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Soil dissolved organic carbon responses to sugarcane straw removal

Gmach, Maria and Kaiser, Klaus and Cherubin, Mauricio Roberto and Cerri, Carlos Eduardo Pellegrino and Lisboa, Izaias Pinheiro and Vasconcelos, Ana Luisa Soares and Siqueira-Neto, Marcos (2021). Soil dissolved organic carbon responses to sugarcane straw removal. Soil Use and Management. 37 , 126-137
[Research article]

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Abstract

Global demand for bioenergy increases interest in biomass-derived fuels, as ethanol from sugarcane straw. However, straw is the main carbon source to soil and its removal reduces C input, affecting active fractions (dissolved organic carbon, DOC) and C storage. To quantify the effects of straw removal on DOC and C stocks, we built lysimeter system using soil (Rhodic Kandiudox) from sugarcane field. We evaluated four soil depths (1, 20, 50 and 100 cm) and four straw removal rates: no removal NR, medium MR, high HR and total TR, leaving 12, 6, 3 and 0 Mg/ha on the soil surface, respectively. After rainfall, drainage water was collected and analysed for DOC content. Soil C stocks were determined after the 17-month. Total DOC released at 1-cm depth amounted to 606, 500, 441 and 157 kg/ha in NR, MR, HR and TR, respectively. Net-DOC suggests straw as the main source of DOC. Most of DOC in NR (50%) was retained within the 1-20 cm layer, resulting in higher C stock (10 Mg/ha) in the topsoil. In HR and MR, DOC retention was higher within 20-50 cm, suggesting differences in DOC composition. DOC in TR was 40% higher at 20 cm than at 1 cm, indicating C losses from topsoil. Low concentrations of DOC were found at 100-cm depth, but representing 30% in TR. Straw removal for bioenergy production is sustainable, but we should leave at least 3 Mg/ha of straw to ensure DOC production and soil C storage, taking account the DOC contribution to key soil functions.

Authors/Creators:Gmach, Maria and Kaiser, Klaus and Cherubin, Mauricio Roberto and Cerri, Carlos Eduardo Pellegrino and Lisboa, Izaias Pinheiro and Vasconcelos, Ana Luisa Soares and Siqueira-Neto, Marcos
Title:Soil dissolved organic carbon responses to sugarcane straw removal
Series Name/Journal:Soil Use and Management
Year of publishing :2021
Volume:37
Page range:126-137
Number of Pages:12
Publisher:WILEY
ISSN:0266-0032
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Keywords:crop management, soil carbon storage, soil organic matter, tropical soils
URN:NBN:urn:nbn:se:slu:epsilon-p-108701
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-108701
Additional ID:
Type of IDID
DOI10.1111/sum.12663
Web of Science (WoS)000583288400001
ID Code:25501
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
Deposited By: SLUpub Connector
Deposited On:24 Sep 2021 12:25
Metadata Last Modified:24 Sep 2021 12:31

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