<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>13</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Weiss, Stuart B.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Impacts of Nitrogen Deposition on California Ecosystems and Biodiversity</style></title></titles><keywords><keyword><style  face="normal" font="default" size="100%">nitrogen deposition biodiversity California annual grasses invasive species deserts grasslands threatened and endangered species eutrophication</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2006</style></year><pub-dates><date><style  face="normal" font="default" size="100%">May 2006</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%">CEC-500-2005-165</style></number><publisher><style face="normal" font="default" size="100%">University of California Santa Barbara and Creekside Center for Earth Observations</style></publisher><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Recognized as a &quot;biodiversity hotspot,&quot; California supports numerous endemic taxa with narrow ranges, and that diversity may be threatened by atmospheric nitrogen deposition. This California-wide risk screening included: (1) a 36 x 36 kilometer (km) map of total Nitrogen (N)-deposition for 2002, developed from the Community Multiscale Air Quality Model (CMAQ); (2) identification of sensitive habitats; (3) an overlay of the Forest Resource and Protection (FRAP) vegetation map; (4) an overlay of animal and plant species occurrence data from the California Natural Diversity Data Base (CNDDB); (5) an initial analysis of species life history and habitat; and (6) a discussion of relevance and guidance for assessments of power plant impacts. An area of 55,000 square kilometers (km2) of California is exposed to more than 5 kilograms of N per hectare per year (kg-N ha-1 year-1), and 10,000 km2 are exposed to more than 10 kg-N ha-1 year-1. Deposition hotspots include: Los Angeles-San Diego, the San Francisco Bay Area, the Central Valley, and the Sierra Nevada foothills. The major documented impact of N-deposition on California terrestrial biodiversity is to increase invasive annual grasses in low biomass ecosystems, resulting in species loss. Of 225 &quot;threatened&quot; and &quot;endangered&quot; plant taxa, 99 are exposed to an average &gt; 5 kg-N ha-1 year-1. Of 1,022 &quot;rare&quot; plant taxa, 290 are exposed to &gt; 5 kg-N ha-1 year-1. Listed animal species follow similar patterns. This initial screening outlines potential impacts on California&#039;s biodiversity and provides targeted guidance for assessing the impacts of power plant and other sources of atmospheric N-deposition.</style></abstract><work-type><style face="normal" font="default" size="100%">Final Project Report prepared for California Energy Commission, Public Interest Energy Research Program</style></work-type></record></records></xml>