<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Huenneke, Laura F.</style></author><author><style face="normal" font="default" size="100%">Clason, Dennis</style></author><author><style face="normal" font="default" size="100%">Muldavin, Esteban</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Spatial heterogeneity in Chihuahuan Desert vegetation: implications for sampling methods in semi-arid ecosystems</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Arid Environments</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">article</style></keyword><keyword><style  face="normal" font="default" size="100%">articles</style></keyword><keyword><style  face="normal" font="default" size="100%">Bouteloua, net primary production</style></keyword><keyword><style  face="normal" font="default" size="100%">ecosystem, plant production</style></keyword><keyword><style  face="normal" font="default" size="100%">journal</style></keyword><keyword><style  face="normal" font="default" size="100%">journals</style></keyword><keyword><style  face="normal" font="default" size="100%">Larrea, net primary production</style></keyword><keyword><style  face="normal" font="default" size="100%">net primary production</style></keyword><keyword><style  face="normal" font="default" size="100%">plants, net primary production</style></keyword><keyword><style  face="normal" font="default" size="100%">Prosopis, net primary production</style></keyword><keyword><style  face="normal" font="default" size="100%">spatial heterogeneity</style></keyword><keyword><style  face="normal" font="default" size="100%">technique, aboveground NPP</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2001</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2001</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">47</style></volume><pages><style face="normal" font="default" size="100%">257-270</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Patchiness of above-ground vegetation, such as that in semi-arid grasslands and shrublands, can pose problems in sampling plant cover, biomass and productivity.  We present a method of measuring above-ground plant biomass and production that can be applied consistently among vegetation types and that generates seasonal, spatially-explicit results.  Results from 15 sites within the Jornada Basin (Chihuahuan Desert, New Mexico, USA) confirm considerable patchiness and non-normal distributions of plant biomass, even in grasslands.  However, tests of adequacy of sample size and of sample error associated with the regression-based estimates of biomass confirmed that the estimates of above-ground net primary productivity are sufficiently precise to be useful in comparisons of both shrub-dominated and grassland sites.</style></abstract><accession-num><style face="normal" font="default" size="100%">JRN1278</style></accession-num><call-num><style face="normal" font="default" size="100%">00749</style></call-num><notes><style face="normal" font="default" size="100%">//NMSU,USDA//LTER IV//</style></notes><reprint-edition><style face="normal" font="default" size="100%">In File (02/23/2001)</style></reprint-edition><label><style face="normal" font="default" size="100%">1117</style></label></record></records></xml>