Rewet without regret? Nutrient dynamics in fen peat exposed to different rewetting degrees

IF 3.9 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Annick van der Laan, Jerry van Dijk, Karin T. Rebel, Martin J. Wassen
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Abstract

All over the world, peatlands have been drained, often for agricultural purposes, resulting in CO2 emissions, soil subsidence and biodiversity loss. To combat these negative effects, drained peatlands are being rewetted, but knowledge of the effects of rewetting on peat biogeochemistry is still incomplete, especially since a variety of rewetting methods and rewetting degrees exists. We conducted a mesocosm experiment in which we exposed 100 intact agricultural fen peat cores (80 cm, 20 cm Ø) to five different water levels (0, 20, 40, 60 cm and variable—surface), two nutrient application levels to mimic continued agricultural use, and two water origins. Over an eight-month period, we harvested above-ground plant biomass five times and sampled pore water at two depths each month. Samples were analysed for nutrients. Our results show increased phosphate and ammonium availability upon fully rewetting (0 cm—surface) and less so under partially rewetted circumstances (20 cm—surface). Above-ground biomass was strongly affected by nutrient application, especially in the high water level treatments. Vegetation was primarily N-limited, and N in the vegetation decreased with increasing water levels, indicating stronger nitrogen limitation upon rewetting. We conclude that nature restoration under fully rewetted conditions will likely be challenging as a result of the large release of nutrients from the system which may also affect surrounding nature areas. Furthermore, we conclude that partial rewetting combined with low-intensity agricultural use can be a solution to slow down the adverse effects of drainage, although this will lead to decreased agricultural production.

Abstract Image

复湿无悔?暴露于不同复湿程度的沼泽泥炭中的营养动态
全世界的泥炭地都被抽干了,通常是为了农业目的,这导致了二氧化碳排放、土壤退化和生物多样性丧失。为了消除这些负面影响,人们正在对干涸的泥炭地进行复湿,但有关复湿对泥炭生物地球化学影响的知识仍不完整,特别是由于存在多种复湿方法和复湿程度。我们进行了一项中型宇宙实验,将 100 个完整的农田沼泽泥炭芯(80 厘米,直径 20 厘米)置于五种不同的水位(0、20、40、60 厘米和可变表面)、两种养分施用水平(模拟持续农业使用)和两种水源之下。在八个月的时间里,我们采集了五次地上植物生物量,并每月在两个深度采集孔隙水样本。我们对样本进行了养分分析。我们的结果表明,在完全复湿(0 厘米表面)的情况下,磷酸盐和铵的供应量增加,而在部分复湿(20 厘米表面)的情况下,磷酸盐和铵的供应量则减少。地上生物量受施用养分的影响很大,尤其是在高水位处理中。植被主要受氮限制,植被中的氮随水位的增加而减少,这表明复湿后的氮限制更强。我们的结论是,在完全复湿的条件下进行自然恢复很可能会面临挑战,因为系统会释放出大量养分,这也可能会影响到周围的自然区域。此外,我们还得出结论,部分复湿与低强度农业利用相结合,可以减缓排水的不利影响,尽管这会导致农业减产。
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来源期刊
Biogeochemistry
Biogeochemistry 环境科学-地球科学综合
CiteScore
7.10
自引率
5.00%
发文量
112
审稿时长
3.2 months
期刊介绍: Biogeochemistry publishes original and synthetic papers dealing with biotic controls on the chemistry of the environment, or with the geochemical control of the structure and function of ecosystems. Cycles are considered, either of individual elements or of specific classes of natural or anthropogenic compounds in ecosystems. Particular emphasis is given to coupled interactions of element cycles. The journal spans from the molecular to global scales to elucidate the mechanisms driving patterns in biogeochemical cycles through space and time. Studies on both natural and artificial ecosystems are published when they contribute to a general understanding of biogeochemistry.
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