tailieunhanh - Báo cáo lâm nghiệp: "Carbon stock changes in a peaty gley soil profile after afforestation with Sitka spruce (Picea sitchensis)"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: "Carbon stock changes in a peaty gley soil profile after afforestation with Sitka spruce (Picea sitchensis)" | Ann. For. Sci. 62 2005 873-880 873 INRA EDP Sciences 2005 DOI forest 2005078 Original article Carbon stock changes in a peaty gley soil profile after afforestation with Sitka spruce Picea sitchensis Argyro Zerva Maurizio Mencuccini School of GeoSciences IERM Edinburgh University Darwin Building Mayfield Rd Edinburgh EH9 3JU United Kingdom Received 13 April 2004 accepted 16 February 2005 Abstract - We investigated the changes of carbon Corg stocks in the litter Ol organic Oh and mineral A layer after afforestation and at different stages after clearfelling of the first rotation in a forest chronosequence of Sitka spruce Picea sitchensis on peaty gley soil in Harwood Forest . England . The sites chosen were unplanted natural grassland 40-yr-old first rotation 18 months-old clearfelled and 12 20 and a 30 yr-old second rotation. A further comparison was carried out in three 40-yr-old stands between unplanted stripes of land rides and adjacent forest. Measurements of soil Corg were conducted with two methods . weight loss on ignition . and dry combustion by C N analysis. The results from two methods were linearly related. Afforestation changed both the total amounts and the distribution of the corg stocks from the unplanted natural grassland. The total stocks of corg decreased during first rotation and increased during second rotation to values similar to those found in the unplanted grassland. The vertical distribution of corg also changed with proportionally more carbon stored in the OL and inside the A layer and less in the organic layer after afforestation and two rotations. soil carbon stocks bulk density C concentration Sitka spruce forest management peaty gley soil Résumé - Changement des stocks de carbone dans le profil des sols tourbeux à gley après boisement avec l epicea de Sitka Picea sitchensis Bong. Carr . Les variations de stocks de carbone Corg dans la litière Ol dans l horizon organique Oh et l horizon minéral A ont été étudiées après