Effects of Spartina alterniflora Invasion on Soil Respiration in the Yangtze River Estuary, China

Bu, Naishun; Qu, Jianhua; Li, Zhaolei; Li, Gang; Hua, Zhao; Zhao, Bin; Li, Bo; Chen, Jiakuan; Fang, Changming

doi:10.1371/journal.pone.0121571

Cited by 38 publications

(13 citation statements)

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“…Compared with the native plants of Suaeda salsa , the Spartina invasion increases the soil organic carbon (SOC) content by 27.0%-69.6%, and increases ecosystem primary productivity and carbon sequestration capacity significantly [35]. But Bu et al indicated that Spartina invasion does not change SOC significantly [36]. The Spartina invasion increases carbon reserves in the rhizosphere soil of reed wetland [37].…”

Section: Discussionmentioning

confidence: 99%

Effects of Spartina alterniflora Invasion on Soil Quality in Coastal Wetland of Beibu Gulf of South China

et al. 2016

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BackgroundSince Spartina alterniflora (simplified as Spartina) has strong ecological competitiveness and rapid growth, it has been introduced and living in the coastal wetland regions of China for more than 30 years. Taking coastal wetland in the Beibu Gulf of south China as an example, the effects of Spartina invasion on soil quality were investigated to provide scientific basis for soil management.MethodologyThe soil quality of six different coastal wetlands, i.e. mangrove (vegetation coverage is above 95%), mangrove- Spartina ecotones (vegetation coverage is above 95%), sparse mangrove (vegetation coverage is 10%-20%), sparse mangrove- Spartina ecotones (vegetation coverage is about 80%), Spartina (vegetation coverage is about 80%) and bare beach (no plants), were analyzed using the following indicators: pH, cation exchange capacity, contents of total nitrogen, total phosphorus and organic carbon, microbial biomass carbon, microbial biomass nitrogen, microbial carbon / organic carbon, and activities of urease, acid phosphatase, invertase, polyphenol oxidase and catalase.Principal FindingsThe results showed that compared to mangrove wetland, most indicators in the mangrove-Spartina wetland showed a decline tendency except pH value, and the contents of total phosphorus and organic carbon, microbial biomass carbon and soil microbial biomass nitrogen, and the activities of acid phosphatase and invertase were significantly reduced (P<0.05). Compared to sparse mangrove wetland and bare beach, the Spartina invasion wetland (sparse mangrove-Spartina wetland and Spartina wetland) had higher contents of total nitrogen, total phosphorus and organic carbon, microbial biomass carbon, microbial biomass nitrogen, cation exchange capacity and the activities of urease and acid phosphatase, so soil quality in the sparse mangrove wetland and bare beach was significantly improved. Factor Analysis and PCA also showed that: the quality of mangrove wetland soil is better than that of mangrove-Spartina ecotones wetland soil; the quality of sparse mangrove-Spartina ecotones wetland soil is better than that of sparse mangrove wetland soil; the quality of Spartina wetland soil is better than that of bare beach wetland soil.Conclusions/SignificanceTherefore, in the invaded Beibu Gulf wetland ecosystems of south China, for the mangrove wetlands where the productivity of native plant was higher than that of Spartina, the Spartina invasion can cause soil degradation significantly and it must be strictly controlled, while for sparse mangrove wetland and bare beach where the productivity of native plant was lower than that of Spartina, Spartina invasion can improve the soil quality. Thus our study may help to better understand the effect of plant invasion.

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Section: Discussionmentioning

confidence: 99%

Effects of Spartina alterniflora Invasion on Soil Quality in Coastal Wetland of Beibu Gulf of South China

et al. 2016

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“…After its initial appearance on the Chongming Island located in the Yangtze River estuary in mid-1990′s, it has replaced native Phragmites australis and Scirpus mariqueter and becomes a dominant plant species there 11 . S. alterniflora invasion changes soil microorganism community 14 15 and stimulates greenhouse gas fluxes 16 . S. alterniflora invasion also increases soil C and N pool sizes 17 .…”

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confidence: 99%

Responses of soil nitrogen fixation to Spartina alterniflora invasion and nitrogen addition in a Chinese salt marsh

Huang

Wang

et al. 2016

Sci Rep

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Biological nitrogen fixation (BNF) is the major natural process of nitrogen (N) input to ecosystems. To understand how plant invasion and N enrichment affect BNF, we compared soil N-fixation rates and N-fixing microbes (NFM) of an invasive Spartina alterniflora community and a native Phragmites australis community in the Yangtze River estuary, with and without N addition. Our results indicated that plant invasion relative to N enrichment had a greater influence on BNF. At each N level, the S. alterniflora community had a higher soil N-fixation rate but a lower diversity of the nifH gene in comparison with the native community. The S. alterniflora community with N addition had the highest soil N-fixation rate and the nifH gene abundance across all treatments. Our results suggest that S. alterniflora invasion can increase soil N fixation in the high N-loading estuarine ecosystem, and thus may further mediate soil N availability.

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“…Error bars in SRR indicate the mean ± 1 SD from triplicate cores. labile organic compounds (i.e., DOC) (Bu et al, 2015;Cheng et al, 2008;Zhang et al, 2017), which fuel anaerobic respiration in the sediment (Hines et al, 1989;Hines, 1991;Kostka et al, 2002a;Koretsky et al, 2008). Indeed, depth-integrated (0-20 cm) DOC concentrations at SA (560 mmol m −2 ) were 2.2 times and 2.9 times higher than that measured at SJ (258 mmol m −2 ) and UMF (192 mmol m −2 ), respectively ( Table 2).…”

Section: Influence Of Invasive S Anglica On C Org Oxidationmentioning

confidence: 94%

“…Previous studies have reported that invasion of Spartina species remarkably altered sedimentary biogeochemical cycles (Liao et al, 2007;Cheng et al, 2008;Zhang et al, 2017;Wang et al, 2019), physico-chemical properties of sediment Bu et al, 2015;Zhang et al, 2019), and microbial communities in sediments associated with nitrification and denitrification (Dollhopf et al, 2005;Zhang et al, 2013;Gao et al, 2019), sulfur-oxidizing and reducing processes (Thomas et al, 2014;Cui et al, 2017) and CH 4 emissions (Yuan et al, 2016). However, little is known about the impact of these invading salt marsh plants on biogeochemical processes and associated microbial communities in the Ganghwa intertidal flats of the Han River estuary in the Yellow Sea.…”

Section: Introductionmentioning

confidence: 99%

Invasive Spartina anglica Greatly Alters the Rates and Pathways of Organic Carbon Oxidation and Associated Microbial Communities in an Intertidal Wetland of the Han River Estuary, Yellow Sea

Cho

Jung

et al. 2020

Front. Mar. Sci.

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Biogeochemical process studies and molecular microbiological analyses were applied to assess the effect of invasive Spartina anglica (SA) on organic carbon (C org ) oxidation pathways and microbial community structures in intertidal sediments vegetated by the indigenous marsh plant Suaeda japonica (SJ) and unvegetated mud flats (UMF). Invasive S. anglica possessed 10 times the below-ground biomass of native S. japonica, which was responsible for releasing a substantial amount of labile dissolved organic matter and creating relatively oxidized conditions at the SA site. As a result, microbial metabolic activities measured by rates of anaerobic C org oxidation, iron reduction (FeR) and sulfate reduction (SR) appeared to be greater at SA site compared with the SJ and UMF sites. SR was the dominant anaerobic respiration pathway at a depth of 0-10 cm for vegetated sediments, but the contribution of FeR to C org oxidation was exceptionally high in the rhizosphere of the vegetated sites, comprising 60% and 70% of anaerobic C org oxidation of SA and SJ, respectively. The iron turnover rate at the rhizosphere was 3 times higher at SA site (0.063 d −1 ) compared with the SJ site (0.023 d −1 ), indicating that the denser root system of invasive S. anglica greatly accelerates iron cycling. Bacterial communities based on 16S rRNA genes analysis revealed that members in Desulfuromonadaceae related to the reduction of FeOOH and S 0 were highly abundant at the relatively oxidized SA site, whereas Desulfobulbaceae, which are known as sulfate reducers, were more dominant at the relatively reduced SJ site. Similarly, two sulfur-oxidizing bacteria groups with different eco-physiological strategies thrived in each of the two vegetated sites. Thioprofundaceae in the Gammaproteobacteria were the predominant S-oxidizers at the less-reduced SA site, whereas Sulfurovum in the Epsilonproteobacteria dominated at the relatively reduced SJ site. Our results suggest that an invasion of tall S. anglica and its subsequent displacement of native S. japonica would greatly alter the biogeochemical C-Fe-S cycles and associated microbial communities, which ultimately generate multidirectional variations in ecological and biogeochemical processes in coastal ecosystems.

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Effects of Spartina alterniflora Invasion on Soil Respiration in the Yangtze River Estuary, China

Cited by 38 publications

References 64 publications

Effects of Spartina alterniflora Invasion on Soil Quality in Coastal Wetland of Beibu Gulf of South China

Effects of Spartina alterniflora Invasion on Soil Quality in Coastal Wetland of Beibu Gulf of South China

Responses of soil nitrogen fixation to Spartina alterniflora invasion and nitrogen addition in a Chinese salt marsh

Invasive Spartina anglica Greatly Alters the Rates and Pathways of Organic Carbon Oxidation and Associated Microbial Communities in an Intertidal Wetland of the Han River Estuary, Yellow Sea

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