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Cover crops enhance soil organic matter, carbon dynamics and microbiological function in a vineyard agroecosystem

Permanent URL:
http://handle.nal.usda.gov/10113/20306
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Abstract:
Impacts of soil tillage and cover crops on soil carbon (C) dynamics and microbiological function were investigated in a vineyard grown in California's mediterranean climate. We (1) compared soil organic matter (SOM), C dynamics and microbiological activity of two cover crops [Trios 102 (Triticale x Triosecale) ('Trios'), Merced Rye (Secale cereale) ('Rye')] with cultivation ('Cultivation') and (2) evaluated seasonal effects of soil temperature, water content, and precipitation on soil C dynamics (0-15cm depth). From treatments established in November 2001, soils were sampled every 2-3 weeks from November 2005 to November 2006. Gravimetric water content (GWC) reflected winter and spring rainfall. Soil temperature did not differ among treatments, reflecting typical seasonal patterns. Few differences in C dynamics between cover crops existed, but microbial biomass C (MBC), dissolved organic C (DOC), and carbon dioxide (CO₂) efflux in 'Trios' and 'Rye' were consistently 1.5-4-fold greater than 'Cultivation'. Cover crops were more effective at adding soil C than 'Cultivation'. Seasonal patterns in DOC, and CO₂ efflux reflected changes in soil water content, but MBC displayed no temporal response. Decreases in DOC and potential microbial respiration (RESPmic) (i.e., microbially available C) also corresponded to or were preceded by increases in CO₂ efflux, suggesting that DOC provided C for microbial respiration. Despite similar MBC, DOC, RESPmic, annual CO₂ efflux and aboveground C content between the two cover crops, greater aboveground net primary productivity and SOM in 'Trios' indicated that 'Trios' provided more soil C than 'Rye'.
Author(s):
Steenwerth, Kerri , Belina, K.M.
Subject(s):
cover crops , vineyard soils , vineyards , soil organic matter , soil microorganisms , agroecosystems , soil organic carbon , soil nutrient dynamics , tillage , Mediterranean climate , triticale , rye , Secale cereale , seasonal variation , soil temperature , soil water , water content , precipitation , biomass , rain , dissolved organic carbon , carbon dioxide , gas emissions , microbial activity , growing season , California
Format:
p. 359-369.
Note:
Includes references
Source:
Applied soil ecology 2008 Oct., v. 40, no. 2
Language:
English
Publisher:
[Amsterdam]: Elsevier Science
Year:
2008
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.