[Photo-induced Phosphate Release from Organic Phosphorus Decomposition Driven by Fe(Ⅲ)-oxalate Complex in Lake Water].

The phosphate released from organic phosphorus photo-decomposition has a significantly influence on the phosphorus levels in the water column in lakes. In order to reveal the effect of organic phosphorus photo-decomposition on phosphate level in lake water, the phosphate released from organic phosphorus photo-decomposition driven by Fe(Ⅲ)-oxalate complex under UV-Vis and sunlight irradiation was investigated in natural lake water using glyphosate as the model organic phosphorus. The effects of pH and initial concentration of Fe(Ⅲ), oxalate and glyphosate on the phosphate released from glyphosate photolysis were studied.

[Pollution Characteristics of Surface Runoff of Typical Town in Chongqing City].

Six kinds of impermeable underlying surface, cement tile roof, asbestos roof, cement flat roof, residential concrete pavement, asphalt pavement of restaurants, asphalt pavement of oil depot, and a combined sewer overflow canal in the Jiansheng town of Dadukou district in Chongqing city were chosen as sample plots to study the characteristics of nutritional pollutants and heavy metals in town runoff. The research showed that the average mass concentrations of TSS, COD, TN, TP in road runoff were (1681.2 +/- 677.

[Response of phosphorus components in sediments from eutrophic lake to external sulfate].

A six week experiment under indoor simulated condition was carried out to investigate the external sulfate transformation between the sediments and overlying water from Lake Nanhu in Wuhan, China, and the influence of sulfate on the phosphorus components was also studied. The results showed that the sulfate input increased the pH and lowered the Eh in the overlying water. The sulfate concentration in the overlying water decreased with time, and it was assumed that there existed an obvious transformation of sulfate to other forms of sulfur compounds according to the variation of sulfate concentration in the pore water.

[Effect of Fe-Mn-Si on the biomass structure of Eichhornia crassipes].

Eichhornia crassipes (water hyacinth) was cultivated under different iron (Fe), manganese (Mn) and silicon (Si) nutrient treatments for its biomass characteristics research which was determined by various items including nutrient element content (Fe, Mn and Si), adsorption sites and active function groups. The results show that Mn and Si can enhance acidic sites of the plant, in which Mn plays a great role, but Fe reduces the acidic sites. The sequence of acidic sites' amount among three parts of the plant is root > stem > leaf, in the treatment of Fe, Mn and their combination, and leaf > stem > root in Si treatment.

[Coupling effects of temperature, moisture, and nitrogen application on greenhouse soil pH and EC].

A laboratory incubation experiment was conducted to study the effects of temperature (T), moisture (W), nitrogen application (N), and their combinations on the pH and EC of greenhouse soil having cultivated for 5 years. The results showed that with the increase of incubation time, soil pH was decreasing, which could be well described by the first-order kinetic model, and the pH decreasing rate (k) under effects of test factors was in the order of N > W > W x N > T x W. Soil EC increased quickly to the maxima in the first week of incubation, decreased slightly then, and finally reached to a constant (EC(sty)).