Filters: Tags: Proceedings RMRS-P-47: Shrubland dynamics, fire and water (X)
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Ceratoides lanata (Rydb.) J.T. Howell, common winterfat, is valued for its nutrient content and palatability to livestock; however, the subspecies Ceratoides lanata var. subspinosa (Rydb.) J.T. Howell, (‘subspinosa’) is considered unpalatable. Curiously, observations of ‘subspinosa’ revealed several populations in central New Mexico that were heavily grazed. Volatile terpene profiles are associated with differences in palatability in many plant species. To determine whether differences in volatile profiles between ‘subspinosa’ populations would correlate with apparent differences in palatability, plants from 13 populations of ‘subspinosa’ were collected. Volatile analysis of shoot samples identified 33 compounds....
Differences in anatomical characteristics of blackbrush (Coleogyne ramosissima Torr.) leaves were quantitatively investigated along an elevational gradient in Lee Canyon of the Spring Mountains in southern Nevada. Three elevational sites were selected: a lower blackbrush ecotone, a nearly monospecific stand in the middle of the gradient, and an upper blackbrush ecotone. Stomatal density was significantly greater and palisade parenchyma was significantly shorter in the lower ecotone compared to the upper ecotone. Vessel diameters and areas were significantly smaller, while vessel density was higher with increasing aridity. Blackbrush shrubs exhibited upper and lower elevational ecotypes at the anatomical level in...
Categories: Publication;
Types: Citation,
Conference Citation;
Tags: Coleogyne ramosissima Torr.,
Ecotones,
Lee Canyon,
Proceedings RMRS-P-47: Shrubland dynamics, fire and water,
Spring Mountains,
Soil responses to human trampling, biking, and off-road motor vehicle traffic were quantitatively investigated in a blackbrush (Coleogyne ramosissima Torr.) shrubland in Kyle Canyon of the Spring Mountains in southern Nevada. Soil compaction, bulk density, and temperature increased significantly, while soil moisture, organic matter, and percent pore space (macropore) decreased in disturbed (compacted) areas compared to adjacent undisturbed areas. Among disturbed soils, motor vehicle trails and parking lots had a significantly greater compaction, higher bulk density, and a lower percent pore space compared to human hiking/biking trails. Water infiltration and area of water spread (surface water runoff) were an interactive...
Categories: Publication;
Types: Citation,
Conference Citation;
Tags: Coleogyne ramosissima,
Proceedings RMRS-P-47: Shrubland dynamics, fire and water,
blackbrush,
fire,
recreational activities,
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