UTL Repository >
ISA - Instituto Superior de Agronomia >
DCA - Departamento de Ciências do Ambiente >
DCA - Artigos de Revistas >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10400.5/1457

Title: Decomposição de folhada de quatro espécies florestais no Norte de Portugal: taxa de decomposição e evolução da composição estrutural e do teor em nutrientes
Other Titles: Decomposition of litterfall from four forest species in Northern Portugal: decomposition rate, and structural components and nutrient dynamics
Authors: Madeira, Manuel
Martins, A.
Raimundo, F.
Carvalho, L.
Keywords: castanea sativa
pinus pinaster
pinus nigra
pseudotsuga menziesii
litterfall
decomposition
structural components
nutrient dynamics
Issue Date: Jan-2009
Publisher: Sociedade de Ciências Agrárias de Portugal
Citation: "Revista de Ciências Agrárias". ISSN 0871-018X. 32:1 (2009) 223-237
Abstract: Decomposition of senescent leaves of Castanea sativa (CS), and needles of Pinus pinaster (PP), Pinus nigra (PN) and Pseu- dotsuga menziesii (PM) was studied during 3.1 to 3.5 years through weight loss and nu- trient concentration evolution, using the litter bag technique, whereas the variation of chemical structural compounds was followed during 391 to 518 days. The highest contents of N were measured in PM and CS (respectively 14.5 and 12.1 g kg-1), which showed lower C/N ratio (39.0, 46.8) than PN and PP (122.2 and 147.7, respectively). Highest contents of Ca (9.1 g kg-1) and of alcohol and water soluble compounds (384 against 95 to 160 g kg-1 to other species) were measured in PM needles, which also showed the lowest contents of holocelulose (253 g kg-1 against about 500 g kg-1 in the other species). The lignin Klason/N ratio decreased according to PP>PN>PM>CS, (71.2, 58.3, 20.5 and 20.3 respectively), and the holocelulose/lignin ratio ranged from 0.9 (PM) to 1.9-2.1 in the other species. Annual decay rates, according to the negative exponential model, were ordered according to CS>PN>PM>PP (respectively -0.35, -0.27, -0.19 and -0.16), but with higher values during the first year for CS (-0.60) and PM (0.31). Soluble compounds and hemicelulose strongly decreased during the decomposition period, while lignin and cellulose amounts showed a low variability, mainly in PP and PM needles. Nutrient amounts decreased during the decomposition process, but remaining quantities for N (41 to 121 %) and P (33 to 104 %) were higher than those estimated for K, Ca and Mg (respectively 17 to 65%, 30 to 60 % and 18 to59%). A strong decreasing of C/N ratio was observed especially for PP and PN, where reached 53.2 and 47.1.
URI: http://hdl.handle.net/10400.5/1457
ISSN: 0871-018X
Appears in Collections:DCA - Artigos de Revistas

Files in This Item:

File Description SizeFormat
REP-M.Madeira-1-v32n1a21.pdf259.62 kBAdobe PDFView/Open
Statistics
FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpaceOrkut
Formato BibTex mendeley Endnote Logotipo do DeGóis 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

 
Estamos no RCAAP Governo Português separator Ministério da Educação e Ciência   Fundação para a Ciência e a Tecnologia

Financiado por:

POS_C UE