| On the basis of the indoor artificial wetlands treating duck wastewater, this paper was to study the effects of duck manure on the natural wetlands in a year, tracking and monitoring the nitrogen, phosphorus and organic carbon in wetland soils, and in the growing and the growth period of reed, determined the nitrogen and phosphorus of the plants. In the final calculating the nitrogen, phosphorus and organic matter stocks in the soil and the nitrogen and phosphorus accumulation of wetland plants; in the village there are a lot of reed waste piling up at random, thus, investigating the reed waste on situ, the results as follows:(1)The total nitrogen content were decreased gradually with increasing soil depth, but the total nitrogen content in the 20-40 cm soil layer was close to the 40-60 cm. In the 0-20 cm layer, TN content increased firstly and then decreased and increased again, in July, TN content in soil significantly increased, and the third, forth and fifth districts existed significant differences (P<0.05) compared with the control, first and second districts. The TN content in the 20-40 cm and 40-60 cm soil layers showed a clear downward trend from April to August, after August there was a slight rebound. The influence of duck wastes on TN content in the 20-40cm and 40-60cm soil layers was small. According to the growth pattern, in the highest treatment, the soil nitrogen reserves of 1.89×104 t was obtained.(2)The organic carbon content were decreased gradually with increasing soil depth. For the 0-20 cm soil, in July, there existed a accumulation peak, except the second district, other treatments was significantly higher than controls (P<0.05), and the fifth district was the most significant, after July appearing a decreasing trend. The trend was consistent with TN. In the 20-40 cm and 40-60 cm layer, the organic matter content appeared a downward trend, and no significant differences among treatments.At the highest treatment the organic matter stock was1.56×105 t.(3)TP content was decreased with soil depth. For the different seasons, the seasonal variations of total phosphorus in each soil layer were in accordance with each other, and it was that the TP content in the soil decreased, the TP concentration decreased to a minimum in August, and the seasonal difference in the 0-40 cm soil layer was more obvious than 40-60 cm, but the duck waste slow down the decrease of phosphorus in 0-20 cm. Under the maximum processing, there was no produce toxic effect for the plants, and at this concentration, the phosphorus reserves was 7.60×103 t.(4)At different treatments, the reed biomass and height didn’t have large differences. In 1 hm2 reed wetland, the nitrogen and phosphorus accumulation were 53.88 ~ 67.35 kg and 22.20 ~ 27.75 kg respectively.(5)The survey was that reed waste accounted for about 38.44%, and thus in 1 hm2 reed wetland, the heat of the waste was about 3.98×107 ~ 4.96×107 kJ, equivalent to 1360 ~ 1695 kg standard coal, and converted into civilian coal for 1905~2374 kg, 1 hm2 reed can save up 760~948 yuan. Thus, taking the reed waste as biomass energy has a long development prospects. |
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