Subsidence, erosion, and degradation in agricultural peatlands are leading to the disappearance of highly fertile farmland. This study investigated two strategies aimed at extending the lifespan of cultivated peat soils: the application of straw and wood chips to compensate for soil losses and the application of copper (Cu) to slow peat decomposition, based on previous recommendations. Peat soil samples (270 g) were amended with 11 t ha^–1 of biomass materials (14.8 g kg^–1) and 235.6 mg Cu kg^–1 and incubated in glass jars at constant temperature and water content. Thirty chemical parameters were then monitored over a 56-d period through repeated soil sampling. Discriminant analysis showed that the addition of biomass had the greatest affect on nitrogen (N) availability, immobilizing 7.8 to 12.1 kg of inorganic N per metric ton of incorporated biomass. Considering that peat soils may require from 4 to 40 t biomass ha^–1 yr^–1 to reach carbon equilibrium, the tested biomass materials could immobilize from 34 to 500 kg ha^–1 of N if confirmed at the field scale. This may help capture excess N but may also limit crop growth. Alternatively, slowing decomposition could reduce both biomass requirements and N immobilization. However, the results show that Cu had little effect on parameters linked to organic matter decomposition. Indeed, dissolved organic carbon was decreased by 11% in Cu-treated soils. A longer-term study should be conducted to confirm these observations at the field scale, thus helping to develop conservation strategies suitable for agricultural production.

中文翻译：

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农业泥炭地保护：植物生物量和铜的添加如何影响土壤肥力？

农业泥炭地的沉降、侵蚀和退化导致高度肥沃的农田消失。本研究调查了两种旨在延长栽培泥炭土壤寿命的策略：根据先前的建议，使用秸秆和木屑来补偿土壤流失，以及使用铜 (Cu) 来减缓泥炭分解。用 11 t ha ^–1生物质材料（14.8 g kg ^–1）和 235.6 mg Cu kg ^–1修正泥炭土壤样品（270 g）并在恒温恒水的玻璃瓶中培养。然后通过重复土壤采样在 56 天的时间内监测了 30 种化学参数。判别分析表明，添加生物质对氮 (N) 可用性的影响最大，每公吨掺入的生物质固定 7.8 至 12.1 千克无机氮。考虑到泥炭土可能需要 4 至 40 t 生物量 ha ^–1  yr ^–1才能达到碳平衡，所测试的生物质材料可以固定 34 至 500 kg ha ^–1N 如果在现场规模确认。这可能有助于捕获过量的氮，但也可能限制作物生长。或者，减缓分解可以减少生物量需求和氮固定。然而，结果表明，Cu 对与有机物分解相关的参数几乎没有影响。事实上，Cu 处理过的土壤中溶解的有机碳减少了 11%。应进行更长期的研究，以确认田间规模的这些观察结果，从而有助于制定适合农业生产的保护策略。