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首页> 外文期刊>Plant and Soil >Competition for nitrogen between Pinus sylvestris and ectomycorrhizal fungi generates potential for negative feedback under elevated CO2
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Competition for nitrogen between Pinus sylvestris and ectomycorrhizal fungi generates potential for negative feedback under elevated CO2

机译：樟子松与外生菌根真菌之间的氮竞争产生了在CO2升高的情况下产生负反馈的潜力

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摘要

We investigated fungal species-specific responses of ectomycorrhizal (ECM) Scots pine (Pinus sylvestris) seedlings on growth and nutrient acquisition together with mycelial development under ambient and elevated CO2. Each seedling was associated with one of the following ECM species: Hebeloma cylindrosporum, Laccaria bicolor, Suillus bovinus, S. luteus, Piloderma croceum, Paxillus involutus, Boletus badius, or non-mycorrhizal, under ambient, and elevated CO2 (350 or 700 micro l l-1 CO2); each treatment contained six replicates. The trial lasted 156 days. During the final 28 days, the seedlings were labeled with 14CO2. We measured hyphal length, plant biomass, 14C allocation, and plant nitrogen and phosphorus concentration. Almost all parameters were significantly affected by fungal species and/or CO2. There were very few significant interactions. Elevated CO2 decreased shoot-to-root ratio, most strongly so in species with the largest extraradical mycelium. Under elevated CO2, ECM root growth increased significantly more than hyphal growth. Extraradical hyphal length was significantly negatively correlated with shoot biomass, shoot N content, and total plant N uptake. Root dry weight was significantly negatively correlated with root N and P concentration. Fungal sink strength for N strongly affected plant growth through N immobilization. Mycorrhizal fungal-induced progressive nitrogen limitation (PNL) has the potential to generate negative feedback with plant growth under elevated CO2..
机译：我们调查了外生菌根（ECM）苏格兰松（Pinus sylvestris）幼苗对真菌的种属特异性生长和营养吸收以及菌丝在环境和升高的CO2下的发育。每棵幼苗都与以下ECM物种之一相关：在环境条件下，并且在CO2浓度升高（350或700微米）的情况下，圆柱形的Hebeloma cylindrosporum，双色的Laccaria，牛肝菌，黄色葡萄球菌，黄萎病菌，croxum involutus，牛肝菌或非菌根。 l l-1 CO2）;每种处理均重复六次。审判持续了156天。在最后28天内，将幼苗标记为14CO2。我们测量了菌丝长度，植物生物量，14C分配以及植物氮和磷的浓度。几乎所有参数都受到真菌种类和/或CO2的显着影响。很少有重要的交互作用。二氧化碳浓度升高会降低根与茎的比率，在根外菌丝最大的物种中尤为明显。在二氧化碳升高的情况下，ECM根的生长明显大于菌丝的生长。根外菌丝长度与枝条生物量，枝条氮含量和植物总氮吸收量呈显着负相关。根干重与根氮和磷浓度显着负相关。氮的真菌吸收强度通过固定氮强烈影响植物的生长。在CO 2浓度升高的情况下，菌根真菌诱导的进行性氮限制（PNL）可能会随着植物的生长产生负反馈。

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