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首页> 外文期刊>Journal of Experimental Botany >Nitrogen to phosphorus ratio of plant biomass versus soil solution in a tropical pioneer tree, Ficus insipida
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Nitrogen to phosphorus ratio of plant biomass versus soil solution in a tropical pioneer tree, Ficus insipida

机译：热带先锋树榕（Ficus insipida）植物生物量与土壤溶液的氮磷比

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摘要

It is commonly assumed that the nitrogen to phosphorus (N:P) ratio of a terrestrial plant reflects the relative availability of N and P in the soil in which the plant grows. Here, this was assessed for a tropical pioneer tree, Ficus insipida. Seedlings were grown in sand and irrigated with nutrient solutions containing N:P ratios ranging from 100. The experimental design further allowed investigation of physiological responses to N and P availability. Homeostatic control over N:P ratios was stronger in leaves than in stems or roots, suggesting that N:P ratios of stems and roots are more sensitive indicators of the relative availability of N and P at a site than N:P ratios of leaves. The leaf N:P ratio at which the largest plant dry mass and highest photosynthetic rates were achieved was ∼11, whereas the corresponding whole-plant N:P ratio was ∼6. Plant P concentration varied as a function of transpiration rate at constant nutrient solution P concentration, possibly due to transpiration-induced variation in the mass flow of P to root surfaces. The transpiration rate varied in response to nutrient solution N concentration, but not to nutrient solution P concentration, demonstrating nutritional control over transpiration by N but not P. Water-use efficiency varied as a function of N availability, but not as a function of P availability.
机译：通常假定陆生植物的氮磷比率反映了植物生长土壤中氮和磷的相对利用率。在此，对热带先锋树榕（Ficus insipida）进行了评估。幼苗在沙子中生长，并用N：P比例为100的营养液灌溉。实验设计进一步允许研究对N和P利用率的生理响应。叶片中N：P比的稳态控制要强于茎或根，表明茎和根的N：P比比叶片的N：P比更敏感地指示了氮和磷的相对利用率。达到最大植物干重和最高光合速率的叶片N：P比为〜11，而相应的整株植物N：P比为〜6。在恒定的营养液浓度下，植物磷的浓度随蒸腾速率的变化而变化，这可能是由于蒸腾引起的磷在根表面的质量流量变化所致。蒸腾速率随营养液中氮的含量而变化，但不随营养液中P的浓度而变化，这表明营养对氮的蒸腾作用（而非磷）的控制。水分利用效率随氮素利用率的变化而变化，但与磷素的函数无关可用性。

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