TAILIEUCHUNG - Báo cáo lâm nghiệp: "Seasonal ionic exchange in two-layer canopies and total deposition in a subtropical evergreen mixed forest in central-south China"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Seasonal ionic exchange in two-layer canopies and total deposition in a subtropical evergreen mixed forest in central-south China. | Ann. For. Sci. 63 2006 887-896 INRA EDP Sciences 2006 DOI forest 2006072 887 Original article Seasonal ionic exchange in two-layer canopies and total deposition in a subtropical evergreen mixed forest in central-south China Gong ZHANGa b Guang Ming ZENGa Yi Min JlANGa b Guo He HUANGa Jia Mei YAOc Ren Jun XlANGd Xi Lin ZHANGa a College of Environmental Science and Engineering Hunan University Hunan province Changsha 410082 China b Hunan Environmental Protection Bureau Hunan province Changsha 410082 China cXiangya Hospital Central-south University Hunan province Changsha 410083 China d Hunan Research Academy of Environmental Sciences Changsha 410004 China Received 20 November 2005 accepted 9 March 2006 Abstract - About 15 and 9 of rainfall were intercepted by the top- and sub-canopy layer respectively. Although seasonal base cations concentrations in the sub-throughfall were higher than those in throughfall the calculated base cations leached from the sub-canopy was significantly low relative to that in the top-canopy. The uptakes of H and NH in the top-canopy were significantly higher than the sub-canopy suggesting that the acidity buffering processes mainly took place in the top-canopy. Annual mean dry deposition of Ca2 accounted for of its annual total deposition which was higher than that of Mg2 and K . The annual dry deposition of NH amounted to of its annual total deposition. The annual total deposition of base cations was similar to the total deposition of inorganic nitrogen NHỊ-N NO--N which were and of annual total deposition of all ions respectively. base cations nitrogen throughfall total deposition forest Résumé - Échanges ioniques saisonniers dans deux strates de la canopée et dépôts atmosphériques totaux dans une forêt mixte sempervirente sub-tropicale dans la partie centrale du sud de la Chine. Les strates supérieures et inférieures de la canopée ont intercepté respectivement environ 15 et 9 des eaux de pluie. Même

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