NDLI: How much nitrogen is fixed by biological symbiosis in tropical dry forests? 1. Trees and shrubs

Content Provider	Springer Nature Link
Author	Souza, Leonardo Queiroz Freitas, Ana Dolores Santiago Sampaio, Everardo Valadares de Sá Barretto Moura, Patrícia Maia Menezes, Rômulo Simões Cezar
Copyright Year	2012
Abstract	Despite the recognized importance of the process, estimates of the amount of nitrogen fixed by biological symbiosis in tropical dry forests are almost nonexistent. We estimated the nitrogen fixed annually by the leaves of trees and shrubs at sites regenerating for 16 and 38 years and in an old-growth dry forest using 15N abundance methodology. The total leaf biomass (1,824–3,036 kg ha−1) and nitrogen contents (62–90 kg ha−1) did not differ among the areas. In all of the areas, most of the leaf biomass belonged to legume plants, but the proportion of the N2-fixing legumes decreased with increasing regeneration time. In the 16-year regenerating area, almost all of the N was in the leaves of the N-fixing Mimosa tenuiflora plants, but fixation was absent or very low as it was in the N-fixing species present in the 38-year regenerating area. In the old-growth Caatinga, all of the N-fixing species (M. tenuiflora, Piptadenia stipulacea and Anadenanthera colubrina) had large proportions (47–62 %) of their N derived from atmospheric N2, but the amount of fixed N (6 kg ha−1) was a small proportion of the total leaf N because these plant species were a small part of the vegetation. The total input of biologically fixed N to the old-growth forest was similar in magnitude to an estimate made for a humid tropical forest in Amazonia.
Starting Page	171
Ending Page	179
Page Count	9
File Format	PDF
ISSN	13851314
Journal	Nutrient Cycling in Agroecosystems
Volume Number	94
Issue Number	2-3
e-ISSN	15730867
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-09-29
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Caatinga N-15, Northeast Brazil Symbiotically fixed N Tropical dry forest Agriculture
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science

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