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Residues removal in eucalyptus forests: influence on the fungi community and phosphorus cycling in soil

Grant number: 18/20553-8
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): February 01, 2021
Effective date (End): February 28, 2022
Field of knowledge:Agronomical Sciences - Agronomy - Soil Science
Principal Investigator:Elke Jurandy Bran Nogueira Cardoso
Grantee:Maiele Cintra Santana
Home Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil
Associated research grant:16/18944-3 - Climatic changes and energetic efficiency in agriculture: focusing on hydric stress, organic management and soil biology, AP.PFPMCG.TEM

Abstract

Forest residues play a fundamental role in the chemical, physical and soil biological properties, such as carbon contents, erosion protection and nutrient the availability for microbial metabolism. The forest residues removal practice for energy generation seems to be against to the minimum tillage system, which represents a beneficial forest management for soil and trees health. There are no studies evaluating the influence forest residues removal on the fungi community, mainly tropical soils conditions. This gap is very important because the impact on the fungal community caused by the residues removal alter the phosphorus (P) cycling in the soil, increasing the need for phosphate mineral fertilizers. In this way, a long-term experiment will be evaluated, installed with several levels of residues removal using the Eucalyptus grandis culture as a model. We will characterize the soil and access the fungi community in order to identify important parameters associated with phosphorus cycling (P). Our general hypothesis is that the consecutive forest residues removal reduces the diversity and key functions of the fungal community, altering soil P cycling. The experiment was installed in 2004 and reinstalled in 2012 (first and second rotation, respectively), in the Itatinga Experimental Station of Forestry Sciences (ESALQ-USP) in a Typically dystrophic Yellow Latosol with a medium sandy texture. In this experiment, soil samples and fine roots of the organic horizon (H-org., ~ 0-5 cm) and mineral (H-min., ~ 5-20 cm) in two seasons of the year (dry and rainy). Analyzes of soil chemical and physical characterization will be performed, as well as the microbial-enzymatic activity of the soil fungi community, abundance of spores and root colonization rate by mycorrhizal fungi (FM). The taxonomic profile of the total fungi community and FM will be evaluated through the large-scale sequencing of the ITS and 18S regions. We hope to provide a solid basis for linking the dynamics of the fungi community to the forestry practice. The association of these parameters will be relevant to the decision making on the removal (or not) of the forest residues, in the light of a consistent evaluation of the P cycling in the soil.