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Concentration of 4 heavy metals (Cu, Pb, Zn, Cd) and petroleum hydrocarbon in the surface sediments collected from Chenglingji, Dongting Lake, were quantitatively analyzed. Distribution characteristics and possible sources of the heavy metals and petroleum hydrocarbon were discussed. Methods of single-factor index and geoaccumulation index were adopted to evaluate the potential ecological risks of heavy metal. The results showed that Cd was seriously polluted and in a strong ecological risk level; Cu, Pb and Zn pollution was mild in Chenglingji Port, Dongting Lake. Petroleum hydrocarbon content of nearshore sediment was low exclude of area near Chenglingji Port, which significantly exceeded the standard value. And the content of petroleum hydrocarbon decreased with the distance far away from the harbor.

Galaxolide (1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethyl-cyclopenta-γ-2- benzopyran, HHCB) is recognized as a novel contaminant in water and has potential adverse impacts on aquatic organisms. The toxic effect of HHCB on Phanerochaete chrysosporium was investigated by exposure of the fungus in nitrogen-limited culture medium to various concentrations of HHCB. DNA damage of P. chrysosporium by HHCB was detected. Comparing with that in the control, the percent polymorphism under different concentrations of HHCB increased, from 21.4% to 42.9%. In addition, the result of UPGMA (un-weighted pair group method of arithmetic means) dendrogram showed that the Simple Matching Coefficient (SM) was decreased with an increase in the concentrations of HHCB. Thus, as an environmental pollutant, HHCB has the toxic effect on P. chrysosporium at molecular level.

In this paper, the toxic effect of the dye wastewater onPhanerochaete chrysosporiumwas investigated. The DNA damage of the dye onP. chrysosporiumwas analyzed using the AFLP method. Comparing with that in the control, the percent polymorphism under different concentrations of the dye increased, from 17.54% to 53.49%. In addition, the result of UPGMA (un-weighted pair group method of arithmetic means) dendrogram showed that the Simple Matching Coefficient (SM) was decreased with an increase in the concentrations of dyes. Results suggested that the dyes have toxic effect onP. chrysosporiumat molecular level as environmental pollutants.

In view of the modal parameter identification when only has the output signals of the system under ambient excitations has difficulty, a new method which can identify the structural modal parameters exactly based on singular value decomposition of the power spectrum is put forward. This method is used in the modal parameter identification of a cable stayed bridge under ambient excitations, and the identification frequency is compared with the finite element computation frequency. The results indicated that this method has overcome the subjectivity in modal selection of frequency domain pick-peaking method, choose eigenfrequency and identify close modal accurately and objectively. With the advantages of practical, processing simply and fast.

The effect of boat-generated waves on mangrove forests could be reflected by width change of tidal inlets by using satellite image in this study. Our results showed that the distributions of mangrove zone on the side of tidal inlets were degenerated by boat-generated waves from 2009 to 2011 in Dongzhai Harbor Mangrove Natural Reserve. The main reason of this change was strong erosion of tidal flat caused by the waves generated by high speed and frequencies boats for tourists. To protect the mangrove forests of the tidal inlets, the drive speed and pass frequencies of the boats in waterway should be restricted and decreased.

Rigidoporopsis tegularis Juan Li & Y.C. Dai and Skeletocutis fimbriata Juan Li & Y.C. Dai are described as new from Hubei Province, central China. Rigidoporopsis tegularis is characterized by thick-walled, finely ornamented, amyloid and subglobose basidiospores, and monomitic hyphal structure without clamp connections. Skeletocutis fimbriata is distinguished from the other species in the genus by coarsely fimbriate margin basidiocarp and very narrow basidiospores.

During waterway dredging engineering due to the disturbance of construction operation on water, the original substrate will change and suspended solids will concentrate sharply in a short period of time resulting in the change of local ecosystem and river habitat landscape and bring adverse impacts on aquatic organisms. This paper expounds the ecological characteristics of waters in the area of dredging engineering. Combining with the overall requirements of water ecological environment protection, the paper analyzes the impact of waterway engineering on the ecological environment and puts forward relevant countermeasures and suggestions.

Hyphodontia septocystidiata and Hyphodontia sinensis are reported as new to science. Hyphodontia septocystidiata has grandinioid to odontioid hymenophore, encrusted cystidia, septocystidia and capitate cystidia and broadly ellipsoid to subglobose thick-walled basidiospores. Hyphodontia sinensis has odontioid hymenophore, leptocystidia and capitate cystidioles and broadly ellipsoid, thin- to slightly thick-walled basidiospores. Descriptions and line drawings are provided for these two new species.