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引用次数: 0
摘要
在经常发生火灾的生态系统中，共生固氮作用有可能补充火灾造成的氮损失。火灾与固氮之间可能存在密切关系，因为火灾会使氮挥发并使磷（P）矿化，从而形成贫氮、富含 P 的土壤，有利于能够固氮的植物生长。我们评估了氮和磷如何调节长叶松稀树草原中的火灾与共生氮固定之间的关系，之前有文献记载，在长叶松稀树草原中，氮固定无法补充火灾造成的氮损失。在林分年龄和火灾频率的梯度上，我们研究了氮和磷的可用性对固定的影响，并建立了一个营养添加实验，以评估氮和磷对豆科植物生长、固定和菌根投资的影响。我们发现了草本豆科植物受磷限制的明显信号。豆科植物的生长和固定与土壤矿物钾的可用性有关，钾的添加进一步刺激了豆科植物的生长和固定。相比之下，土壤中氮的可用性和氮的添加都不会影响豆科植物的生长或固定。综述。我们的研究结果表明，沙丘长叶松稀树草原中的共生氮固定受土壤钾供应量的控制，而土壤钾供应量因土壤年龄和母质而异。因此，只有当土壤中有足够的钾支持这一过程时，氮的固定才能抵消火灾造成的氮损失。尽管如此，当代长叶松生态系统最近的氮富集可能降低了氮固定作为火灾后恢复机制的重要性。
期刊介绍：
Journal of Ecology publishes original research papers on all aspects of the ecology of plants (including algae), in both aquatic and terrestrial ecosystems. We do not publish papers concerned solely with cultivated plants and agricultural ecosystems. Studies of plant communities, populations or individual species are accepted, as well as studies of the interactions between plants and animals, fungi or bacteria, providing they focus on the ecology of the plants.
We aim to bring important work using any ecological approach (including molecular techniques) to a wide international audience and therefore only publish papers with strong and ecological messages that advance our understanding of ecological principles.
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