Natural Resources Institute Finland, Latokartanonkaari 9, Helsinki, FI-00790, Finland.
Dep. of Forest Ecology and Management, Swedish Univ. of Agricultural Sciences, Umeå, 901 83, Sweden.
J Environ Qual. 2022 Nov;51(6):1211-1221. doi: 10.1002/jeq2.20412. Epub 2022 Oct 12.
Many recent studies have indicated upward trends in carbon and nutrient concentrations from drained peatland forests over time since their initial drainage, but the mechanisms behind these trends are still poorly understood. We gathered data on nitrogen and phosphorus concentrations discharged from 37 drained boreal peatland forests where we also had data on peat and tree stand characteristics. We found that tree stand volume and peat bulk density were positively correlated with the nitrogen and phosphorus concentrations discharged from particularly the deep-peated sites. We interpret these results to indicate that a plausible reason for the reported upward trends in nutrient concentrations is the maturing and growing of the tree stands over time since initial drainage and the consequent increasing evapotranspiration capacity, which results in lowered soil water levels and enhanced aerobic peat mineralization. We discuss how our results should be considered in the management of drained peatland forests.
许多最近的研究表明，自最初排水以来，排水后的泥炭地森林中的碳和营养物浓度随着时间的推移呈上升趋势，但这些趋势背后的机制仍知之甚少。我们收集了 37 个排水的北方泥炭地森林中排放的氮和磷浓度的数据，同时我们也有关于泥炭和树木特征的数据。我们发现，树木体积和泥炭体密度与特别是深泥炭地的氮和磷排放浓度呈正相关。我们解释这些结果表明，报告的营养物浓度上升趋势的一个合理原因是，自最初排水以来，树木随着时间的推移而成熟和生长，随之而来的是蒸腾作用能力的增强，这导致土壤水位下降和增强了好氧泥炭矿化作用。我们讨论了我们的结果在排水泥炭地森林管理中应如何考虑。
