Gabbro Soils and Plant Distributions on Them

  title={Gabbro Soils and Plant Distributions on Them},
  author={Earl B. Alexander},
Abstract Gabbro is a mafic rock with many species that do not occur on soils of granitic or ultramafic rocks. Although some gabbro soils harbor many unique or endemic species, others do not, as botanists have noted from the Appalachian Piedmont to the mountains of California and Oregon. Gabbro soils were sampled in the Peninsular Ranges and in the foothills of the Sierra Nevada to identify special features of the gabbro soils with unique plant species distributions. No soil morphological or… 
Gabbro Soil-Plant Relations in the California Floristic Province
Abstract The paper reviews published botanical and pedological literature concerning gabbro in the California Floristic Province. Gabbro is a mafic plutonic rock that is common in the Sierra Nevada,
Comment on the Gabbro Soils of Pine Hill
Data indicate that the greatest differences between the surface soils at sites with different ceanothus species were different amounts of Mehlich III (dilute acids and EDTA) extractable P.
Foliar Analyses of Conifers On Serpentine and Gabbro Soils In the Klamath Mountains
The high Mg in the serpentine soils may interfere with the utilization of Ca by Douglas-fir trees causing their foliage to have lower Ca concentrations than in the foliage of Douglas- fir trees on gabbro soils, and for each of the three tree species, foliar N, P, and K concentrations were not appreciably different on serpentine versus gabb ro soils.
Soil Chemistry Patterns In An Edaphic Endemism Hotspot: The Pebble Plains of the San Bernardino Mountains, California
Abstract Pebble plains are a unique edaphic environment known only from the high valleys of the San Bernardino Mountains, California. The pebble plains have long been celebrated for the high vascular
The Role of Soil Chemistry in the Geographic Distribution of Ceanothus otayensis (Rhamnaceae)
Abstract Ceanothus otayensis McMinn (Rhamnaceae) was previously known only from metavolcanic-derived soils of the northern Peninsular Ranges—predominantly the San Ysidro Mountains—in San Diego
Carex xerophila (Cyperaceae), a New Sedge from the Chaparral of Northern California
Carex xerophila has more strongly nerved scales and perigynium faces than C. rossii Boott and is documented from four populations in or on the margins of chaparral and open forest.
Three Edaphic-Endemic Ceanothus (Rhamnaceae) New to Science
Three new taxa of Ceanothus are described, two initially noted among existing collections, and another discovered during botanical exploration in San Diego County, which are edaphic micro-endemics found only in the southern California Floristic Province, California.
Limited hybridization across an edaphic disjunction between the gabbro-endemic shrub Ceanothus roderickii (Rhamnaceae) and the soil-generalist Ceanothus cuneatus.
There is little genetic exchange between the focal species across an edaphic disjunction, despite the absence of prezygotic barriers, implying that soil conditions, as well as other extrinsic factors, should be considered as forces that may restrict hybridization and gene flow in Ceanothus, influencing local adaptation and speciation.


Vegetation and Flora of A Biodiversity Hotspot: Pine Hill, El Dorado County, California, USA
An extensive flora was assembled, the distribution and associations of vascular plant taxa were examined, and specifically focused on associations of six rare plantTaxa, and the influence of environmental variables on plant distribution was investigated using a stratified random plot sampling technique and applying canonical correspondence analyses.
Petrology and emplacement of the Los Pinos pluton, southern California
The Los Pinos gabbro is located on the eastern margin of the gabbro sub-belt of the Peninsular Ranges batholilh. Two lithologic sequences are recognized in this pluton. The outer group consists of
Petrology of the San Marcos gabbro, southern California
INTRODUCTION AND ACKNOWLEDGMENTS This paper includes the results of a petrologic investigation of the gabbroid rocks of the San Luis Rey Quadrangle, Southern California (Fig. 1). The unusual features
Geology of the Pine Hill Intrusive Complex, a Layered Gabbroic Body in the Western Sierra Nevada Foothills, California
The western Sierra Nevada metamorphic belt was subjected to several episodes of tectonism and metamorphism (Clark, 1960a, 1964; Baird, 1962; Bateman and others, 1963; Bateman and Wahrhaftig, 1966;
The nature, origin and accumulation of loess
  • K. Pye
  • Environmental Science, Geography
  • 1995
Vegetation of the Siskiyou Mountains, Oregon and California
Forest Vegetation of Higher Elevations on Diorite and the Two-Phase Ef fect .......... .............. . 299 Forest Vegetation in Transects.
Igneous Rocks: A Classification and Glossary of Terms
Figures Tables Albert Streckeisen Foreword to 1st edition Chairman's Preface Editor's Preface 1. Introduction 2. Classification and nomenclature 3. Glossary of terms 4. Bibliography of terms
Statistical Methods
P > 0.05 0.01 < P < 0.05 0.001 < P < 0.01 * * * multiple regression analyses were tested by t tests. Regression lines were compared by means of analysis of covariance in which differences in slopes
A Flora of San Diego County, California