Nitrogen and Phosphorus Uptake Stoichiometry Tracks Supply Ratio During 2-year Whole-Ecosystem Nutrient Additions
Nitrogen and Phosphorus Uptake Stoichiometry Tracks Supply Ratio During 2-year Whole-Ecosystem Nutrient Additions
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氮和磷吸收化学计量跟踪 2 年全生态系统养分添加期间的供应比率
DOI：
10.1007/s10021-022-00813-1
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发表时间：
2023
期刊：
影响因子：
3.7
通讯作者：
Helton, Ashley M.
中科院分区：
文献类型：
--
作者：
Tomczyk, Nathan J.;Rosemond, Amy D.;Kominoski, John S.;Manning, David W.;Benstead, Jonathan P.;Gulis, Vladislav;Thomas, Steven A.;Hotchkiss, Erin R.;Helton, Ashley M.
养分吸收、储存和释放是影响碳加工和食物网动态的关键生态系统功能。然而，控制生态系统何时成为净汇或养分来源的机制尚不确定。具体而言，养分供应比率如何改变净养分吸收和释放的速率和比率尚不清楚。为了评估净氮（N）和磷（P）的吸收和释放是否与供应N：P有关，我们在不同的N：P（目标摩尔N：P范围为2：1-128：1）实验富集了5个森林溪流2年。我们量化的净养分交换（NNE）之间的差异，预期的N和P通量假设保守的运输（背景浓度加上实验输入）和观察到的营养盐通量在下游端的每个实验流达到。供应N：P并不影响NNE的大小为N或P，但净N和P吸收的可能性是最大的中间N：P供应（N：P = 99：1和55：1，分别）。溪流的N：P吸收和释放具有很高的灵活性;每条溪流内NNEN和NNEP之间的斜率随着供应N：P的增加而增加。此外，供应N：P与吸收和释放N：P之间的斜率接近1（分别为0.98 ± 0.06 SE和0.82 ± 0.13 SE），表明具有很高的灵活性。总的来说，我们发现更大的化学计量的灵活性比已经在短期营养素添加实验中所示。我们认为，这种灵活性的结果，在生物膜或社区结构的变化，这可能需要更长的时间来体现比短期实验的持续时间内的营养循环的变化。
Nutrient uptake, storage, and release are critical ecosystem functions that affect carbon processing and food web dynamics. Yet, mechanisms controlling when ecosystems are net sinks or sources of nutrients are uncertain. Specifically, how nutrient supply ratios alter rates and ratios of net nutrient uptake and release is unclear. To assess whether net nitrogen (N) and phosphorus (P) uptake and release are linked to supply N:P, we experimentally enriched five forest streams at different N:P (target molar N:P range 2:1–128:1) for 2 years. We quantified net nutrient exchange (NNE) as the difference between the expected N and P fluxes assuming conservative transport (background concentrations plus experimental inputs) and the observed nutrient fluxes at the downstream end of each experimental stream reach. Supply N:P did not affect the magnitude of NNE for either N or P, but the likelihood of net N and P uptake was greatest at intermediate N:P supply (N:P = 99:1 and 55:1, respectively). Streams appeared to be highly flexible in their N:P uptake and release; the slopes between NNENand NNEPwithin each stream increased with supply N:P. Furthermore, slopes comparing supply N:P to uptake and release N:P were near one (0.98 ± 0.06 SE and 0.82 ± 0.13 SE, respectively), indicating a high degree of flexibility. Overall, we found greater stoichiometric flexibility than has been shown in short-term nutrient-addition experiments. We suggest that this flexibility results from changes in nutrient recycling within biofilms or changes in community structure, which may take longer to manifest than the duration of shorter-term experiments.
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