Herbaceous layer development during spring does not deplete soil nitrogen in the Portuguese montado
发表在:Journal of Arid Envi 75(3) 231-238    于:2011

Biomass development of the herbaceous vegetation,Mediterranean ecosystems,Portuguese montado,Pasture,Plant and soil nitrogen pools,Root distribution and nutrient uptake,Soil moisture


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 0.20.1% in February and 0.410.2% inMay,while available soil N was lowest (52 mg g-1soil) in February but increased three-to-five fold in March and was >17.5 mg g-1soil 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 conte t. 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


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