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1. Verfasser:	H. A. Acciaresi
Format:	Artículo científico
Sprache:	es
Veröffentlicht:	Asociación Española de Ecología Terrestre 2012
Schlagworte:	Estudios Ambientales RYT agresividad Potencial agua contenido relativo de agua
Online-Zugang:	https://www.redalyc.org/articulo.oa?id=54024838015
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Competencia entre Zea mays y Sorghum halepense por agua edáfica y su incidencia en el intercambio gaseoso foliar H. A. Acciaresi M. S. Zuluaga M. E. Yanniccari J. J. Guiamet Estudios Ambientales RYT agresividad Potencial agua contenido relativo de agua La alta estabilidad productiva en ambientes con restricciones hídricas se ha vinculado a la habilidad de conservación del agua por parte de loscultivos. Sin embargo, diferentes especies de malezas, bajo competencia hídrica realizan un uso ineficiente de la misma. Con el objetivo de determinarla estrategia de consumo de agua que poseen Zea mays y Sorghum halepense bajo dos situaciones de disponibilidad hídrica edáfica y trabajandocon plantas en contenedores, se estudió la evolución de los potenciales hídricos del suelo (ψs) y de la hoja (ψf), el contenido relativo de agua (CRA)y el intercambio gaseoso foliar durante el período crítico de competencia del cultivo. Además, se calculó la eficiencia en el uso del agua, la complementariedadde recursos por medio de la productividad relativa total (RYT) y la habilidad competitiva a través del índice de agresividad (AGR). Seobservó que S.halepense realizó una absorción continua de agua, alcanzando un menor ψf respecto de los híbridos de Z.mays. S.halepensemantuvo el CRA por encima del 90%, alcanzado el 70% sólo en competencia con baja disponibilidad hídrica. En Z.mays, el CRA disminuyó a valoresde 70% en ambos niveles hídricos estudiados, manteniendo S.halepense un activo intercambio gaseoso foliar. Los híbridos de Z.mays presentaronuna menor habilidad competitiva que S.halepense para ambos niveles de competencia debido a la estrategia conservadora de la humedad quemostró el cultivo. El uso del agua realizado por la maleza podría ser una de las causas de la mayor agresividad de S.halepense bajo las condicionesestudio. 2012 artículo científico 1132-6344 https://www.redalyc.org/articulo.oa?id=54024838015 es http://www.redalyc.org/revista.oa?id=540 Ecosistemas application/pdf Asociación Española de Ecología Terrestre Ecosistemas (España) Num.3 Vol.21

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @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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