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For several decades, southern California experienced the worst ozone pollution ever reported. Peak ozone concentrations have, however, declined steadily since 1980. In this study, the structural injuries underlying ozone symptoms in needles of ponderosa pine (Pinus ponderosa Dougl. ex Laws.) collected in summer 2006 from one of the most polluted sites in the San Bernardino Mountains were investigated...
Vegetation processes in terrestrial ecosystems are closely linked with wildfire regime, but fire histories at the boundary between the Great Basin and Mojave Deserts of North America are relatively sparse. We investigated wildfire regime and its driving factors before and after Euro-American settlement in high-elevation mixed-conifer ecosystems that are found as “mountain islands” in south-eastern...
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