RESUMO A presente pesquisa teve como objetivo avaliar a dinâmica da recuperação ambiental de pilhas de estéril de mineração de calcário por meio da análise da composição e estrutura fitossociológica da regeneração natural. O estudo foi conduzido em um empreendimento minerário localizado em Salto de Pirapora (SP), Brasil, com pilhas de estéril abandonadas desde 1994 e 2013, e um fragmento florestal nativo, totalizando três tratamentos. Em cada área, foram alocadas 12 parcelas de 10 × 10 m, onde todos os indivíduos arbustivo-arbóreos com altura acima de 1,30 m foram amostrados, identificados e avaliados quanto à composição e à estrutura fitossociológica. Foi constatada a ocorrência da regeneração natural nas pilhas de estéril com o aumento de indivíduos e espécies ao longo do tempo. Os resultados indicam que a vegetação presente nessas pilhas está em transição de floresta pioneira para um estágio sucessional mais avançado. Contudo, a Leucaena leucocephala estabeleceu-se mais expressivamente que as demais, inibindo o desenvolvimento de outras espécies. Por fim, sugerem-se ações de manejo para que a sucessão ecológica das pilhas de estéril não seja comprometida.

This study focused on downy mildew in hop caused by the pathogen Pseudoperonospora humuli. A systematic literature review was conducted using bibliometric analysis to explore trends in publishing, prominent research themes, and where research is being conducted on hop downy mildew. The databases Scopus, Web of Science, and ScienceDirect were used to identify publications spanning from 1928 to 2023. The analysis yielded 54 publications, with the most cited studies primarily focusing on disease management and host resistance. Additionally, these studies explored the genetic and pathogenic relationship between P. cubensis and P. humuli. A word co-occurrence map revealed that the main themes addressed in the publications included “hop”, “disease”, “downy”, “humuli”, “mildew”, and “Pseudoperonospora”. Notably, there was a particular emphasis on subtopics such as disease management, the disease reaction of hop cultivars, and the influence of weather factors on hop downy mildew. Notably, there was limited knowledge about the disease in regions with tropical climates. This study provides valuable information that can support and guide future research endeavors concerning downy mildew in hop cultivation.

The importance of stemflow to hydrology and biogeochemistry in forest ecosystems is highlighted by the growing interest of the scientific community since the 1970s. This paper summarizes the main contributions of stemflow (SF) studies from recent years through a systematic review of the literature, including 375 scientific articles published between 2006 and 2019. Shrub SF has shown superior efficiency (11.1%) compared to tree species (3.6%). Branches, bark texture and composition, branch and leaf saturation capacity, and wind intensity were identified as factors that significantly influence SF. However, despite the increasing number of publications on the subject, most of them focus on semi-arid regions of Asia, particularly of China, and temperate regions. Thus, there is still a lack of knowledge about the role of the different species in the biogeochemical cycle concerning the SF in tropical and semi-equatorial regions.