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Decomposition processes in coastal wetlands: the importance of Suaeda salsa community for soil cellulose decomposition

100%

Ping Y., Cui L., Pan X., Li W., Li Y., Kang X., Song T., He P.

Polish Journal of Ecology

2018

tom 66

nr 3

Coastal wetlands are ecologically important all over the world, and they are relatively unstable with dramatic changes in aboveground vegetation. However, it is still unclear how the aboveground vegetation changes will influence the functioning of coastal wetland ecosystems, especially the decomposition processes. Here, we carried out a cotton strip experiment to examine the effects of Suaeda salsa community on the soil properties and the associated cellulose decomposition rates in the coastal wetlands of Liao River delta (NE China). Our results showed that S. salsa community significantly affected the contents of soil C, N, P, base cations, organic matter and the soil electrical conductivity (EC), and such effects might vary among different types or densities of aboveground vegetation. The soil cellulose decomposition rate (in terms of cotton strip tensile strength loss, CTSL) was slowed down when aboveground S. salsa communities are experiencing degradation or have been totally replaced by Phragmites australis communities. Moreover, there were positive partial correlations between soil N and CTSL, and between soil EC and CTSL, but a negative partial correlation between soil C and CTSL. Our results emphasized the importance of S. salsa community in determining the soil cellulose decomposition rate in this coastal region. The results suggest that vegetation degradation in coastal wetlands might lead to various changes in soil properties and hence affect other aspects of ecosystem functioning and services, especially nutrient cycling.

The response of wetland plant communities to disturbance: alleviation through symmetric disturbance and facilitation

100%

Xu F., Li M., Zhou D., Liu X., Wang R., Guo W.

Polish Journal of Ecology

2016

tom 64

nr 3

The study pays attention to disturbances in early successional communities of wetland vegetation. We conducted artificial disturbances in a community of Suaeda salsa and Phragmites australis in the Yellow River Delta (China). Eight types of disturbances combining mowing treatments with species treatments were applied. Removal of the standing litters of P. australis or not was defined as mowing treatments, and removal of two species solo or both was defined as species treatments. We sampled 80 quadrats from the treatments plots at different intervals after the disturbance to investigate plant height, abundance, aboveground biomass, the distance between plants to reflect the effect of disturbance on composition, structure, productivity, and function of the plant communities. The strategies of seedling emergence and height growth differed as the canopy changed. Biomass contribution of different species, combined with disturbance intensity, was the main factors that affected the productivity. Homogeneity of disturbance was better for maintaining the functions of plant community in compared with the competitiveness (C), stress-tolerance (S) and ruderality (C-S-R) signatures with the control. Facilitations were reflected by the stagger arrangements in relative growth rates of the two species and in plant-plant interactions calculated by a modified function of competition. Adapting to symmetric disturbance and developing facilitative interactions are important requirements for early succession terrestrial vegetation to establish and stabilize in the seriously saline environments of wetlands.

Overexpression of suadea salsa S-adenosylmethionine synthetase gene promotes salt tolerance in transgenic tobacco

80%

Qi Y.-C., Wang F.-F., Zhang H., Liu W.-Q.

Acta Physiologiae Plantarum

2010

tom 32

nr 2

The suadea salsa full-length S-adenosylmethionine synthetase (SsSAMS2) was introduced into tobacco (Nicotiana tabacum L.) by Agrobacterium tumefaciens-mediated transformation. The gene transformation and expression in tobacco were confirmed by PCR, RT-PCR and Northern blotting analysis. Several transgenic lines (ST lines) overexpressing SsSAMS2 gene under the control of cauliflower mosaic virus 35S promoter showed more seeds number and weight, and accumulated higher free total polyamines (PAs) than wild-type plants (WT lines) and transformants with blank vector (BT lines). Salt stress-induced damage was attenuated in these transgenic plants, in the symptom of maintaining higher photosynthetic rate and biomass. These results that the transgenic plants overexpressing suadea salsa SAMS2 are more tolerant to salt stress than wild-type plants suggest that PAs may play an important role in contributing salt tolerance to plants.

Ograniczanie wyników

2 Polish Journal of Ecology

1 Acta Physiologiae Plantarum

1 Cui L.

1 Guo W.

1 He P.

1 Kang X.

1 Li M.

1 Li W.

1 Li Y.

1 Liu W.-Q.

1 Liu X.

1 Pan X.

1 Ping Y.

1 Qi Y.-C.

1 Song T.

1 Wang F.-F.

1 Wang R.

1 Xu F.

1 Zhang H.

1 Zhou D.

1 2018

1 2016

1 2010

Wyniki wyszukiwania

Decomposition processes in coastal wetlands: the importance of Suaeda salsa community for soil cellulose decomposition

The response of wetland plant communities to disturbance: alleviation through symmetric disturbance and facilitation

Overexpression of suadea salsa S-adenosylmethionine synthetase gene promotes salt tolerance in transgenic tobacco