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Fertile forests produce biomass more efficiently

机译:茂密的森林更有效地生产生物质

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摘要

Trees with sufficient nutrition are known to allocate carbon preferentially to aboveground plant parts. Our global study of 49 forests revealed an even more fundamental carbon allocation response to nutrient availability: forests with high-nutrient availability use 58±3% (mean±SE; 17 forests) of their photosynthates for plant biomass production (BP), while forests with low-nutrient availability only convert 42±2% (mean±SE; 19 forests) of annual photosynthates to biomass. This nutrient effect largely overshadows previously observed differences in carbon allocation patterns among climate zones, forest types and age classes. If forests with low-nutrient availability use 16±4% less of their photosynthates for plant growth, what are these used for? Current knowledge suggests that lower BP per unit photosynthesis in forests with low- versus forests with high-nutrient availability reflects not merely an increase in plant respiration, but likely results from reduced carbon allocation to unaccounted components of net primary production, particularly root symbionts.
机译:营养充足的树木可优先分配碳给地上植物。我们对49种森林进行的全球研究表明,碳对分配的养分甚至有更根本的响应:养分高的森林将58±3%(平均±SE; 17个森林)的光合产物用于植物生物量生产(BP),而森林养分利用率低的情况下,仅将42±2%(平均±SE; 19个森林)的年度光合产物转化为生物量。这种养分效应大大掩盖了先前观察到的气候带,森林类型和年龄类别之间碳分配模式的差异。如果养分利用率低的森林光合作用的植物减少了16±4%,这些植物有什么用?当前的知识表明,低养分森林与高养分森林之间森林每单位光合作用的较低BP不仅反映了植物呼吸的增加,而且可能是由于碳分配减少至净初级生产的未解释部分,特别是根部共生体的结果。

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