Ecosystem function responses to nutrient enrichment mediated by mud content in soft sediment habitats

IF 1.4 4区 环境科学与生态学 Q3 FISHERIES
S. Thomas, C. Pilditch, S. Thrush, C. Savage
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引用次数: 1

Abstract

ABSTRACT Estuaries are threatened with increasing sedimentation and nutrients, however research is limited on the interaction of these stressors on ecosystem functions. A field experiment adding nitrogen (N) fertiliser at high (600 g N m−2) and medium (150 g N m−2) concentrations and control plots was established in two sandy and two muddy sites (mud content 0–15%) to investigate context dependency of nitrogen enrichment on nutrient cycling and primary production. There was a significant interaction of mud x treatment on ammonium (NH4 +) fluxes. High N-addition plots had 133x greater dark NH4 + efflux than controls in muddy sediments, compared to 17x greater dark NH4 + efflux in sandy sediments. Net primary production increased with mud content, while photosynthetic efficiency of the microphytobenthos (GPPchl-a ) decreased above 4% mud. Mud content also affected the bivalve, Austrovenus stutchburyi (>30 mm), macrofaunal abundance and functional groups, and their influence on nutrient cycling. Thus minor increases in mud can alter the ecosystem response to nutrient enrichment directly through changes in sediment properties and indirectly by affecting the bivalves and macrofauna that influence these processes. This study highlights how multiple stressors interact to predispose estuaries to tipping points.
软沉积物生境中泥质含量介导的生态系统功能对养分富集的响应
河口受到日益增加的沉积物和营养物质的威胁,但这些压力因素对生态系统功能的相互作用研究有限。在两个沙质和两个泥质场地(含泥量0-15%)建立了高浓度(600 g N m−2)和中浓度(150 g N m−2)氮肥和对照试验,研究氮肥富集对养分循环和初级生产的环境依赖性。泥浆x处理对铵(NH4 +)通量有显著的相互作用。在泥质沉积物中,高n添加样地的深色NH4 +流出量比对照高出133倍,而在砂质沉积物中,深色NH4 +流出量比对照高出17倍。净初级产量随泥浆含量的增加而增加,而微底栖植物光合效率(GPPchl-a)在泥浆含量超过4%时下降。淤泥含量还影响了双壳类动物、大腹阔叶树(Austrovenus stutchburyi, > ~ 30mm)、大型动物丰度、功能群及其对养分循环的影响。因此,泥浆的少量增加可以通过改变沉积物性质直接改变生态系统对营养物富集的反应,并通过影响影响这些过程的双壳类和大型动物间接改变生态系统对营养物富集的反应。这项研究强调了多种压力源如何相互作用,使河口容易达到临界点。
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来源期刊
CiteScore
4.50
自引率
12.50%
发文量
35
审稿时长
3 months
期刊介绍: Aims: The diversity of aquatic environments in the southern continents and oceans is of worldwide interest to researchers and resource managers in research institutions, museums, and other centres. The New Zealand Journal of Marine and Freshwater Research plays an important role in disseminating information on observational, experimental, theoretical and numerical research on the marine, estuarine and freshwater environments of the region.
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