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Liu X.,Nankai University | Tang T.,Nankai University | Huang S.,Nankai University | Luo Y.,Haihe Water Resources Protection Bureau
5th International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2011 | Year: 2011

This paper developed a non-destructive method for measuring growth of constructed wetland plants, and it can be outlined as follow: doing image acquisitions of constructed wetland plants regularly with the help of digital camera; introducing image files to a computer through the developed interface, displaying them on the screen. Under Visual C++ compiling integrated environment, users can use the developed "constructed wetland plant image and growth information extraction software" to acquire plant contours (realized by image edge recognition) and plant sizes (characterized by top projected leaf area). The biomass and manually-measured individual plant heights in the experimental wetlands had good correlations, which indicate that the developed non-destructive method based on computer image processing can provide reliable of plant growing. © 2011 IEEE. Source


Liu X.,Nankai University | Tang T.,Nankai University | Huang S.,Nankai University | Luo Y.,Haihe Water Resources Protection Bureau
5th International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2011 | Year: 2011

Outdoor experiments were conducted to investigate two hydrophytes' (Typha orientalis Presl and Pontederia cordata) accumulating ability of nitrogen and phosphorus in eutrophic water. After 5 months' growth, biomass of Typha orientalis Presl and Pontederia cordata was 6.65kg·m-2 and 10.83kg·m-2 respectively, about 6 to 7 times of their biomass before cultivation respectively. TN contents in different parts of Pontederia cordata had the following order: leaves> roots>stems, while the order of TN accumulation in different parts of Typha orientalis Presl was roots> leaves>stems. Pontederia cordata had the highest nitrogen and phosphorus accumulation of 117.12 g·m-2 and 25.42 g·m-2 respectively. The below ground parts of Typha orientalis Presl accumulated much more nitrogen and phosphorus than those of above ground parts, and the ratio of nitrogen accumulated in the below ground parts of Typha orientalis Presl to the above ground parts was 2.98 and for phosphorus it was 3.79. © 2011 IEEE. Source


Zang C.,Nankai University | Huang S.,Nankai University | Wu M.,Nankai University | Du S.,Nankai University | And 4 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2011

Field enclosure experiments were carried out in Panjiakou Reservoir from August, 2009 to October, 2009, to study the impacts of fish stocking with bait on phytoplankton and water quality. The results showed that in Panjiakou Reservoir the phytoplankton density was maintained at 2.6 × 106 cells · L-1 in the experimental period, and the ratio of nitrogen to phosphorus was 112, so the reservoir was categorized as a "phosphorus-limited" reservoir. The phytoplankton densities in enclosures with bait only and with both fish stocking and bait were significantly higher than those in the controlled enclosure and the reservoir water, and the phytoplankton density in the bait only enclosure was significantly higher than that in the fish enclosures, with that in the bighead carp (Aristichthy novilis) monocultured enclosure being the lowest. Bighead carp and carp (Cyprinus carpio) could effectively restrain the growth of Cyanophyta, and change the dominant species of phytoplankton from Cyanophyta to Chlorophyta in the fish enclosures. Fish stocking with bait significantly increased the turbidity, CODMn and total phosphorus. The concentrations of total nitrogen and dissolved oxygen in enclosures with bait only and with both fish stocking and bait were significantly lower than those in the controlled enclosure and the reservoir water. In bait only and fish stocking with bait enclosures, significant positive correlations between phytoplankton density and the turbidity, CODMn, total phosphorus were found. Source


Du S.-L.,Nankai University | Huang S.-L.,Nankai University | Pan H.-C.,Nankai University | Zang C.-J.,Nankai University | And 5 more authors.
Environmental Engineering and Management Journal | Year: 2014

Algal blooms in reservoirs used for both fish and drinking water production are a major water quality problem. The authors assessed data gathered from both published literature and from their own field enclosure experiments to analyze the relationships of phytoplankton chlorophyll α concentrations with biomass and algal cell count. Experimental data were collected from indoor locations, field enclosures, and natural water bodies. Under laboratory conditions, where the types of algae and the nutrients provided were well controlled, a significant positive correlation between chlorophyll α and biomass was found out in all cases except when the dominant species changed considerably. Field enclosure experiments, with higher biodiversity but allowing control over nutrients, also showed significant correlations between chlorophyll α concentration and biomass. However, complex natural water bodies showed either positive or no correlation depending on the particular conditions. Under all three sets of conditions, the cell count of algae showed significant correlations with chlorophyll α concentrations if a single species was cultured alone or if it became the overwhelmingly dominant species in the field studies. If the dominant species changed during the course of the experiment, sometimes a positive correlation was observed but often there was no strong correlation between chlorophyll α and biomass. The research indicates that phytoplankton chlorophyll α may be used as an indicator for monitoring algal blooms in reservoirs. However, this study underlines the limits of its use. Source


Zang C.,Nankai University | Huang S.,Nankai University | Wu M.,Nankai University | Du S.,Nankai University | And 7 more authors.
Water, Air, and Soil Pollution | Year: 2011

The relationships between pH, dissolved oxygen (DO) and chlorophyll a in aquaculture and non-aquaculture waters are assessed in this paper. The research includes the evaluation of field and experimental studies at the Panjiakou Reservoir (between Aug and Oct 2009) and the review of international data covering two decades. The results indicated that typical eutrophic non-aquaculture water had mean concentrations of chlorophyll a of higher than 10 μg L-1, and significant positive correlations were found between pH, DO and chlorophyll a. When the mean concentration of chlorophyll a was less than 10 μg L-1, no correlation was found between DO and chlorophyll a for waters with a high exchange rate or heavily organically polluted natural waters. Diurnal variations were found for both pH and DO. A corresponding significant positive correlation was found between both water quality parameters. In general, when the mean concentration of chlorophyll a was less than 10 μg L-1 within aquaculture waters of low exchange rate, only a weak or no correlation at all was found between pH, DO and chlorophyll a during summer and autumn. On the other hand, a significant positive correlation between pH and chlorophyll a and a significant positive correlation or no correlation between DO and chlorophyll a were found for aquaculture waters with a high exchange rate during summer and autumn. Strong diurnal variations for both pH and DO were identified. A significant positive linear correlation between pH and DO was found for field enclosure experiments. © 2010 Springer Science+Business Media B.V. Source

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