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首页> 外文期刊>Carbon balance and management >Historical effects of dissolved organic carbon export and land management decisions on the watershed-scale forest carbon budget of a coastal British Columbia Douglas-fir-dominated landscape
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Historical effects of dissolved organic carbon export and land management decisions on the watershed-scale forest carbon budget of a coastal British Columbia Douglas-fir-dominated landscape

机译：溶解性有机碳出口和土地管理决定对不列颠哥伦比亚省道格拉斯冷杉为主的沿海地区的分水岭规模森林碳收支的历史影响

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BackgroundTo address how natural disturbance, forest harvest, and deforestation from reservoir creation affect landscape-level carbon (C) budgets, a retrospective C budget for the 8500?ha Sooke Lake Watershed (SLW) from 1911 to 2012 was developed using historical spatial inventory and disturbance data. To simulate forest C dynamics, data was input into a spatially-explicit version of the Carbon Budget Model-Canadian Forest Sector (CBM-CFS3). Transfers of terrestrial C to inland aquatic environments need to be considered to better capture the watershed scale C balance. Using dissolved organic C (DOC) and stream flow measurements from three SLW catchments, DOC load into the reservoir was derived for a 17-year period. C stocks and stock changes between a baseline and two alternative management scenarios were compared to understand the relative impact of successive reservoir expansions and sustained harvest activity over the 100-year period. ResultsDissolved organic C flux for the three catchments ranged from 0.017 to 0.057?Mg?C?ha?1?year?1. Constraining CBM-CFS3 to observed DOC loads required parameterization of humified soil C losses of 2.5, 5.5, and 6.5%. Scaled to the watershed and assuming none of the exported terrestrial DOC was respired to CO2, we hypothesize that over 100?years up to 30,657?Mg?C may have been available for sequestration in sediment. By 2012, deforestation due to reservoir creation/expansion resulted in the watershed forest lands sequestering 14?Mg?C?ha?1 less than without reservoir expansion. Sustained harvest activity had a substantially greater impact, reducing forest C stores by 93?Mg?C?ha?1 by 2012. However approximately half of the C exported as merchantable wood during logging (~176,000?Mg?C) may remain in harvested wood products, reducing the cumulative impact of forestry activity from 93 to 71?Mg?C?ha?1. ConclusionsDissolved organic C flux from temperate forest ecosystems is a small but persistent C flux which may have long term implications for C storage in inland aquatic systems. This is a first step integrating fluvial transport of C into a forest carbon model by parameterizing DOC flux from soil C pools. While deforestation related to successive reservoir expansions did impact the watershed-scale C budget, over multi-decadal time periods, sustained harvest activity was more influential.
机译：背景为了解决自然扰动，森林砍伐和水库建设造成的森林砍伐如何影响景观水平的碳（C）预算，使用历史空间清单和干扰数据。为了模拟森林的C动态，将数据输入到碳预算模型-加拿大森林部门（CBM-CFS3）的空间明确版本中。需要考虑将陆地C转移到内陆水生环境，以更好地捕获流域C尺度的平衡。利用溶解有机碳（DOC）和来自三个SLW集水区的水流测量结果，推算出油藏中DOC的负载量为17年。比较了基线和两个替代管理方案之间的C储量和储量变化，以了解连续的储层扩张和持续100年的采伐活动的相对影响。结果3个流域的溶解有机碳通量范围为0.017〜0.057？Mg？C？ha ？1 ？year ？1 。将CBM-CFS3约束到观察到的DOC负荷要求将腐殖土C损失的参数设置为2.5、5.5和6.5％。根据分水岭的规模，并假设没有出口的地面DOC被呼吸到CO 2 ，我们假设可能已有100多年的时间将高达30,657？Mg？C的碳封存。到2012年，由于水库建设/扩建而造成的森林砍伐导致流域林地的固存量比没有水库扩建时少14？Mg？C？ha ？1 。持续的采伐活动产生了更大的影响，到2012年森林碳储量减少了93？Mg？C？ha ？1 。但是，大约有一半的碳以伐木的形式作为商品木出口（〜176,000？Mg）。 ？C）可能残留在收获的木材产品中，从而将林业活动的累积影响从93？Mg？C？ha ？1 减少到71。结论来自温带森林生态系统的溶解性有机碳通量是一个很小但持久的碳通量，可能对内陆水生系统中的碳储存有长期影响。这是第一步，通过参数化来自土壤碳库的DOC通量，将C的河流运移整合到森林碳模型中。尽管与连续的水库扩张有关的森林砍伐确实影响了流域规模的C预算，但在数十年的时间段内，持续的采伐活动更具影响力。

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