通过溶解无机碳途径为湿地食物网提供陆地支持

IF 3.8 1区 地球科学 Q1 LIMNOLOGY
Junna Wang, John R. Durand, Sharon P. Lawler, Pin‐Yuan Chen, Xiaoli Dong
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引用次数: 0

摘要

对陆地支持水生食物网的研究主要集中于动物和微生物消费者直接利用的陆地有机物(t-OM)。然而,t-OM 释放的溶解无机碳(DIC)也可能支持水生初级生产者,这是浮游动物和上层营养级的关键资源。通过对六块季节性湿地的藻类、浮游动物、陆地碎屑、沉积物、溶解有机物和颗粒有机物进行两年的 13C 测量,我们发现,在一月份藻类浓度较低时,浮游动物会直接利用 t-OM 或分解 t-OM 的异养微生物、而在 3 月和 5 月,浮游动物主要以藻类为基础资源,藻类则利用 t-OM 矿化和甲烷化产生的 DIC,这表明水生食物网的陆生支持途径是 DIC。床层沉积物和水体中丰富的 t-OM 分解产生了高浓度的 DIC。尽管被藻类吸收,但 1 月和 3 月产生的 DIC 中约有一半最终以 CO2 的形式排放到大气中。这一发现揭示了 t-OM 在维持水生食物网的生产力和稳定性以及造成全球碳排放方面的双重作用。这种双重作用为同时减少碳排放和保护季节性湿地生物群落带来了挑战。最后,观察到 DIC 中的δ13C 存在很大的季节性差异(-12.4‰ 到 6.7‰),这主要是由空气-水 CO2 交换和光合作用驱动的,这表明 13C 可能是研究广泛存在但研究不足的浅层、临时淡水生态系统碳循环的有力工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Terrestrial support of wetland food webs via a dissolved inorganic carbon pathway
Studies of terrestrial support of aquatic food webs have focused primarily on terrestrial organic matter (t‐OM) directly used by animal and microbial consumers. However, dissolved inorganic carbon (DIC) released from t‐OM might also support aquatic primary producers, a key resource for zooplankton and upper trophic levels. Using 2‐yr 13C measurements of algae, zooplankton, terrestrial detritus, sediments, dissolved and particulate organic matter from six seasonal wetlands, we found that in January when algal concentration was low, zooplankton used t‐OM directly or heterotrophic microbes that decompose t‐OM, but in March and May zooplankton was mainly supported by algae as their basal resources, and the algae used DIC derived from the mineralization and methanogenesis of t‐OM, suggesting the DIC pathway of terrestrial support of aquatic food webs. The decomposition of abundant t‐OM from both bed sediments and water column caused high concentrations of DIC. Despite uptake by algae, about half of DIC produced in January and March ended up as emissions to the atmosphere in the form of CO2. This finding revealed the dual roles of t‐OM in maintaining the productivity and stability of aquatic food webs and in contributing to global carbon emissions. This duality poses challenges for simultaneously mitigating carbon emissions and conserving biological communities in seasonal wetlands. Finally, wide seasonal differences in δ13C in DIC (−12.4‰ to 6.7‰) were observed, mainly driven by air–water CO2 exchange and photosynthesis, suggesting that 13C may be a powerful tool to investigate carbon cycling in shallow, temporary freshwater ecosystems that are widespread but understudied.
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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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