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Variation in Tree Growth along Soil Formation and Microtopographic Gradients in Riparian Forests
Wetlands ( IF 2 ) Pub Date : 2020-09-08 , DOI: 10.1007/s13157-020-01363-9
Christian O. Marks , Brian C. Yellen , Stephen A. Wood , Erik H. Martin , Keith H. Nislow

Policy makers are interested in managing forests to store carbon. Optimizing this strategy requires understanding how carbon storage varies across environmental gradients. We explored variation in tree growth rate, tree longevity, and surface soil organic matter across 135 Connecticut River riparian forest plots. Tree growth rate did not vary significantly with climate but rather increased with sediment accretion rate, soil pH and decreased with plot elevation, where elevation was measured relative to the stage of the 2-year flood. By contrast, surface soil organic matter was negatively related to pH and tree growth rate. Tree species longevities were greater at higher elevations with coarser soils. The faster growth rates at lower elevations allow for restoring forest structure rapidly, whereas flood intolerant but longer-lived tree species allow more durable carbon sequestration at higher elevations. The close associations of growth rate, sediment accretion, and pH suggest that riverine nutrient inputs are important to maintaining the exceptionally high productivity of floodplains. Environmental assessments of river dams should consider impacts of intercepting sediments and reducing flooding on downstream floodplain fertility and productivity. Restoration of riparian locations with high deposition of sediments and associated nutrients may be an opportunity to maximize both nutrient and carbon sequestration.



中文翻译:

沿岸森林树木生长随土壤形成和微观地形梯度的变化

政策制定者对管理森林储存碳有兴趣。优化此策略需要了解碳存储如何随环境梯度变化。我们探索了135个康涅狄格河沿岸森林地块的树木生长速率,树木寿命和表层土壤有机质的变化。树木的生长率并没有随气候变化而显着变化,而是随沉积物积聚率,土壤pH值的增加而增加,而随着地块高度的增加而降低,其中相对于两年洪水的阶段来测量。相比之下,表层土壤有机质与pH值和树木生长速度呈负相关。土壤海拔较高时,树种寿命更长。低海拔地区更快的生长速度可以迅速恢复森林结构,而抗洪但寿命更长的树种可以在更高的海拔高度持久地固存碳。增长率,沉积物积聚和pH值密切相关,表明河流养分输入对于保持洪泛区异常高的生产力非常重要。对大坝的环境评估应考虑拦截沉积物和减少洪水对下游洪泛区肥力和生产力的影响。恢复沉积物和相关养分含量高的河岸位置可能是最大限度地养分养分和碳固存的机会。和pH值表明,河流养分输入对于保持洪泛区异常高的生产力非常重要。对大坝的环境评估应考虑拦截沉积物和减少洪水对下游洪泛区肥力和生产力的影响。恢复沉积物和相关养分含量高的河岸位置可能是最大限度地养分养分和碳固存的机会。和pH值表明,河流养分输入对于保持洪泛区异常高的生产力非常重要。对大坝的环境评估应考虑拦截沉积物和减少洪水对下游洪泛区肥力和生产力的影响。恢复沉积物和相关养分含量高的河岸位置可能是最大限度地养分养分和碳固存的机会。

更新日期:2020-09-08
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