03125nab a2200301 i 4500003000900000005001700009008004100026040001800067072001400085072000900099100003100108100003700139100003000176100003100206100003500237100003600272245010100308500007500409520197600484650002002460650002502480650000902505650001502514773018602529856008102715942000802796999001902804BR-BrBNA20260319170941.0260319b2017    bl.ar|pooa||| 00| 0 por |  aBR-BrBNAbpor  aP33b3840  b3820  aCouto, Wanderson Henrique   aAnjos, Lúcia Helena Cunha dos   aPereira, Marcos Gervasio   aGuareschi, Roni Fernandes   aAssunção, Shirlei Almeida   aWadt, Paulo Guilherme Salvador   aCarbono, Nitrogênio, Abundância Natural de Δ13C e Δ15N do Solo sob Sistemas Agroflorestais  aPublicação on-line; 33 ref.; 1 table; 4 illus.; Summaries (En, Pt)  a

RESUMO

O objetivo deste trabalho foi avaliar alterações nos teores de C e N e abundância natural de
δ13C e δ15N de um Cambissolo Háplico Tb distrófico em uma área com sistema agroflorestal (SAF).
Em cada área de estudo foram coletadas amostras de solo, em 8 profundidades de 0,0–1,0 m.
O delineamento experimental utilizado foi o inteiramente casualizado, em esquema de parcelas
subdivididas 2 × 8 (2 áreas florestais e 8 profundidades), com três repetições. Com exceção da
camada superficial do solo (0,0-0,10), a área de SAF está preservando os teores de C e aumentando
os teores de N (0,2-1,0) em relação à mata nativa. Ambas as áreas avaliadas apresentaram sinais
de abundância natural de δ13C referente a plantas do ciclo fotossintético C3, e a área de mata
nativa apresentou nas camadas superficiais (0,0-0,20) maiores valores de δ15N, demonstrando
maior decomposição da matéria orgânica.

Palavras-chave: reflorestamento, matéria orgânica do solo, Cambissolo.


Carbon, Nitrogen, and Natural Abundance Of Δ13C and Δ15N of Soils Under Agroforestry Systems

ABSTRACT

The aim of this study was to evaluate changes in C and N levels and in the natural abundance
of δ15N and δ13C of a Inceptisol in an agroforestry system (AFS). Soil samples were collected
from eight depth levels from 0.0-1.0 m in each studied area. The experiment was carried out in a
completely randomized 2 × 8 (2 forest areas and 8 depths) split-plot design with three replications.
Except for the topsoil (0.0-0.10), the area of this AFS has preserved content of C and increased
level of N (0.2-1.0) compared to the Forest. Both areas showed signs of natural abundance
of δ13C in plants with C3 photosynthetic pathway, and the forest area presented higher values
of δ15N in the superficial layers (0.0-0.20), indicating greater decomposition of organic matter.

Keywords: reforestation, soil organic matter, Inceptisol.  aREFLORESTAMENTO  aMATÉRIA ORGÂNICA  aSOLO  aCAMBISSOLO0 029299347945dRio de Janeiro-RJ Instituto de Florestas - UFRRJ 1994o2025-0444tFloresta e Ambiente (Brazil)x1415-0980  /  ISSN 2179-8087 0nlinegv. 24 p. 1-8; (2017)wBR2026000242  uhttps://www.scielo.br/j/floram/a/WRbDJwYnfq9RGvpJdXvM8Jm/?format=pdf&lang=pt  cANA  c340478d340478