ResumoA revegetação de áreas desmatadas de Mata Atlântica pode ser realizada com mudas de espécies florestais nativas inoculadas com fungos micorrízicos arbusculares (FMA). Este trabalho objetivou avaliar o efeito de diferentes substratos, na ausência/presença de inoculação com FMA, sobre o crescimento e conteúdo nutricional de mudas de Colubrina glandulosa Perkins. As mudas foram produzidas em tubetes em casa de vegetação. O delineamento experimental foi inteiramente casualizado, com 12 repetições/tratamento e oito tratamentos: T1 (20% esterco bovino + 80% terra), T2 (20% esterco bovino + 80% terra + FMA), T3 (20% esterco bovino + 60% terra + 20% areia), T4 (20% esterco bovino + 60% terra + 20% areia + FMA), T5 (20% esterco bovino + 60% terra + 20% vermiculita), T6 (20% esterco bovino + 60% terra + 20% vermiculita + FMA), T7 (20% esterco bovino + 60% terra + 10% areia + 10% vermiculita) e T8 (20% esterco bovino + 60% terra + 10% areia + 10% vermiculita + FMA). Aos 30, 65, 93 e 115 dias após a instalação do experimento, avaliou-se a altura (H) e diâmetro do coleto (DC). Aos 115 dias, avaliou-se a massa de matéria seca da parte aérea (MSPA) e raiz (MSR), razão MSPA/MSR, taxa de colonização micorrízica da raiz (%COLRAIZ), Índice de Qualidade de Dickson (IQD), conteúdo de nutrientes (N, P, K) na parte aérea e raiz, e eficiência de absorção de nutrientes (N, P, K). Concluiu-se que o T8 é o mais recomendado, pois proporcionou a produção de mudas com elevados valores para a maioria das variáveis de crescimento e nutrição analisadas. Palavras-chave: Fungos micorrízicos arbusculares; Mata Atlântica; recuperação de áreas degradadas. Abstract Effects of substrate and mycorrhizal inoculation on the production of seedlings of Colubrina glandulosa Perkins.Revegetation of deforested Atlantic Forest areas can be carried out with seedlings of native tree species inoculated with arbuscular mycorrhizal fungi (AMF). This study aimed to evaluate the effect of different substrates in the absence/presence of AMF inoculation on growth and nutritional content of Colubrina glandulosa Perkins seedlings. The seedlings were grown in plastic pots under greenhouse conditions. The experimental design was completely randomized with 12 repetitions/treatment and eight treatments: T1 (20% cattle manure + 80% soil horizon), T2 (20% cattle manure + 80% soil horizon + AMF), T3 (20% cattle manure + 80% soil horizon + 20% sand), T4 (20% cattle manure + 80% soil horizon + 20% sand + AMF), T5 (20% cattle manure + 60% soil horizon + 20% vermiculite), T6 (20% cattle manure + 60% soil horizon + 20% vermiculite + AMF), T7 (60% soil horizon A + 20% cattle manure + 10% sand + 10% vermiculite) e T8 (60% soil horizon A + 20% cattle manure + 10% sand + 10% vermiculite + AMF). At 30, 65, 93 and 115 days after the beginning of the experiment, we evaluated the height (H) and collar diameter (DC). At 115 days, we evaluated the dry matter of shoot (MSPA) and root (MSR), MSPA/MSR ratio, rate of roots colonization by mycorrhiza (% COLRAIZ), quality index of Dickson (IQ...

The aim of this work was to evaluate the influence of the conversion of forest systems to agricultural systems in the organic matter compartments, aggregation and soil chemical attributes, in the Atlantic Forest. The evaluated systems were: annual crop (ACr); perennial agriculture (PAg); pasture; and secondary forest early (SFES), medium (SFMS), and advanced stage (SFAS). Soil samples were collected at the layer of 0-5 cm depth and quantified the total organic carbon (TOC), C of humic substances, oxidizable C, granulometric fractions of soil organic matter (SOM), soil chemical attributes, soil aggregation and glomalin-related soil protein (GRSP-total and GRSP-easily extractable) in different aggregate classes. It was observed a reduction of the TOC, particulate organic carbon (POC), humic substances and oxidizable C in the PAg and ACr areas comparing to pasture and forest systems. Moreover, the pH values increased whereas P content decreased in comparison with SFAS. As for aggregation, the PAg and the ACr decreased by around 35% and 20% the mean weight diameter of aggregates, respectively, compared to the average values found in the forestry systems, and 34% and 45%, respectively in relation to pasture. In general, GRSP-total were reduced by agriculture. Thus, it appears that the agriculture which has been practiced is altering negatively the soil chemical, physical and biological attributes.

Urban organic waste has been gaining prominence in the composition of substrates, as it is a source of natural nutrients and a sustainable alternative to mitigate environmental impacts caused by improper waste disposal. The aim of this study was to characterize chemically and physically substrates based on organic waste and to evaluate the development of Colubrina glandulosa seedlings using composted urban tree pruning waste. Treatments consisted of different proportions of organic compost (CP), soil from the A horizon (SAH), aged manure (BM) and vermiculite, kept in tubes (Citropote®) with volume of 1.7 L. C/N ratio, water holding capacity (10 hPa), electrical conductivity, macroporosity, microporosity and total porosity of substrates before their use were determined. Substrate fertility analyses were carried out before and after seedling production. During the development of the seedlings, height (H) and stem diameter (SD) were measured at 60, 90 and 120 days. At 90 and 120 days, the seedlings were divided into shoots and roots to determine the dry mass of each compartment, Dickson quality index (DQI) and contents of nutrients (N, P, K, Ca and Mg). After the analysis of the results, it can be observed that the treatments with high proportions of CP had better physical characteristics, but also showed chemical limitation in the development of the seedlings. Treatments based on BM, SAH and lower proportion of CP had the highest average results for H, SD, H/SD ratio and DQI.

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