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Herbaceous layer development during spring does not deplete soil nitrogen in the Portuguese montado
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出 版 社:Journal of Arid Environments  
发表时间:2011  
台  站: 鼎湖山森林生态系统定位研究站  
作  者:李跃林(4)  
点 击 率:351696
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关 键 字(英文):Biomass development of the herbaceous,vegetation  
摘  要(英文):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±52.7gm-2) and lowest (123.2±89.5gm-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% in May,while available soil N was lowest (5±2μgg-1 soil)in February but increased three-to-five fold in March and was >17.5μgg-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.  
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李跃林4-2011-Journal of Arid Environments-Herbaceous layer development during spring does not deplete soil nitrogen in the Portuguese montado.pdf
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