Effects of Fertilizer Addition on Microbial Respiration and Uptake of Carbon Monoxide in a Cerrado Soil Marirosa Molina 1, Richard Zepp 1, Alessandra Kozovits.

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Presentation transcript:

Effects of Fertilizer Addition on Microbial Respiration and Uptake of Carbon Monoxide in a Cerrado Soil Marirosa Molina 1, Richard Zepp 1, Alessandra Kozovits 2, Joana Bresolin 2, and Mercedes Bustamante 2 1 U.S. EPA, Athens, GA 2 Universidade de Brasilia, Brasilia, Brazil

Região do Cerrado Região do Cerrado Cerrado RR AP AM PA AC RO MT TO MA CE RN PB PE AL SE PI BA GO DF MG ES RJ SP MS PR SC RS Área Total : ha

O Cerrado Brasileiro The Cerrado is a Region of Rapid Land Conversion

O Cerrado Brasileiro The Cerrado is a Region of Rapid Land Conversion

O Cerrado Brasileiro The Cerrado is a Region of Rapid Land Conversion

1999

Fertilizer Use and Crop Production in Brazil A.S. Lopes, FAO Corporate Document, 2002

Objective To determine the effect of fertilizer treatments on the microbial decomposition rates of soil organic matter (SOM) pools and consumption of carbon monoxide (CO) in soil samples from native Cerrado areas.

LBA Study Sites

Fertilization Experiment - Cerrado Stricto sensu P P P P N N N N N+P C C C C Ca m Fertilizers Applied (granulate form): N: 100 kg N/ha (ammonium sulfate) P: 100Kg P/ha (Super phosphate simple) N + P: 100 Kg/Ha (each) Ca: 4000 kg/ha (lime + calcium phosphate) C: control

Phospholipid Fatty Acid (PLFA) Analysis Nomenclature: #C : #B w # i.e., 17:1w8

Effect of Different Fertilization Treatments on the Microbial Community Structure in Cerrado Soils

Microbial Community Structure in Fertilized Cerrado Soils as a Function of Time (Days after Fertilization)

Long-term Incubation Experiment Collect Soil samples 0-10 cm cm Sieving Addition of Soil and Nutrients to Jars CO 2 (Licor) Fertilizers added: N, P, N+P All fertilizers added in granular form Jars were incubated in the dark at room temperature, at 60% WHC for 143 days. CO (Trace A)

Average CO 2 flux from soils (0-10 cm depth) amended with N and P (Long Term Incubation Experiment)

CO 2 flux in Soils (0-10 cm deep) Amended with Fertilizers (Long Term Incubation Experiment)

Average CO 2 Flux in Soils (10-20 cm depth) Amended with N and P in a Long Term Incubation Experiment

Exponential Decay Constants for the Active and Slow C Pools in Cerrado Soils Amended with Fertilizers Treatments Original Soil Depth (cm) Active C kaT 99 (days)Slow C ksT 99 (days) Control N P N+P Control x x N x P x N+P x CO 2 flux = C a e -kat + C s e -kst

% Organic Carbon respired as CO 2 in Soils Amended with Fertilizers

Laboratory Studies of CO Uptake By Cerrado strictu sensu Soil Treated with Fertilizer

= Flux / [CO] = Flux / [CO] = First order k x vol/surface area = First order k x vol/surface area Definition of Deposition Velocity (cm s -1 )

Deposition Velocities for CO Uptake By Soil Treated With Fertilizer

Control N N+P CO Fluxes For Field Studies in Fertilized Plots at Cerrado strictu sensu Sites in IBGE

Conclusions Addition of fertilizers increases the fraction of available organic carbon that is respired by the microbial community at both the and cm soil depths, The presence of fertilizers significantly changes the microbial community in the field and might offer an explanation for the difference observed with the CO 2 fluxes. Also the fast decrease in the respiration rate observed during the first days in the jars corresponds to the rapid change in microbial community observed within 10 days in the field. P has the strongest effect on the CO 2 fluxes at 0-10 cm, increasing by almost 1% the CO 2 respired from TOC, while N seems to increase the utilization at Both CO uptake and deposition velocity of CO are enhanced in the presence of P.

Cerrado

PROCESSES DRIVING CO 2 and CO EXCHANGE IN AGROECOSYSTEMS microbial recycling degradation root turnover groundwater loss litter CO 2 CO microbial consumption photosynthesis runoff abiotic production N,P,K respiration