Fonsêca, Nathan Castro creator Meunier, Isabelle Maria Jacqueline creator Silva, Ana Carolina Borges Lins e creator text periodical abstract or summary bl. continuing eng ABSTRACT Necromass is a crucial component for the forest structure. However, there are few studies of necromass quantification in tropical rainforests and lack of efficient sampling methods. This research aimed at verifying the accuracy and effectiveness of sampling methods (Line-intersect sampling - LIS versus fixed area plots - FA) for the estimation of necromass in a tropical rainforest. The accuracy and efficiency of the methods were evaluated through descriptive statistics, paired t-test, ANOVA and relative efficiency. LIS method was more accurate and efficient, but it requires high sampling to meet sample error of 15%. Necromass at the forest fragment studied accounted for about 12.28% of the tree biomass. These findings show the importance of this compartment inclusion when quantifying carbon stocks in humid tropical forests, which acts as a true reservoir of carbon. Keywords: sampling, fixed area, fallen dead wood, transect. Publicação on-line; 34 ref.; 4 tables; 6 illus.; Summary (En) AMOSTRAGEM RESÍDUO ORGÂNICO MADEIRA Rio de Janeiro-RJ Instituto de Florestas - UFRRJ 1994 2025-0451 1415-0980 / ISSN 2179-8087 0nline BR2026000285 v. 26(3) p. 1-10; (2019) https://www.scielo.br/j/floram/a/XqDpKKH7TkvzyGMTwDVLZnN/?format=pdf&lang=en https://www.scielo.br/j/floram/a/XqDpKKH7TkvzyGMTwDVLZnN/?format=pdf&lang=en BR-BrBNA 260406 20260406090327.0 eng