منابع مشابه
Episodic death across species of desert shrubs.
Extreme events shape population and community trajectories. We report episodic mortality across common species of thousands of long-lived perennials individually tagged and monitored for 20 years in the Colorado Desert of California following severe regional drought. Demographic records from 1984 to 2004 show 15 years of virtual stasis in populations of adult shrubs and cacti, punctuated by a 5...
متن کاملFine root growth dynamics of four Mojave Desert shrubs as related to soil moisture and microsite
Water is generally considered to be the major limiting factor for perennial shrub growth in the Mojave Desert, USA. However, the responses of active fine roots to soil moisture and microsite differed among Ambrosia dumosa, Ephedra nevadensis, Larrea tridentata, and Lycium pallidum, suggesting differences in root foraging strategies. Ambrosia and Ephedra had a positive linear relationship betwee...
متن کاملEcophysiology of two Sonoran Desert evergreen shrubs during extreme drought
Recent drought across the desert Southwest US may strongly affect the physiological functioning of evergreen desert species that maintain leaves through these dry periods. In July 2002 we compared the ecophysiological performance of the open-canopied, small-leaved creosotebush (Larrea tridentata) to the dense-canopied, more broad-leaved jojoba (Simmondsia chinensis) growing on a ridge-top, east...
متن کاملElectrodiagnostic Evaluation of cervical root involvement among patients presenting with radicular pain: Short Communication
Cervical spine pain is one of the most common problems of the spine and upper limbs, which can be axial or radicular. The present study aimed to electrodiagnostically evaluate cervical root involvement among patients presenting with radicular pain. The population was selected using simple random sampling from patients complaining of cervical radicular pain and unilateral or bilateral upper ext...
متن کاملModerate irrigation intervals facilitate establishment of two desert shrubs in the Taklimakan Desert Highway Shelterbelt in China
BACKGROUND Water influences various physiological and ecological processes of plants in different ecosystems, especially in desert ecosystems. The purpose of this study is to investigate the response of physiological and morphological acclimation of two shrubs Haloxylon ammodendron and Calligonum mongolicunl to variations in irrigation intervals. METHODOLOGY/PRINCIPAL FINDINGS The irrigation ...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 1991
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.88.3.874