首页> 外文会议>International Conference on Regional Carbon Budgets; 20060816-18; Beijing(CN) >Site influences on net ecosystem productivity in managed Abies Balsamea stands
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Site influences on net ecosystem productivity in managed Abies Balsamea stands

机译:地点对受控Abies Balsamea林分中净生态系统生产力的影响

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This paper investigates site influences on net ecosystem productivity (NEP) in 15 managed balsam fir stands in SW New Brunswick, Canada. Flux towers in 2 of the 15 stands provide a short-term measurement of NEP and site micrometeorology for the June 29-November 30, 2004 period. Site conditions between Charlie Lake (CL01) and Nashwaak Lake (NWL) flux sites for the 2004 period reveal few differences. The greatest differences occur in soil temperature and soil water content (SWC), with CL01 being the warmer and wetter of the two sites. These differences, particularly in SWC are hypothesized to be responsible for the 29% increase in NEP at CL01 for the 2004 period. Slope position (SP), an index of potential soil wetness, indicates because of physiographic position NWL has dryer soils. Stem analysis of 42 trees from the two sites show that over the lifetime of the stands, mean annual increment at CL01 was 4.8 compared with 4.5 m~3 ha~(-1) yr~(-1) for NWL. Relating SI to SP revealed that SI co-varies with SP in a parabolic fashion. Excessively wet or dry soils are shown to have reduced site productivity, while soils with intermediate SWC promote improved stand growth.
机译:本文调查了加拿大西南部新不伦瑞克省15个管理香脂冷杉林分的站点对净生态系统生产力(NEP)的影响。 15个展位中有2个的通量塔可提供2004年6月29日至11月30日期间的NEP和站点微气象的短期测量。 2004年期间查理湖(CL01)和纳什瓦克湖(NWL)通量站点之间的站点条件几乎没有差异。最大的差异出现在土壤温度和土壤水分(SWC)上,CL01是两个地点的较暖和较湿。假设这些差异(特别是在SWC中)是导致2004年CL01的NEP增加29%的原因。斜坡位置(SP)是潜在土壤湿度的指标,它表示由于生理位置,NWL的土壤较干燥。对这两个地点的42棵树木进行的茎干分析表明,在林分的整个生命周期中,CL01的年平均增幅为4.8,而NWL的年平均增幅为4.5 m〜3 ha〜(-1)yr〜(-1)。将SI与SP相关联表明,SI与SP以抛物线形式共变。事实证明,过度潮湿或干燥的土壤会降低站点生产力,而具有中等SWC的土壤则会促进林分生长。

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