Soil Organic Matter Dynamics in Long-term Temperate Agroecosystems: Rotation and Nutrient Addition Effects

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http://hdl.handle.net/10138/236512

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Li , J , Hernandez-Ramirez , G , Kiani , M , Quideau , S , Smith , E G , Janzen , H , Larney , F J & Puurveen , D 2018 , ' Soil Organic Matter Dynamics in Long-term Temperate Agroecosystems: Rotation and Nutrient Addition Effects ' , Canadian Journal of Soil Science , vol. 98 , no. 2 , pp. 232-245 . https://doi.org/10.1139/CJSS-2017-0127

Title: Soil Organic Matter Dynamics in Long-term Temperate Agroecosystems: Rotation and Nutrient Addition Effects
Author: Li, Jichen; Hernandez-Ramirez, Guillermo; Kiani, Mina; Quideau, Sylvie; Smith, Elwin G.; Janzen, Henry; Larney, Francis J.; Puurveen, Dick
Contributor organization: Department of Agricultural Sciences
AgriChar research group
Date: 2018-06
Language: eng
Number of pages: 14
Belongs to series: Canadian Journal of Soil Science
ISSN: 0008-4271
DOI: https://doi.org/10.1139/CJSS-2017-0127
URI: http://hdl.handle.net/10138/236512
Abstract: Soil organic matter (SOM) is a major driver of key agroecosystem functions. Our objective was to examine the dynamics of organic matter in whole soil, particulate (POM; > 53 mu m size), and mineral-associated (MAOM) fractions under varying crop rotations and nutrient managements at two long-term experimental sites (Breton and Lethbridge). Soil samples were collected from simple (2 yr) and complex (5 or 6 yr) crop rotations at the 5 - 10 cm depth. We found associations between SOM pools versus microbial community and soil aggregation. Compared to cropped soils, an adjacent forest exhibited a significantly higher soil total organic carbon (TOC) and a shift in SOM fractions with substantially higher POM. However, the forest soil had the lowest microbial biomass C among all the assessed land use systems (P <0 .05), suggesting that other factors than the amount of labile SOM (i.e., POM-C) were controlling the microbial community. When contrasted to simple 2 yr rotations, the complex rotations including perennials and legumes significantly raised TOC and soil total nitrogen as well as the stable SOM fraction (i.e., MAOM-C and -N)consistently for both Breton and Lethbridge sites. Our findings highlight that varying land managements have profound feedbacks on soil quality as mediated by alterations in long-term SOM dynamics.
Subject: 4111 Agronomy
agroecosystem
microbial biomass
soil organic matter
aggregation
soil quality
415 Other agricultural sciences
agroecosystem
microbial biomass
soil organic matter
aggregation
soil quality
MICROBIAL BIOMASS
MANAGEMENT-SYSTEMS
CROP-ROTATION
CARBON SEQUESTRATION
NATIVE FORESTS
BOREAL FOREST
QUALITY
TILLAGE
MINERALIZATION
PARTICULATE
Peer reviewed: Yes
Rights: other
Usage restriction: openAccess
Self-archived version: acceptedVersion


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