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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

Journal Article

Phenology of five tree species of a tropical dry forest in Yucatan, Mexico: effects of environmental and physiological factors  [2010]

Valdez-Hernández, Mirna; Andrade, José Luis; Jackson, Paula C.; Rebolledo-Vieyra, Mario;

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In order to relate phenological responses of trees to environmental variables we recorded the phenological patterns and select morphological and physiological traits (wood density and water potentials) of five tree species (Acacia gaumeri, Apoplanesia paniculata, Bursera simaruba, Gymnopodium floribundum, and Diospyros cuneata) in the tropical dry deciduous forest of the National Park of Dzibilchaltún, Yucatan, Mexico, over a period of 2 years (2004 and 2005). We chose two sites: one close to a permanent water source, locally known as ‘cenote' (the CC site, ground water table was found at 2 m) and the other far from the cenote (FC site ground water table was at a depth of 10 m). Sites mainly differed in soil depth (FC site having greater soil depth) and soil nutrient characteristics (FC site more potassium, CC site more phosphorous). Our results indicated significant differences in phenology within species between sites and years, with leaf, flower and fruit production tending to be higher at the CC site and in the year 2004. Wood density and xylem water potentials were negatively related to each other, and midday water potentials were higher at the CC site. Differences in phenology found among years suggest that the timing of rainfall as well as the duration of periods without rain may play a more important role in phenology than total annual precipitation. Also differences inter-sites suggest a strong effect of site on tree phenology. Proximity to superf
icial bodies of water, such as cenotes, coupled with a greater concentration of available phosphorus in the soil may modify the effect of drought in this tropical dry deciduous forest.
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Plant and soil
ISSN : 0032-079X

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2013
Volume:
329
Issue:
1-2
Start Page:
155
End Page:
171
Publisher:
Dordrecht : Springer Netherlands
All titles:
"Phenology of five tree species of a tropical dry forest in Yucatan, Mexico: effects of environmental and physiological factors"@eng
Other:
"Includes references"
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Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2013
Volume:
329
Issue:
1-2
Start Page:
155
End Page:
171
Publisher:
Dordrecht : Springer Netherlands
All titles:
"Phenology of five tree species of a tropical dry forest in Yucatan, Mexico: effects of environmental and physiological factors"@eng
Other:
"Includes references"