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首页> 外文期刊>Global change biology bioenergy >A salt on the bioenergy and biological invasions debate: salinity tolerance of the invasive biomass feedstock Arundo donax
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A salt on the bioenergy and biological invasions debate: salinity tolerance of the invasive biomass feedstock Arundo donax

机译：生物能源和生物侵犯的盐辩论：侵入生物质原料arundo Donax的盐度耐受性

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Arundo donax L., commonly known as giant reed, is promising biomass feedstock that is also a notorious invasive plant in freshwater ecosystems around the world. Heretofore, the salt tolerance of A.?donax had not been quantified even though anecdotal evidence suggests halophytic qualities. To test whole-plant and leaf level responses, we established a pot experiment on 80 scions propagated from an A.?donax population that has naturalized on the shore of the San Francisco Bay Estuary. To quantify growth and physiological responses to salinity ( NaCl ), A.?donax scions were divided into eight treatments and grown for 60?days across a range of salinities (0–42 dS?msup?1/sup). Classic growth analysis showed 80% reduction in overall growth at the highest salinities. Yet, there was zero mortality indicating that A.?donax is able to tolerate high levels of salt. Declining photosynthesis rates were strongly correlated ( R sup2/sup??0.97) with decreasing stomatal conductance, which was in turn closely related to increasing salinity. Leaf gas exchange revealed that stomata and leaf limitations of carbon dioxide were three times greater at high salinities. Nonetheless, even when salinities were 38–42 dS?msup?1/sup A.?donax was able to maintain assimilation rates 7–12?μmol?msup?2/sup?ssup?1/sup. Further, by maintaining 50% relative growth at salinities ~12 dS?msup?1/sup A.?donax can now be classified as ‘moderately salt tolerant’. A.?donax leaf gas exchange and whole-plant salt tolerance are greater than many important food crops (i.e. maize, rice), the bioenergy feedstock Miscanthus?×?giganteus, as well as some uncultivated plant species (i.e. Populus and Salix ) that are indigenous in regions A.?donax currently invades. The results of this study have implications for both agronomists wishing to expand A.?donax to fields dominated by saline soils, and for others who are concerned about the spread of A.?donax with altered stream hydrology or sea-level rise.
机译：Arundo Donax L.，俗称巨人芦苇，是有前途的生物质原料，也是世界各地淡水生态系统中的臭名昭着的侵入性植物。迄今为止，即使轶事证据表明嗜睡品质表明，A.?donax的耐盐性也没有量化。为了测试全植物和叶片水平反应，我们建立了80个中的盆栽试验，从A.?donax群体植入旧金山湾口岸的植物。为了量化对盐度（NaCl）的生长和生理反应，将A.?Donax间隙分为八个处理，并在一系列盐度（0-42dsαmα1）上生长60？天。经典增长分析显示，最高盐度的总体增长减少了80％。然而，存在零死亡率，表明A.?donax能够耐受高水平的盐。衰落的光合速率下降（R 2 α> 0.97），气孔导率下降，与盐度的增加密切相关。叶片气体交易所显示，在高盐素下，二氧化碳的气孔和叶片局限性较大三倍。尽管如此，即使盐度为38-42ds？m 1/4 / s.?doonax也能够维持同化率7-12Ω·μmol？m ？2 ？s < sup>？1 。此外，通过将盐度的50％相对生长维持〜12ds〜12dsα1，现在可以被归类为“中等耐盐”。 A.?donax叶片气体交换和全植物耐药性大于许多重要的食物作物（即玉米，水稻），生物能源原料miscanthus？×α？giganteus，以及一些未开垦的植物物种（即杨树和盐酱）在地区A.?donax目前是侵入的土着。该研究的结果对希望将A.?donax扩展到盐渍土的田地的农学家以及对其涉及A.?donax传播的田地的田间的影响有影响，以及具有改变的流水文或海平面上升。

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