Jolin Émilie, Arsenault Julien, Talbot Julie, Hassan Mahmud, Rochefort Line
Département de Géographie, Université de Montréal, Montréal, Québec, Canada.
Groupe de Recherche Interuniversitaire en Limnologie (GRIL), Montréal, Québec, Canada.
Ecol Appl. 2024 Dec;34(8):e3052. doi: 10.1002/eap.3052. Epub 2024 Oct 11.
In the last 25 years, several degraded peatlands in eastern Canada have been restored toward their natural structure. Pools are common in natural peatlands and are important habitats for unique flora and fauna. Because of their ecological value, pools have been created in some restored peatland sites. Nevertheless, the biogeochemistry of created pools in a restoration context has seldom been studied. The objective of our study is to characterize the biogeochemistry of created pools from restored peatlands and compare them with natural pools along a chronosequence since their creation. We measured different biogeochemical variables (pH, concentrations of nitrogen (N), phosphorus (P), dissolved organic carbon (DOC), dissolved organic matter (DOM), base cations-calcium (Ca), sodium (Na), magnesium (Mg), and potassium (K)-and dissolved gases-methane (CH), carbon dioxide (CO), and nitrous oxide (NO)-) in 61 pools distributed over seven peatlands in eastern Canada. The sites represent a range of conditions, from natural to restored peatlands with pools ranging from 3 to 22 years old. Created and natural pools had distinctive biogeochemistry, with created pools being generally less acidic (pH >5) and 2.5 times more concentrated in nutrients (N and P) than in natural pools. DOC, N, P, dissolved gases, and base cations concentrations were lower in natural pools than in created pools, and varied between created sites. The oldest created pools (age >17 years) tend to approach the biogeochemical characteristics of natural pools, indicating that created pools may, over time, provide habitats with similar conditions to natural pools. A return of created pools to a natural pool-like biogeochemistry could thus inform on the success of peatland restoration.
在过去25年里，加拿大东部的一些退化泥炭地已恢复至其自然结构。水塘在天然泥炭地中很常见，是独特动植物的重要栖息地。由于其生态价值，在一些恢复的泥炭地中建造了水塘。然而，在恢复背景下新建水塘的生物地球化学很少被研究。我们研究的目的是描述恢复泥炭地中新建水塘的生物地球化学特征，并将它们与自形成以来沿时间序列的天然水塘进行比较。我们测量了分布在加拿大东部七个泥炭地的61个水塘中的不同生物地球化学变量（pH值、氮（N）、磷（P）、溶解有机碳（DOC）、溶解有机物（DOM）、碱金属阳离子——钙（Ca）、钠（Na）、镁（Mg）和钾（K）——以及溶解气体——甲烷（CH）、二氧化碳（CO）和一氧化二氮（NO））。这些地点代表了一系列条件，从天然泥炭地到恢复的泥炭地，水塘的年龄从3岁到22岁不等。新建水塘和天然水塘具有独特的生物地球化学特征，新建水塘通常酸性较弱（pH>5），养分（N和P）浓度是天然水塘的2.5倍。天然水塘中的DOC、N、P、溶解气体和碱金属阳离子浓度低于新建水塘，且在不同的新建地点有所不同。最古老的新建水塘（年龄>17年）往往接近天然水塘的生物地球化学特征，这表明随着时间的推移，新建水塘可能会提供与天然水塘条件相似的栖息地。因此，新建水塘恢复到类似天然水塘的生物地球化学状态可以为泥炭地恢复的成功提供依据。
