^[6] ; Feigl, Brigitte J. ^[2] ; Wall, Diana H. ^{[1, 3]} ; Davies, Christian A. ^[7] ; Cerri, Carlos C. ^[2]

Afiliação do(s) autor(es)

^[1] Colorado State Univ, Dept Biol, Ft Collins, CO 80523 - USA

^[2] Univ Sao Paulo, Ctr Nucl Energy Agr, Ave Centenario 303, BR-13416000 Piracicaba, SP - Brazil

^[3] Colorado State Univ, Sch Global Environm Sustainabil, Ft Collins, CO 80523 - USA

^[4] Univ Posit, Rua Prof Pedro Souza 5300, BR-81280330 Curitiba, PR - Brazil

^[5] Santa Catarina State Univ, Rua Beloni Zanin 680E, BR-89815630 Chapeco, SC - Brazil

^[6] Univ Sao Paulo, Dept Soil Sci, Luiz de Queiroz Coll Agr, Ave Padua Dias 11, BR-13418900 Piracicaba, SP - Brazil

^[7] Shell Technol Ctr Houston, 3333 Highway 6 South, Houston, TX 77082 - USA

• Tipo de documento: Artigo Científico
• Fonte: Science of The Total Environment; v. 563, p. 160-168, SEP 1 2016.
• Citações Web of Science: 15

Resumo

Land use changes (LUC) from pasture to sugarcane (Saccharum spp.) crop are expected to add 6.4 Mha of new sugarcane land by 2021 in the Brazilian Cerrado and Atlantic Forest biomes. We assessed the effects of these LUC on the abundance and community structure of animals that inhabit soils belowground through a field survey using chronosequences of land uses comprising native vegetation, pasture, and sugarcane along a 1000-km-long transect across these two major tropical biomes in Brazil. Macrofauna community composition differed among land uses. While most groups were associated with samples taken in native vegetation, high abundance of termites and earthworms appeared associated with pasture soils. Linear mixed effects analysis showed that LUC affected total abundance (X-2(1)= 6.79, p=0.03) and taxa richness (X-2(1)=6.08, p=0.04) of soil macrofauna. Abundance increased from 411 +/- 70 individuals m(-2) in native vegetation to 1111 +/- 202 individuals m(-2) in pasture, but decreased sharply to 106 +/- 24 individuals m(-2) in sugarcane soils. Diversity decreased 24% from native vegetation to pasture, and 39% from pasture to sugarcane. Thus, a reduction of similar to 90% in soil macrofauna abundance, besides a loss of similar to 40% in the diversity of macrofauna groups, can be expected when sugarcane crops replace pasture in Brazilian tropical soils. In general, higher abundances of majormacrofauna groups (ants, coleopterans, earthworms, and termites) were associated with higher acidity and low contents of macronutrients and organic matter in soil. This study draws attention for a significant biodiversity loss belowground due to tropical LUC in sugarcane expansion areas. Given that many groups of soil macrofauna are recognized as key mediators of ecosystem processes such as soil aggregation, nutrients cycling and soil carbon storage, our results warrant further efforts to understand the impacts of altering belowground biodiversity and composition on soil functioning and agriculture performance across LUC in the tropics. (c) 2016 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 12/22510-8 - Macroinvertebrados e os processos de engenharia do solo: controles sobre a estocagem de matéria orgânica do solo em áreas com mudanças no uso da terra
• Beneficiário: Andre Luiz Custodio Franco
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 13/17581-6 - QUALIDADE DO SOLO EM ÁREAS DE MUDANÇA DE USO DA TERRA PARA CULTIVO DA CANA-DE-AÇÚCAR NO CENTRO-SUL DO BRASIL - bases para avaliação da sustentabilidade ambiental do etanol
• Beneficiário: Maurício Roberto Cherubin
• Modalidade de apoio: Bolsas no Brasil - Doutorado