溪流红叶植物促进了高寡养水源地的 "隐性 "生产力

IF 3.8 1区 地球科学 Q1 LIMNOLOGY
Audrey N. Thellman, Tammy Wooster, Heather Malcom, Emma J. Rosi, Emily S. Bernhardt
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引用次数: 0

摘要

根据最近的观测记录,哈伯德布鲁克实验森林(HBEF)上游溪流中的藻类数量有所增加。HBEF 溪流 "变绿 "的原因可能是气候变化,气温升高,陆地物候发生变化,水文系统发生变化。另外,溪流 "变绿 "也可能是由于几十年的酸雨导致 pH 值升高、有毒 Al3+ 浓度下降以及溶质浓度降低,从而导致溪流化学性质恢复缓慢。四年来,我们每周在人工苔藓和瓷片上进行藻类测量,并进行了六次营养富集实验,从而对这两种自养生物之间的相互作用有了新的认识。我们发现,在受保护的堰塘和河道中,人工苔藓基质上的藻类生物量高于瓷砖上的藻类生物量--这种效应在河道中被放大。这些结果表明,苔藓植物可以提供物理保护,防止洪水冲刷,也可以截留养分,支持藻类生长。在河道中,光照充足的栖息地和光照强烈的时段藻类生物量较高。我们仅在堰塘内进行的营养物质富集实验中测量了氮和磷对藻类生物量的限制,堰塘内的光照度较高,流量较小。相比之下,其余四项溪流实验的结果几乎没有提供营养物质限制的证据,只有一项试验显示藻类的生长因营养物质的添加而增加。我们的研究最突出的意义在于,在阴暗和低营养的源头溪流中,红叶植物在为藻类提供庇护所和潜在营养物质方面发挥着重要作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Stream bryophytes promote “cryptic” productivity in highly oligotrophic headwaters
Recent observations document increased abundance of algae in the headwater streams of Hubbard Brook Experimental Forest (HBEF). It is possible that this “greening up” of HBEF streams may be due to climate change, with rising temperatures, altering terrestrial phenology, and shifting hydrologic regimes. Alternatively, stream “greening” could be from the slow recovery of stream chemistry after decades of acid rain, which has led to rising pH, declining concentrations of toxic Al3+, and low solute concentrations. Four years of weekly algal measurements on artificial moss and ceramic tiles, along with six nutrient enrichment experiments, revealed new insights about the interactions between these two autotrophs. We found that in protected weir ponds and in stream channels, algal biomass was higher on artificial moss substrates than on tiles—with this effect amplified in the stream channels. These results suggest that bryophytes can provide physical protection from flood scour or may trap nutrients to support algal growth. In stream channels, algal biomass was higher in well‐lit habitats and time periods indicating strong light limitation. We only measured nitrogen and phosphorus limitation of algal biomass in nutrient enrichment experiments conducted within weir ponds, with higher light availability and lower flow. By comparison, results from the remaining four instream experiments provided little evidence for nutrient limitation, with only one trial showing increased algal growth in response to nutrient addition. The most striking implication of our study is the role of bryophytes in providing refugia, and potentially nutrients, to algae in shaded and oligotrophic headwater streams.
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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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