<?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%">Throop, H.L.</style></author><author><style face="normal" font="default" size="100%">Archer, S.R.</style></author><author><style face="normal" font="default" size="100%">Monger, H. C.</style></author><author><style face="normal" font="default" size="100%">Waltman, S.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">When bulk density methods matter: implications for estimating soil organic carbon pools in coarse soils</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%">bulk density</style></keyword><keyword><style  face="normal" font="default" size="100%">carbon pool</style></keyword><keyword><style  face="normal" font="default" size="100%">SOC</style></keyword><keyword><style  face="normal" font="default" size="100%">soil organic carbon</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2012</style></year><pub-dates><date><style  face="normal" font="default" size="100%">02/2012</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">bibliography/12-001.pdf</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">77</style></volume><pages><style face="normal" font="default" size="100%">66-71</style></pages><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Resolving uncertainty in the carbon cycle is paramount to refining climate predictions. Soil organic carbon (SOC) is a major component of terrestrial C pools, and accuracy of SOC estimates are only as good as the measurements and assumptions used to obtain them. Dryland soils account for a substantial portion of global SOC, but the pool dynamics are highly uncertain. One crucial component of accurate estimates of SOC on an areal basis is bulk density (&amp;rho;b), the mass of soil per unit volume. Here, we review methods used for calculating &amp;rho;b and assess their prevalence. We show how treatment of coarse fragments (particles &amp;gt;2 mm diameter) influences &amp;rho;b values and discuss the implications for SOC estimates in drylands. In four dryland examples, methods that varied in their treatment of coarse fragments led to substantial (up to 26%) differences in &amp;rho;b. Calculated SOC pools responded proportionally, with SOC differing by up to 518 g C m&amp;minus;2. We suggest a revised method for accounting for coarse fractions in &amp;rho;b calculations. A large portion of the world&amp;rsquo;s soils, particularly in drylands, are fine enough to allow &amp;rho;b determination with cores, but contain coarse fragments that substantially impact SOC mass estimates if not explicitly considered.&lt;/p&gt;
</style></abstract><accession-num><style face="normal" font="default" size="100%">JRN3291</style></accession-num><section><style face="normal" font="default" size="100%">66</style></section></record></records></xml>