[Relationship Between Diversity of Aquatic Plant Communities and Water Environmental Factors in Lhalu Wetland].

Plant diversity plays an important role in the integrity and stability of wetland ecosystems. Lhalu Wetland is the highest wetland in the world and is the largest urban natural swamp in China. It plays an important role in ecological balance, increasing air humidity, improving the urban climate, and purifying the water environment in Lhasa.

[Effect of Biochar on Root Morphological Characteristics of Wetland Plants and Purification Capacity of Constructed Wetland].

A constructed wetland with L. was built. Straw biochar, reed biochar, and sawdust biochar was added into the constructed wetland individually to study the effect of different biochars on the root morphology, dissolved oxygen, and purification ability of the constructed wetland.

[Effect of different substrates on photosynthetic characteristics of Iris pseudacorus L. and the capacity of purify wastewater].

The effect of the different substrates on the photosynthetic characteristics, transpiration rate and SPAD value, and capacity of purify wastewater was investigated by pot experiment, based on five ordinary substrates (soil, sand, mixture of soil and sand, mixture of sand and organic matter, and mixture sand, soil and organic matter). Results showed that the photosynthetic characteristics and transpiration rate of Iris pseudacorus L. were influenced by different substrates.

[Biological responses of maize seedlings to single and combined stress of cadmium and phenanthrene].

Maize (Zea mays L.) pot-culture experiments were conducted in this study for exploring the biological responses of maize seedlings to single and joint stress of Cadmium (Cd) and phenanthrene. The results showed that single-Cd treatment with Cd concentration ranging from 0 to 50 mg/kg had no significant influences on the above-ground biomass, root biomass, and the soluble protein of maize seedlings; with the increase of Cd concentrations, the maize leaf SOD activities appeared as an increasing-decreasing trend, while the POD, CAT, APX activities increased persistently.

Changes in enzymes activity, substrate utilization pattern and diversity of soil microbial communities under cadmium pollution.

Heavy metal pollution has received increasing attention in recent years mainly because of the public awareness of environmental issues. In this study we have evaluated the effect of cadmium (Cd) on enzymes activity, substrate utilization pattern and diversity of microbial communities in soil spiked with 0, 20, 40, 60, 80, and 100 mg/kg Cd, during 60 d of incubation at 25 degrees C. Enzyme activities determined at 0, 15, 30, 45, and 60 d after heavy metal application (DAA) showed marked declines for various Cd treatments, and up to 60 DAA, 100 mg/kg Cd resulted in 50.