/pdf/food-and-agricultural-organization-of-the-united-nations-151qubr5t3.pdf

Food and Agricultural Organization of the United Nations.

Stelios Katsanevakis*, Inger Wallentinus, Argyro Zenetos, Erkki Leppakoski, Melih Ertan Cinar, Bayram Ozturk, Michal Grabowski, Daniel Golani and Ana Cristina Cardoso European Commission, Joint Research Centre (JRC), Institute for Environment and Sustainability (IES), Ispra, Italy Department of Biological and Environmental Sciences, University of Gothenburg, Sweden Institute of Marine Biological Resources and Inland Waters, Hellenic Centre for Marine Research, Ag. Kosmas, Greece Department of Biosciences, Environmental and Marine Biology, Abo Akademi University, Turku, Finland Ege University, Faculty of Fisheries, Department of Hydrobiology, Bornova, Izmir, Turkey Faculty of Fisheries, Marine Biology Laboratory, University of Istanbul, Istanbul, Turkey Department of Invertebrate Zoology & Hydrobiology, University of Lodz, Poland Department of Ecology, Evolution and Behavior and the National Natural History Collections, The Hebrew University of Jerusalem, Israel

/pdf/impacts-of-invasive-alien-marine-species-on-ecosystem-2h02ykurnj.pdf

Impacts of invasive alien marine species on ecosystem services and biodiversity: a pan-European review.

The soil carbon.

https://biblioteca.cehum.org/bitstream/123456789/1086/1/Meng%2c%20He%2c%20Hu%2c%20Mo.%20Status%20of%20wetlands%20in%20China%2c%20A%20review%20of%20extent%2c%20degradation%2c%20issues%20and%20recommendations%20for%20improvement.pdf

Status of wetlands in China: A review of extent, degradation, issues and recommendations for improvement

Coastal salt marshes are sensitive to global climate change and may play an important role in mitigating global warming. To evaluate the impacts of Spartina alterniflora invasion on global warming potential (GWP) in Chinese coastal areas, we measured CH4 and N2O fluxes and soil organic carbon sequestration rates along a transect of coastal wetlands in Jiangsu province, China, including open water; bare tidal flat; and invasive S. alterniflora, native Suaeda salsa, and Phragmites australis marshes. Annual CH4 emissions were estimated as 2.81, 4.16, 4.88, 10.79, and 16.98 kg CH4 ha(-1) for open water, bare tidal flat, and P. australis, S. salsa, and S. alterniflora marshes, respectively, indicating that S. alterniflora invasion increased CH4 emissions by 57-505%. In contrast, negative N2O fluxes were found to be significantly and negatively correlated (P < 0.001) with net ecosystem CO2 exchange during the growing season in S. alterniflora and P. australis marshes. Annual N2O emissions were 0.24, 0.38, and 0.56 kg N2O ha(-1) in open water, bare tidal flat and S. salsa marsh, respectively, compared with -0.51 kg N2O ha(-1) for S. alterniflora marsh and -0.25 kg N2O ha(-1) for P. australis marsh. The carbon sequestration rate of S. alterniflora marsh amounted to 3.16 Mg C ha(-1) yr(-1) in the top 100 cm soil profile, a value that was 2.63- to 8.78-fold higher than in native plant marshes. The estimated GWP was 1.78, -0.60, -4.09, and -1.14 Mg CO2 eq ha(-1) yr(-1) in open water, bare tidal flat, P. australis marsh and S. salsa marsh, respectively, but dropped to -11.30 Mg CO2 eq ha(-1) yr(-1) in S. alterniflora marsh. Our results indicate that although S. alterniflora invasion stimulates CH4 emissions, it can efficiently mitigate increases in atmospheric CO2 and N2O along the coast of China.

Exotic Spartina alterniflora invasion alters ecosystem-atmosphere exchange of CH4 and N2O and carbon sequestration in a coastal salt marsh in China

To better understand how seasonal change and the presence of plants affect biogeochemical iron (Fe) cycling in tidal marsh sediments, we examined the seasonal dynamics of microbial Fe reduction (FeR) and related Fe speciation from 2012 to 2014 using in situ vegetated and unvegetated mesocosms created with macrobenthos-proof enclosures. The pools of Fe(III) oxides, Fe sulfides, porewater Fe2+, and rates of microbial sulfate reduction (SR) peaked in summer (hot and wet), whereas rates of FeR and non-sulfidic Fe(II) levels peaked in winter (mild and dry). Sedge presence greatly increased the FeR rate, organic matter pools, and Fe(III) oxide levels, but decreased carbon:nitrogen ratios and sulfide abundances. FeR rates were mainly affected by the SR level, and temperature and plant primary productivity had comparable effects on SR rates. The dominant organic carbon mineralization pathway changed from SR in summer to FeR in winter in both vegetated and unvegetated mesocosms. FeR was more important in the vegetated mesocosms than in the unvegetated mesocosms, and seasonal change contributed more to the total variability of each anaerobic pathway than the presence of sedge. Our study reveals that temperature and plants both mediate variations in the organic carbon mineralization pathways of a subtropical estuarine tidal marsh.

/pdf/iron-dynamics-in-a-subtropical-estuarine-tidal-marsh-effect-518dfzloje.pdf

Iron dynamics in a subtropical estuarine tidal marsh: effect of season and vegetation

In order to accurately estimate the effects of tidal scenarios on the CH4 emission from tidal wetlands, we examined the CH4 effluxes, dissolved CH4 concentrations, and environmental factors (including in situ pH, Eh and electrical conductivity, porewater SO42−, NO3−, and NH4+) during inundation and air-exposure periods in high- and low-tide seasons in the Min River Estuary in southeast China. By applying static and floating chambers, our results showed that the CH4 effluxes during the inundation periods were relatively constant and generally lower than those during the air-exposed periods in both seasons. When compared, the CH4 effluxes during the air-exposed periods were significantly higher in the high-tide season than those in the low-tide season. In contrast, CH4 effluxes during the inundation periods were significantly lower in the high-tide season than those in the low-tide season. During the inundation periods, dissolved CH4 concentrations were inversely proportional to in situ Eh. Under air-exposed conditions, CH4 effluxes were proportional to in situ pH in both seasons, while the dissolved CH4 concentrations were negatively correlated with the porewater SO42− concentrations in both seasons. Our results highlighted that CH4 effluxes were more dynamic between inundation and air-exposure periods compared to low- and high-tide seasons.

Effects of Tidal Scenarios on the Methane Emission Dynamics in the Subtropical Tidal Marshes of the Min River Estuary in Southeast China.

Diffusive CH4 fluxes from aquaculture ponds using floating chambers and thin boundary layer equations

Low-level saltwater intrusion and ferric iron (Fe(III)) loading are predicted for many mineral tidal freshwater ecosystems under sea-level rise. To assess their effects on the carbon mineralization processes, in-situ experiments were conducted with four treatments: Fe(III) amendment, saltwater addition, saltwater addition plus Fe(III) amendment, and a control. Soil and porewater samples (0–30 cm) were collected to assess geochemical properties and soil incubation on Days 460 and 580 after the start of the experiment. Saltwater addition increased the salinity from freshwater (0.1 mg·g−1) to oligohaline (

Carbon mineralization in tidal freshwater marsh soils at the intersection of low-level saltwater intrusion and ferric iron loading

Greenhouse gas fluxes and porewater geochemistry following short-term pulses of saltwater and Fe(III) in a subtropical tidal freshwater estuarine marsh

Jiafang Huang

Papers

Iron dynamics in a subtropical estuarine tidal marsh: effect of season and vegetation

Effects of Tidal Scenarios on the Methane Emission Dynamics in the Subtropical Tidal Marshes of the Min River Estuary in Southeast China.

Diffusive CH4 fluxes from aquaculture ponds using floating chambers and thin boundary layer equations

Carbon mineralization in tidal freshwater marsh soils at the intersection of low-level saltwater intrusion and ferric iron loading

Greenhouse gas fluxes and porewater geochemistry following short-term pulses of saltwater and Fe(III) in a subtropical tidal freshwater estuarine marsh