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ForSite | Nutrient exchanges | Biomass Harvesting | Edit

Page:	biomassharvesting
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Text	Nutrients accumulate in living trees as they grow. Some are removed from the site when stems are harvested as timber. Larger amounts of nutrients will be removed if branches and needles are harvested. <p> Nutrient pools in harvestable biomass are calculated using nutrient concentrations of tissues, and mass. ForSite has developed a <a href='/pdf/Specification_Biomass_Fractions.pdf' target='_blank'>Specification for Estimating Biomass Fractions</a>. <div class='panel'> Nutrient pools in forest biomass <br/><span style='font-size:18px;'>Sitka spruce, Yield Class 20, 35 years old, unthinned</span> <table style='width: 100%;'> <tr> <th></th> <th style='text-align:center;'>Biomass</th> <th style='text-align:center;'>N</th> <th style='text-align:center;'>P</th> <th style='text-align:center;'>K</th> <th style='text-align:center;'>Ca</th> <th style='text-align:center;'>Mg</th> <th style='text-align:center;'>S</th> </tr> <tr> <td></td> <td style='text-align:center;'>t/ha</td> <td colspan='6' style='text-align:center; border-style: hidden hidden solid hidden; border-width:0.5px;'>kg/ha</td> </tr> <tr> <td>Stem wood</td> <td style='text-align:right;padding-right:10px;'>171</td> <td style='text-align:right;padding-right:4px;'>107</td> <td style='text-align:right;padding-right:4px;'>7</td> <td style='text-align:right;padding-right:4px;'>67</td> <td style='text-align:right;padding-right:4px;'>87</td> <td style='text-align:right;padding-right:4px;'>14</td> <td style='text-align:right;padding-right:4px;'>71</td> </tr> <tr> <td>Stem bark</td> <td style='text-align:right;padding-right:10px;'>18</td> <td style='text-align:right;padding-right:4px;'>66</td> <td style='text-align:right;padding-right:4px;'>8</td> <td style='text-align:right;padding-right:4px;'>39</td> <td style='text-align:right;padding-right:4px;'>77</td> <td style='text-align:right;padding-right:4px;'>9</td> <td style='text-align:right;padding-right:4px;'>10</td> </tr> <tr> <td>Branches</td> <td style='text-align:right;padding-right:10px;'>33</td> <td style='text-align:right;padding-right:4px;'>145</td> <td style='text-align:right;padding-right:4px;'>13</td> <td style='text-align:right;padding-right:4px;'>53</td> <td style='text-align:right;padding-right:4px;'>86</td> <td style='text-align:right;padding-right:4px;'>17</td> <td style='text-align:right;padding-right:4px;'>20</td> </tr> <tr> <td>Needles</td> <td style='text-align:right;padding-right:10px;'>15</td> <td style='text-align:right;padding-right:4px;'>217</td> <td style='text-align:right;padding-right:4px;'>20</td> <td style='text-align:right;padding-right:4px;'>101</td> <td style='text-align:right;padding-right:4px;'>58</td> <td style='text-align:right;padding-right:4px;'>14</td> <td style='text-align:right;padding-right:4px;'>20</td> </tr> </table> </div>
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Image Caption	Biomass harvesting. Tree tops and branches are included in this material presented at roadside for chipping. This is a form of whole-tree harvest (WTH), and contrasts with conventional stem-only harvest (SOH) where only logs are removed from the forest.
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