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|Title: ||Herbaceous layer development during spring does not deplete soil nitrogen in the Portuguese montado|
|Authors: ||Otieno, D.O.|
|Keywords: ||Biomass development of the herbaceous vegetation|
Plant and soil nitrogen pools
Root distribution and nutrient uptake
|Issue Date: ||26-Nov-2010|
|Citation: ||D.O. Otieno, H. Mirzaei, M.Z. Hussain, Y.L. Li, M.W.T. Schmidt, M. Wartinger , E. Jung, N. Ribeiro, J.S. Pereira, J. Tenhunen, (2011). Herbaceous layer development during spring does not deplete soil nitrogen. Journal of Arid Environments 75: 231-238|
|Abstract: ||Nitrogen (N) content in the soil and in the herbaceous biomass were monitored during spring of 2004-2006 to determine how the herbaceous layer development influences soil N availability in the montado ecosystem of southern Portugal. Highest (246.6 ± 52.7 g m-2) and lowest (123.2 ± 89.5 g m-2) peak biomass occurred in 2006 and 2005 respectively. Total soilNwithin the top 20 cmsoil profile ranged between 0.2 0.1% in February and 0.41 0.2% inMay,while available soil N was lowest (5 ± 2 μg g-1soil) in February but increased three-to-five fold in March and was >17.5 μg g-1 soil at senescence in May.
Significant (p < 0.001) increase in total N in the aboveground pool occurred between February and May.
There was however, no decay in soil N content. Instead, the herbaceous vegetation enhanced soil N input and N retention in the ecosystem. Most of the herbaceous plants were annuals with large reserves of organic N at senescence, which returned to the soil as detritus. The herbaceous vegetation is a critical component of the montado that contributes to N recharge and cycling within the ecosystem.|
|Appears in Collections:||MED - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica|
FIT - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
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