Journal of Food, Agriculture and Environment
Vol 12,
Issue 2,2014
Online ISSN: 1459-0263
Print ISSN: 1459-0255
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Changes in soil respiration due to long-term application of organic and mineral fertilizers
Author(s):
Yunfa Qiao 1 *,
Xiaozeng Han 1, Lucas C. R. Silva 2, Shujie Miao 2Recieved Date: 2014-01-20, Accepted Date: 2014-04-18
Abstract:Amongst the most important components of the global carbon cycle, soil atmosphere interactions in general and soil respiration in particular, are the least understood. In the present study, we aimed to investigate the effects of different fertilization systems on soil respiration. We used an experimental design with five different treatments: Chemical fertilizer plus organic manure (NPK+OM), nitrogen, phosphorus and potassium (NPK), nitrogen and phosphorus only (NP), nitrogen and potassium only (NK), and no fertilizer as a control (CK). Changes in soil respiration were measured using the static chamber method and gas chromatography. Our results show highly significant changes in soil respiration among the treatments: NPK+OM > NPK > NP > NK > CK, with total carbon fluxes ranging from 29-302, 25-238, 25-185, 24-160 and 20-129 mg C m-2 h-1, respectively. We also observed an increasingly higher contribution of rhizosphere respiration to total carbon flux among the five treatments and an ascending order of NPK+OM > NPK > NP > NK > CK. Rhizosphere respiration and aerial biomass carbon of the five fertilizer treatments demonstrated the highest rate from pod stage to seed-filling stage.
Keywords:Fertilizer,
organic manure, rhizosphere respiration, soil respiration, soybeanJournal: Journal of Food, Agriculture and Environment
Year: 2014
Volume: 12
Issue: 2
Category: Environment
Pages: 873-878
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