Differential effects of press vs. pulse seawater intrusion on microbial communities of a tidal freshwater marsh
Differential effects of press vs. pulse seawater intrusion on microbial communities of a tidal freshwater marsh
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压力和脉冲海水入侵对潮汐淡水沼泽微生物群落的不同影响
DOI：
10.1002/lol2.10171
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发表时间：
2020-11
影响因子：
7.8
通讯作者：
Courtney Mobilian;Nathan I. Wisnoski;J. Lennon;M. Alber;Sarah E. Widney;C. Craft
中科院分区：
文献类型：
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作者：
Courtney Mobilian;Nathan I. Wisnoski;J. Lennon;M. Alber;Sarah E. Widney;C. Craft
潮汐淡水沼泽受到海水入侵的威胁，影响微生物群落，改变生物地球化学过程。在这里，我们报告了一项长期的、大规模的可操作的野外实验，研究了连续（按压）和间歇（脉冲，2个月/年）输入微咸水对TFM中微生物群落的影响。2.5年后，按压处理的微生物多样性低于对照（未处理）地块，而脉冲地块的多样性不受添加微咸水的影响。硫酸盐还原剂丰度在按压和脉冲处理下均有增加，而产甲烷菌丰度在不同处理下无差异。我们的研究结果，以及其他实验室和现场测量结果表明，土壤呼吸和细胞外酶活性的降低表明，持续的海水入侵将减少大型植物C的输入，从而减少细菌多样性，从而减少生态系统的碳循环。
Tidal freshwater marshes (TFMs) are threatened by seawater intrusion, which can affect microbial communities and alter biogeochemical processes. Here, we report on a long‐term, large‐scale manipulative field experiment that investigated continuous (press) and episodic (pulse, 2 months/yr) inputs of brackish water on microbial communities in a TFM. After 2.5 yr, microbial diversity was lower in press treatments than in control (untreated) plots whereas diversity in pulse plots was unaffected by brackish water additions. Sulfate reducer abundance increased in response to both press and pulse treatments whereas methanogens did not differ among treatments. Our results, along with other lab and field measurements that show reduced soil respiration and extracellular enzyme activity suggest that continuous seawater intrusion will decrease macrophyte C inputs that reduce bacterial diversity in ways that also diminish ecosystem carbon cycling.