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Bibliographic Details
Main Author:	Milton Marques Fernandes
Format:	Artículo científico
Language:	pt
Published:	Universidade Federal de Lavras 2008
Subjects:	Agrociencias solos florestais agregados do solo carbono orgânico do solo Qualidade da serapilheira
Online Access:	https://www.redalyc.org/articulo.oa?id=74414106
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Matéria orgânica e agregação de um planossolo sob diferentes coberturas florestais Milton Marques Fernandes Julia Kishida Bochner Fabiano de Carvalho Balieiro Ingrid Kely da Silva Santana Marcos Gervasio Pereira Agrociencias solos florestais agregados do solo carbono orgânico do solo Qualidade da serapilheira A qualidade da serapilheira pode alterar a agregação do solo, modificando a dinâmica de transformação e alocação docarbono (C) do solo em diferentes compartimentos. Avaliou-se neste estudo, a estabilidade de agregados e sua relação com característicasquímicas da serapilheira, com o carbono orgânico e a fração leve livre da matéria orgânica, sob três diferentes tipos de cobertura vegetalfloresta secundária (FS) e plantios de Mimosa Caesalpinaefolia (PM) e Carapa guianenses (PA) com posterior regeneração natural.Amostras de serapilheira foram caracterizadas quanto aos teores de polifenóis, lignina, suberina, tanino, holocelulose e relação C/N.Coletaram-se amostras de terra em duas profundidades (0-10 e 10-20 cm) para estimativa da agregação através da análise do diâmetromédio ponderado (DMP), diâmetro médio geométrico (DMG) e índice de estabilidade dos agregados (IEA). Subamostras das mesmasprofundidades foram ainda caracterizadas quanto aos teores de C e da fração leve livre (FLL). Os maiores teores de suberina epolifenóis da serapilheira, encontrados nas áreas FS e PM, reduziram a velocidade de decomposição dos resíduos no solo o queacarretou maiores teores da FLL em ambas as coberturas. Esses compostos contribuíram para a estabilização do C à fase mineral, poisos maiores teores de C foram encontrados nessas áreas. Essa afirmativa é confirmada pelos valores de DMP, DMG e IEA entre asáreas, que são maiores para as coberturas PM e FS. Os teores de polifenóis e suberina foram determinantes na compartimentação doC e agregação do solo das áreas de FS e PM 2008 artículo científico 0104-7760 https://www.redalyc.org/articulo.oa?id=74414106 pt http://www.redalyc.org/revista.oa?id=744 CERNE application/pdf Universidade Federal de Lavras CERNE (Brasil) Num.1 Vol.14

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* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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