Phosphorus rather than nitrogen regulates ecosystem carbon dynamics after permafrost thaw,Global Change Biology

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Phosphorus rather than nitrogen regulates ecosystem carbon dynamics after permafrost thaw
Global Change Biology ( IF 10.8 ) Pub Date : 2021-08-14 , DOI: 10.1111/gcb.15845
Guibiao Yang _{1,

2} , Yunfeng Peng ₁ , Benjamin W Abbott ₃ , Christina Biasi ₄ , Bin Wei _{1,

2} , Dianye Zhang ₁ , Jun Wang ₁ , Jianchun Yu ₁ , Fei Li ₁ , Guanqin Wang _{1,

2} , Dan Kou _{1,

4} , Futing Liu ₁ , Yuanhe Yang _{1,

2}

Affiliation

Ecosystem carbon (C) dynamics after permafrost thaw depends on more than just climate change since soil nutrient status may also impact ecosystem C balance. It has been advocated that nitrogen (N) release upon permafrost thaw could promote plant growth and thus offset soil C loss. However, compared with the widely accepted C-N interactions, little is known about the potential role of soil phosphorus (P) availability. We combined 3-year field observations along a thaw sequence (constituted by four thaw stages, i.e., non-collapse and 5, 14, and 22 years since collapse) with an in-situ fertilization experiment (included N and P additions at the level of 10 g N m⁻² year⁻¹ and 10 g P m⁻² year⁻¹) to evaluate ecosystem C-nutrient interactions upon permafrost thaw. We found that changes in soil P availability rather than N availability played an important role in regulating gross primary productivity and net ecosystem productivity along the thaw sequence. The fertilization experiment confirmed that P addition had stronger effects on plant growth than N addition in this permafrost ecosystem. These two lines of evidence highlight the crucial role of soil P availability in altering the trajectory of permafrost C cycle under climate warming.

中文翻译：

磷而不是氮在多年冻土融化后调节生态系统碳动态

永久冻土融化后的生态系统碳 (C) 动态不仅仅取决于气候变化，因为土壤养分状况也可能影响生态系统碳平衡。一直主张在永久冻土解冻时释放氮 (N) 可以促进植物生长，从而抵消土壤碳损失。然而，与广泛接受的 CN 相互作用相比，人们对土壤磷 (P) 有效性的潜在作用知之甚少。我们将沿着解冻序列的 3 年实地观察（由四个解冻阶段组成，即非塌陷和塌陷后的 5、14 和 22 年）与原位施肥试验（包括在水平上添加 N 和 P 10 g N m ^-2 年^-1和 10 g P m ^-2 年^-1) 评估永久冻土融化后生态系统 C-养分的相互作用。我们发现土壤磷素有效性而非氮素有效性的变化在沿着解冻序列调节总初级生产力和净生态系统生产力方面发挥着重要作用。施肥试验证实，在该多年冻土生态系统中，磷的添加对植物生长的影响大于氮的添加。这两条证据突出了土壤磷的有效性在气候变暖下改变永久冻土碳循环轨迹的关键作用。

更新日期：2021-10-15

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