Pekka Nygren
Pekka Nygren
Finnish Society of Forest Science
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Components of functional-structural tree models
R Sievänen, E Nikinmaa, P Nygren, H Ozier-Lafontaine, J Perttunen, ...
Annals of forest science 57 (5), 399-412, 2000
2432000
Transfer of N fixed by a legume tree to the associated grass in a tropical silvopastoral system
J Sierra, P Nygren
Soil Biology and Biochemistry 38 (7), 1893-1903, 2006
902006
Coarse root architecture of three boreal tree species growing in mixed stands
T Kalliokoski, P Nygren, R Sievänen
Silva Fennica 42, https://doi.org/10.14214/sf.252, 2008
872008
Production and turnover of N2 fixing nodules in relation to foliage development in periodically pruned Erythrina poeppigiana (Leguminosae) trees
P Nygren, C Ramírez
Forest Ecology and Management 73 (1-3), 59-73, 1995
751995
Transfer of nitrogen from a tropical legume tree to an associated fodder grass via root exudation and common mycelial networks
R Jalonen, P Nygren, J Sierra
Plant, cell & environment 32 (10), 1366-1376, 2009
692009
Tree species diversity and forest structure in relation to microtopography in a tropical freshwater swamp forest in French Guiana
P Koponen, P Nygren, D Sabatier, A Rousteau, E Saur
Plant Ecology 173 (1), 17-32, 2004
612004
The role of nitrogen fixation and nutrient supply in some agroforestry systems of the Americas
DCL Kass, R Sylvester-Bradley, P Nygren
Soil Biology and Biochemistry 29 (5-6), 775-785, 1997
611997
Belowground interspecific competition in mixed boreal forests: fine root and ectomycorrhiza characteristics along stand developmental stage and soil fertility gradients
T Kalliokoski, T Pennanen, P Nygren, R Sievänen, HS Helmisaari
Plant and Soil 330 (1-2), 73-89, 2010
592010
Internal circulation of carbon within a tree
P Hari, P Nygren, E Korpilahti
Canadian Journal of Forest Research 21 (4), 514-515, 1991
551991
A fractal root model applied for estimating the root biomass and architecture in two tropical legume tree species
E Salas, H Ozier-Lafontaine, P Nygren
Annals of Forest Science 61 (4), 337-345, 2004
532004
Application of the pipe model theory to non-destructive estimation of leaf biomass and leaf area of pruned agroforestry trees
P Nygren, S Rebottaro, R Chavarria
Agroforestry systems 23 (1), 63-77, 1993
481993
Influence of forage harvesting regimes on dynamics of biological dinitrogen fixation of a tropical woody legume
P Nygren, P Cruz, AM Domenach, V Vaillant, J Sierra
Tree Physiology 20 (1), 41-48, 2000
462000
Effects of potassium deficiency and simulated acid rain, alone and in combination, on the ultrastructure of Scots pine needles
T Holopainen, P Nygren
Canadian Journal of Forest Research 19 (11), 1402-1411, 1989
451989
Nodulation and dinitrogen fixation of legume trees in a tropical freshwater swamp forest in French Guiana
P Koponen, P Nygren, AM Domenach, C Le Roux, E Saur, JC Roggy
Journal of Tropical Ecology 19 (6), 655-666, 2003
422003
Symbiotic dinitrogen fixation by trees: an underestimated resource in agroforestry systems?
P Nygren, MP Fernández, JM Harmand, HA Leblanc
Nutrient cycling in agroecosystems 94 (2-3), 123-160, 2012
402012
Nitrogen transfer from a legume tree to the associated grass estimated by the isotopic signature of tree root exudates: a comparison of the 15N leaf feeding and natural 15N …
J Sierra, D Daudin, AM Domenach, P Nygren, L Desfontaines
European Journal of Agronomy 27 (2-4), 178-186, 2007
402007
Dynamics of nonstructural carbohydrates and biomass yield in a fodder legume tree at different harvest intensities
H Garcia, P Nygren, L Desfontaines
Tree physiology 21 (8), 523-531, 2001
402001
Nitrogen-fixation dynamics in a cut-and-carry silvopastoral system in the subhumid conditions of Guadeloupe, French Antilles
M Dulormne, J Sierra, P Nygren, P Cruz
Agroforestry Systems 59 (2), 121-129, 2003
392003
Biomass allocation and nodulation of Gliricidia sepium under two cut-and-carry forage production regimes
P Nygren, P Cruz
Agroforestry Systems 41 (3), 277-292, 1998
381998
Implications of the Kyoto Protocol for tropical forest management and land use: prospects and pitfalls
J Koskela, P Nygren, F Berninger, O Luukkanen
University of Helsinki (Finland) Tropical Silviculture Unit, 2000
342000
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Artikkelit 1–20