Soil Bacterial Community Changes in Sugarcane Fields Under Straw Removal in Brazil
| Autor: | Maurício Roberto Cherubin, Laisa Gouveia Pimentel, Carlos Eduardo Pellegrino Cerri, Dener Maurício da Silva Oliveira, Fernando Dini Andreote, Thiago Gumiere, Carlos Clemente Cerri |
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| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Crop residue animal structures Renewable Energy Sustainability and the Environment 020209 energy Crop yield food and beverages Biomass 02 engineering and technology Straw 01 natural sciences Soil quality Terminal restriction fragment length polymorphism Agronomy Cellulosic ethanol Bioenergy 010608 biotechnology 0202 electrical engineering electronic engineering information engineering Environmental science PALHAS Agronomy and Crop Science Energy (miscellaneous) |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 1939-1242 1939-1234 |
| Popis: | Global promotion of bioenergy for mitigating climate changes has arisen the interest of the Brazilian sugarcane industry to use crop residue (straw) as an important source of biomass for bioelectricity and cellulosic ethanol production. However, the sugarcane straw influences several soil properties, supporting soil quality and crop yields. Thus, defining an optimal removal rate would keep the benefits of the sugarcane straw in soil, and also maximize the bioenergy production. Shifts on soil bacterial structure have been used as a sensitive indicator of land management and could help to prescribe an optimal removal rate. We conducted a field study at two sites in Sao Paulo state to investigate how rates of sugarcane straw removal are associated with soil bacterial community changes over 1 year. Four sugarcane straw removal rates were evaluated: no removal (~ 14 Mg ha−1 of dry mass left) and 50% (~ 7.0 Mg ha−1), 75% (~ 3.5 Mg ha−1), and 100% of straw removal. The soil bacterial community structure was evaluated by the terminal restriction fragment length polymorphism (T-RFLP). Our results indicated that soil bacteria communities change over time, regardless of site conditions, and their changes are more strongly associated with changes on straw composition. A similar straw decomposition dynamics was observed under moderate (50%) and no removal treatments. Moderate straw removal induced the lowest modification of the bacterial niche occupancy and highest microbial interaction when compared with the no removal. Therefore, the identification of changes in soil bacterial structure community is useful to provide guidance for sugarcane straw removal. |
| Databáze: | OpenAIRE |
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