RivestCogliastroBradleyEtAl2010

Référence

Rivest, D., Cogliastro, A., Bradley, R.L. and Olivier, A. (2010) Intercropping hybrid poplar with soybean increases soil microbial biomass, mineral N supply and tree growth. Agroforestry Systems, 80(1):33-40. (Scopus )

Résumé

We hypothesized that tree-based intercropping in southwestern Quebec, Canada, would stimulate soil microbial activity and increase soil nutrient supply, thereby benefiting the growth of trees. Our experimental design comprised alternating rows of hybrid poplar (Populus nigra L. × P. maximowiczii A. Henry) and high-value hardwood species spaced 8 m apart, between which two alley treatments were applied 5-6 years after planting the trees. The first alley treatment consisted of a fertilized soybean (Glycine max (L.) Merr.) intercrop grown over two consecutive years, while the second consisted of repeatedly harrowing to minimize vegetation in the alley. Tree rows were mulched with a 1.5 m wide polythene mulch. Microbial respiration and biomass, and mineral N concentrations and mineralization rates were measured on five or six dates at 0, 2 and 5 m from hybrid poplar rows. On some of the sampling dates, we found significantly higher soil microbial biomass, mineral N concentrations and nitrification rates, and a significantly lower microbial metabolic quotient (qCO2), in the soybean intercropping than in the harrowing treatment. Over the 2 year period, hybrid poplar biomass increment and N response efficiency (NRE) were significantly higher (51 and 47%, respectively) in the intercropping than in the harrowing treatment. Microbial biomass and mineral N supply were significantly lower beneath the polyethylene mulch than in the alleys, and we posit that this may stimulate the growth of tree roots into the alley. We conclude that soybean intercropping improves nutrient turnover and supply for hybrid poplar trees, thereby increasing the land equivalent ratio (LER). © 2010 Springer Science+Business Media B.V.

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@ARTICLE { RivestCogliastroBradleyEtAl2010,
    AUTHOR = { Rivest, D. and Cogliastro, A. and Bradley, R.L. and Olivier, A. },
    TITLE = { Intercropping hybrid poplar with soybean increases soil microbial biomass, mineral N supply and tree growth },
    JOURNAL = { Agroforestry Systems },
    YEAR = { 2010 },
    VOLUME = { 80 },
    PAGES = { 33-40 },
    NUMBER = { 1 },
    __MARKEDENTRY = { [Luc:6] },
    ABSTRACT = { We hypothesized that tree-based intercropping in southwestern Quebec, Canada, would stimulate soil microbial activity and increase soil nutrient supply, thereby benefiting the growth of trees. Our experimental design comprised alternating rows of hybrid poplar (Populus nigra L. × P. maximowiczii A. Henry) and high-value hardwood species spaced 8 m apart, between which two alley treatments were applied 5-6 years after planting the trees. The first alley treatment consisted of a fertilized soybean (Glycine max (L.) Merr.) intercrop grown over two consecutive years, while the second consisted of repeatedly harrowing to minimize vegetation in the alley. Tree rows were mulched with a 1.5 m wide polythene mulch. Microbial respiration and biomass, and mineral N concentrations and mineralization rates were measured on five or six dates at 0, 2 and 5 m from hybrid poplar rows. On some of the sampling dates, we found significantly higher soil microbial biomass, mineral N concentrations and nitrification rates, and a significantly lower microbial metabolic quotient (qCO2), in the soybean intercropping than in the harrowing treatment. Over the 2 year period, hybrid poplar biomass increment and N response efficiency (NRE) were significantly higher (51 and 47%, respectively) in the intercropping than in the harrowing treatment. Microbial biomass and mineral N supply were significantly lower beneath the polyethylene mulch than in the alleys, and we posit that this may stimulate the growth of tree roots into the alley. We conclude that soybean intercropping improves nutrient turnover and supply for hybrid poplar trees, thereby increasing the land equivalent ratio (LER). © 2010 Springer Science+Business Media B.V. },
    COMMENT = { Cited By (since 1996):5 Export Date: 14 April 2014 Source: Scopus CODEN: AGSYE },
    ISSN = { 01674366 (ISSN) },
    KEYWORDS = { Glycine max (L.) Merr., Metabolic quotient, Microbial biomass C, N response efficiency, Soil N availability, Tree-based intercropping, biomass, dicotyledon, growth rate, intercropping, metabolism, microbial activity, microbial community, mineralization, mulch, nitrification, nitrogen, nutrient, soil microorganism, soil nutrient, soybean, Canada, Quebec [Canada], Glycine max, Populus, Populus nigra },
    OWNER = { Luc },
    TIMESTAMP = { 2014.04.14 },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-77955549971&partnerID=40&md5=e9ddcb9c589127811c99f7ccc80ee3d9 },
}

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