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Leung J.Y.S.,City University of Hong Kong | Tam N.F.Y.,City University of Hong Kong | Tam N.F.Y.,Futian Cityngrove Research and Development Center
Journal of Experimental Marine Biology and Ecology | Year: 2013

Sonneratia caseolaris, a superior mangrove species characterized by rapid growth and proliferation, has been introduced to Futian Mangrove National Nature Reserve, Shenzhen, China for mangrove restoration since 1993. However, the effect of Sonneratia plantation on the macrobenthic infaunal community, a vital component of energy flow and nutrient recycling in mangrove ecosystems, remains obscure. The present study aimed to answer this question by determining the macrobenthic infaunal community, habitat characteristics and physico-chemical properties of sediment in the vegetated sites, dominated by different mangrove species (Kandelia obovata, Avicennia marina and S. caseolaris), and un-vegetated mudflat at four sampling times from August 2008 to September 2009. Results showed that the presence of Sonneratia can enhance the biodiversity of macrobenthic infauna in terms of Shannon-Weaver index (H'), compared to the mudflat, since August 2008 onwards. Multivariate analyses (CLUSTER and SIMPER) showed that the macrobenthic infaunal community in the Sonneratia site was different from all the other sites due to higher abundance of deposit and filter feeders, including Limnodriloides sp., Capitella capitata, Potamilla acuminata, Tharyx sp. and Ampharete arctica. The presence of Sonneratia, however, could not significantly alter the sediment properties. Spearman correlation analysis revealed that H' was negatively correlated with cadmium concentration whereas distance-based linear model (DistLM) suggested that cadmium was a significant predictor variable correlating with the macrobenthic infaunal community. The higher cadmium concentration in August 2008 explained why H' was lower and different macrobenthic infaunal communities were observed compared to the other sampling times. However, cadmium was the only significant predictor variable explaining 14.9% total variation, suggesting that the macrobenthic infaunal community was generally not affected by the sediment properties. Therefore, we concluded that Sonneratia plantation in the open mudflat can enhance the biodiversity of macrobenthic infauna in view of higher habitat complexity (e.g. presence of pneumatophores, below-ground vegetation and litter) on condition that the cadmium concentration was below the harmful level. © 2013 Elsevier B.V.. Source

Chen X.-X.,Shenzhen University | Chen X.-X.,Futian Cityngrove Research and Development Center | Li Y.,Center for Wildlife Animal Rescue and Protection | Ru Z.-Z.,Center for Wildlife Animal Rescue and Protection | And 6 more authors.
Chinese Journal of Ecology | Year: 2015

The structural characteristics, species diversity and succession of Heritiera littoralis community in Baguang, Shenzhen were comprehensively investigated by the transect method. The protection status of the ancient trees within this community was also evaluated. Based on the habitat characteristics, this community could be classified into three habitat groups and the diversity and succession tendency of each group were analyzed. Results showed that a total of 89 woody species, belonging to 35 families and 73 genera, were recorded. Among them, H. littoralis had the highest importance values in the arbor, sapling and seedling layers, followed by Cinnamomum burmanni, Psychotria rubra and Cerbera manghas, which also had high importance values. Saplings with a height less than 2.5 m occupied 83.26% of total individuals, among which, 78.37% was H. littoralis, indicating that the succession pattern of H. littoralis followed the pyramid-like tendency. The community in the habitat group adjacent to sea (seaward habitat) had the highest diversity index, followed by the habitat group furthest away from sea (landward terrestrial habitat), and the coastal marsh wetland habitat group had the lowest value. This finding indicated that as the community developed, the diversity in the first and the last habitat groups would increase, while that in the coastal marsh wetland habitat group would gradually decline. Due to anthropogenic and natural disturbances, H. littoralis in Baguang has already exhibited some endangered signs and more protection is urgently needed. © 2015, editorial Board of Chinese Journal of Ecology. All rights reserved. Source

LI F.-L.,Sun Yat Sen University | LI F.-L.,Futian Cityngrove Research and Development Center | LI M.-G.,Sun Yat Sen University | ZAN Q.-J.,Shenzhen Wild Animal Rescue Center | And 5 more authors.
Journal of Integrative Agriculture | Year: 2012

Cuscuta campestris, a dodder, can parasitize and suppress a scrambling herbaceous to semi-woody perennial vine, Mikania micrantha, one of the most destructive weeds in the world. To assess the effects of the mixed residue of C. campestris and M. micrantha on the subsequent plant community, we conducted a one-year experiment on the germination and seedling growth of subsequent plant community after the application of C. campestris. Seven treatments of varying proportions of C. campestris and M. micrantha residue on 21 subject trees and shrubs, which were commonly found in South China, resulted in a germination rate of 35.3% for all 8 715 seeds from 18 species, ranging from 5.7 to 81.9%; the remaining 3 species failed to germinate. ANOVA analysis showed that the residue did not affect the germination, growth, or mortality of the trees and shrubs. The germinated C. campestris seeds from the residue coiled the seedlings of most of the species, but less than 4% host death caused by C. campestris. In addition, the residue did not affect the germination of the herbaceous seedlings originating from the loam, and the similarity coefficients of the germinated seedlings between the treatments were very high. These results suggested that the residue had no negative impact on the germination and early seedling stages of the tree, shrub and grass species of the subsequent plant community. The use of C. campestris residue had a positive effect on the growth of M. micrantha, but it did not change the trend of M. micrantha being suppressed because re-parasitization occurred soon after the growth restarted. No negative effect was detected on the other species as a result of the parasitization of C. campestris or by the use of the mixed residue. This suggests that C. campestris is likely to be an effective and promising ecologically safe native herbaceous agent for controlling M. micrantha. © 2012 Chinese Academy of Agricultural Sciences. Source

Li F.,Futian Cityngrove Research and Development Center | Yang Q.,Futian Cityngrove Research and Development Center | Zan Q.,Futian Cityngrove Research and Development Center | Tam N.F.Y.,Futian Cityngrove Research and Development Center | And 7 more authors.
Marine Pollution Bulletin | Year: 2011

Construction cost (CC) is a quantifiable measure of energy demand for biomass production, and low CC is hypothesized to give an alien plant growth advantages and increase its potential to be an invader. Comparison of leaf CC and growth traits between alien and native mangroves in Shenzhen Futian Nature Reserve showed CC per unit mass (CC mass), carbon concentration and gross and ash-free caloric values of alien mangroves were significantly lower than those of native species, while the height and chest circumference were just the opposite. Alien species Sonneratia apetala had the lowest CC mass while Sonneratia caseolaris had the lowest CC area, and were 8.99% and 32.17% lower than those of native species, respectively. Conversely, specific leaf area (SLA) of these two Sonneratia species was significantly higher than native species. Lower CC and higher SLA make the two Sonneratia species grow and spread faster than other mangroves and enhance their invasive potential. © 2011 Elsevier Ltd. Source

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