Comparison of carbon dynamics and water use efficiency following fire and harvesting in Canadian boreal forests
Comparison of carbon dynamics and water use efficiency following fire and harvesting in Canadian boreal forests
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DOI：
10.1016/j.agrformet.2008.10.025
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发表时间：
2009-05
影响因子：
6.2
通讯作者：
M. Mkhabela;B. Amiro;A. Barr;T. A. Black;I. Hawthorne;J. Kidston;J. Mccaughey;A. Orchansky;
中科院分区：
文献类型：
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作者：
M. Mkhabela;B. Amiro;A. Barr;T. A. Black;I. Hawthorne;J. Kidston;J. Mccaughey;A. Orchansky;
火烧和采伐是加拿大北方森林的主要更新过程。涡度相关法被用来比较生态系统之间的二氧化碳通量采伐和燃烧的北方森林在加拿大萨斯喀彻温省的网站。收获年代序列中有2002年（HJP 02）、1994年（HJP 94）和1975年（HJP 75）收获的地点，而火灾年代序列中有1998年（F98）、1989年（F89）、1977年（F77）和1929年（OJP）烧毁的地点。在干扰发生之前，所有地点都以短叶松为主。在2004年和2005年期间，生态系统净生产力显示出平均碳增益（gCm− 2年−1），F89=84，HJP 75 =80，HJP 94 =14和OJP=20。其他站点的碳损失（gCm−2year−1）分别为HJP02=−139、F98=−20和F77=−58。总生态系统生产力（GEP），生态系统呼吸（Re）和蒸散量往往是更大的烧伤网站比收获的网站。F89和F77点的GEP对光合有效辐射的响应最强，对2cm土壤温度的响应最强。HJP02的反应最弱，其次是HJP94。这种明显的更大的生态系统活动在燃烧的网站可能是由当地的土壤水分和养分的差异，植被发展的差异，粗木质残体的分解的差异。
Fire and harvesting are major forest renewal processes in the Canadian boreal forest. The eddy covariance method was used to compare ecosystem fluxes of carbon dioxide between harvested and burned boreal forest sites in Saskatchewan, Canada. The harvest chronosequence had sites harvested in 2002 (HJP02), 1994 (HJP94) and 1975 (HJP75), whereas the fire chronosequence sites were burned in 1998 (F98), 1989 (F89), 1977 (F77) and 1929 (OJP). All sites were dominated by jack pine prior to the disturbance. During 2004 and 2005, net ecosystem production showed an average carbon gain (gCm−2year−1) at F89=84, HJP75=80, HJP94=14 and OJP=20. The other sites lost carbon (gCm−2year−1) at HJP02=−139, F98=−20, and F77=−58. Gross ecosystem production (GEP), ecosystem respiration (Re) and evapotranspiration tended to be greater at the burned sites than the harvested sites. The F89 and F77 sites had the strongest response of GEP to photosynthetically active radiation, and the strongest response of Reto soil temperature at the 2-cm depth. HJP02 had the weakest responses, followed by HJP94. This apparent greater ecosystem activity at the burned sites is likely caused by local differences in soil moisture and nutrients, differences in vegetation development, and differences in the decomposition of coarse woody debris.