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首页> 外文期刊>Tellus, Series B. Chemical and Physical Meteorology >The photosynthetic response of a high-altitude spruce forest to nitrogen amendments with implications for gross primary productivity
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The photosynthetic response of a high-altitude spruce forest to nitrogen amendments with implications for gross primary productivity

机译：高海拔云杉林对氮素改良的光合作用响应，对总初级生产力有影响

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摘要

Characterizing the capacity of the terrestrial biome to absorb CO2 is one of the most pressing topics in climate science.One of the key players in this arena is also one of the most poorly understood: the role of nitrogen deposition. While N deposition seems to fertilize some forests, in others it has been blamed for forest decline and tree mortality. In order to further understand the role of N deposition in forest primary productivity, an in situ N-amendment study was conducted in a relatively high N deposition region of the CO Rocky Mountains over 3 yr.Chlorophyll fluorometry is a non-invasive technique that allows for the characterization of photosynthetic efficiency and photoinhibition in plants. Analysis of chlorophyll fluorometry data showed that in this tree line forest, moderate amounts of additional N significantly lower the photosynthetic efficiency of individual branches when compared to control branches, while significantly improving the non-photochemical dissipation of excess absorbed energy. This suggests that in high-altitude spruce forests receiving relatively high N inputs, GPP may be impaired by continued chronic additions of N. One potential cause of this is an increase in the light harvesting capacity of N amended branches without a concurrent increase in photosynthesis.
机译：表征陆地生物群系吸收二氧化碳的能力是气候科学中最紧迫的主题之一。这个领域的关键参与者之一也是人们最不了解的问题之一：氮沉积的作用。虽然氮的沉积似乎使一些森林肥沃，但在其他森林中，氮的沉积却被归咎于森林的减少和树木的死亡。为了进一步了解氮沉积在森林初级生产力中的作用，在3年多的时间里，在CO落基山的一个相对较高的N沉积区域进行了原位N修正研究。叶绿素荧光法是一种非侵入性技术，可以用于表征植物的光合作用效率和光抑制作用。叶绿素荧光数据分析表明，与对照树枝相比，在该林木森林中，适量的附加氮显着降低了单个树枝的光合作用效率，同时显着提高了多余吸收能量的非光化学耗散。这表明在接受相对较高N输入的高空云杉林中，GPP可能会由于持续长期添加N而受到损害。其潜在原因之一是增加了N个修正分支的采光能力，而没有同时增加光合作用。

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