Accumulation of non-point source pollutants in ditch wetland and their uptake and purification by plants

Abstract

Abstract: The study on the vertical and horizontal distribution of organic matters and total nitrogen (TN) in the sediment of ditch wetland naturally grown with reed (Phragmites communis) and wild rice (Zizania latifolia) showed that the sediment below 40 cm depth had a significant effectiveness in retaining and accumulating organic matters and TN,but in its surface layer,this effectiveness varied largely with seasons,and the maximum was more than twofold of the minimum.TN was highly correlated with organic matters,the correlation coefficient being 0.9876 in reed wetland and 0.9335 in wild rice wetland,and in water phase,it was positively related to NH₄⁺-N and NO₃-N,indicating that the main composition of TN was organic N,and the mineralization of organic N was the sources of inorganic N.The harvest of reed in each autumn could take away 818 kg穐m^-2 of N and 103.6 kg穐m^-2 of P,and that of wild rice could take away 131 kg穐m^-2 of N and 28.9 kg穐m^-2 of P.Zizania caduciflora had a high assimilation ability of nutrients.Its cultivation in ditch wetland to replace wild helophytes would be a good approach to attain higher absorbing ability of N and P,and to resolve the secondary pollution problem of emerged plants,because farmers could harvest it voluntarily.

Key words: Ditch wetland, Emerged plants, Nitrogen and phosphorus, Non-point source pollutants

CLC Number:

X506

JIANG Cuiling, FAN Xiaoqiu, ZHANG Yibing . Accumulation of non-point source pollutants in ditch wetland and their uptake and purification by plants[J]. Chinese Journal of Applied Ecology, 2005, 16(7): 1351-1354.

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