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Liu W.,Sun Yat Sen University | Zhang J.,Sun Yat Sen University | Tian G.,Management Office of qiAo Dangan Provincial Nature Reserve | Xu H.,Guangdong Neilingding Futian National Nature Reserve | Yan X.,Sun Yat Sen University
Acta Oceanologica Sinica | Year: 2013

Being a primary producer, Microphytobenthos (MPB) play an important role in the benthic ecosystem of mangrove swamps. The temporal and vertical distribution of MPB biomass, expressed as chlorophyll a (Chl a), was investigated in mangrove swamps on the Qi'ao island and the Futian Mangrove Nature Reserve, Guangdong Province, South China. Both locations are situated in the Zhujiang (Pearl River) Estuary. For each location, bi-monthly sampling was carried out at four sites during low tide period. Except one site on the Qi'ao Island, which was in Phragmites australis marsh, all sites were in mangrove swamps. The Chl a concentration in surface (0-1 cm) sediment ranged from 0.2 μg/cm3 to 8.3 μg/cm3 in the Qi'ao Island and from 2.1 μg/cm3 to 15.6 μg/cm3 in the Futian Mangrove Reserve. The peak Chl a concentration occurred in winter or early spring, while the lowest Chl a concentration, with a value of about one quarter of the peak, was observed in summer or early autumn. The vertical distribution of Chl a concentration exhibited an exponential decline with depth, which indicated a muddy sediment with high organic matter, and the slope of the curve was positively related to Chl a concentration in the surface sediment. The MPB biomass of the Qi'ao Island was significantly lower than that of the Futian Mangrove Reserve. Our results suggest that the overlaying water quality might influence the MPB biomass in surface sediments. © 2013 The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg.

Zeng Y.,Sun Yat Sen University | Tian G.-H.,Management Office of Qiao Dangan Provincial Nature Reserve | Chen L.-Y.,Sun Yat Sen University | Li J.,Sun Yat Sen University | And 4 more authors.
Chinese Journal of Ecology | Year: 2011

Spartina alterniflora is one of the most successful invasive weeds in global estuaries and coastal wetland areas, and also, has major impacts on the coastal wetland soil ecosystems in China. This paper summarized the recent researches about the influence of S. alterniflora invasion on the soil ecosystems in estuaries and coastal wetland areas, mainly from the aspects of soil structural constituents (soil microbes and soil animals) and matter (carbon, nitrogen, phosphorus, and heavy metals) cycles. The shortcomings of the ongoing researches were discussed, and the future research emphases, e. g., the influence of the invasion on soil microbes, the integration of the studies of aboveand below-ground resources competition between S. alterniflora and native plants and related ecological processes, as well as the simulation and prediction about the invasion dynamics of S. alterniflora under the background of global climate change, were suggested.

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