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Studies of Quantitative Relationships Among Dendrometric Variables and Carbon Contents for Native Mimosa scabrella Stands in the Curitiba Metropolitan Region PFB - Pesquisa Florestal Brasileira
Machado, Sebastião do Amaral; Urbano, Edilson; Jarschel, Barbara; Teo, Saulo Jorge; Figura, Marco Aurélio; Silva, Luis César Rodrigues da.
This research aimed to determine dry weights and carbon contents by age, and by compartment of Mimosa scabrella trees, their correlations with other measured tree variables. The data for this research work came from 190 trees located in several counties of the Curitiba metropolitan region. Total height, crow height, stem height, DBH and crow diameter were measured of each one of the 190 trees. Every sample tree was felled down and sectioned in the following components: stem, thick branches (diameter ≥ 4 cm), thin branches (diameter < 4 cm), foliage, and dead branches. The green weigth of each tree component was weighted in the field. Small sub samples of each tree component were also weighted in the field and brought to the laboratory for oven dry. Thus...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Green weight; Dry weight; Carbon content; Mimosa scabrella Peso verde; Peso seco; Teor de carbono; Bracatingais.
Ano: 2011 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/213
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Humic substances and its distribution in coffee crop under cover crops and weed control methods Scientia Agricola
Martins,Bruno Henrique; Araujo-Junior,Cezar Francisco; Miyazawa,Mario; Vieira,Karen Mayara.
ABSTRACT Humic substances (HS) comprise the passive element in soil organic matter (SOM), and represent one of the soil carbon pools which may be altered by different cover crops and weed control methods. This study aimed to assess HS distribution and characteristics in an experimental coffee crop area subjected to cover crops and cultural, mechanical, and chemical weed control. The study was carried out at Londrina, in the state of Paraná, southern Brazil (23°21’30” S; 51°10’17” W). In 2008, seven weed control/cover crops were established in a randomized block design between two coffee rows as the main-plot factor per plot and soil sampling depths (0-10 cm, 10-20 cm, 20-30 cm and 30-40 cm) as a split-plot. HS were extracted through alkaline and acid...
Tipo: Info:eu-repo/semantics/article Palavras-chave: UV-Vis spectroscopy; Conservation agriculture; Soil organic matter; Carbon content; Chemical fractionating.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000400371
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