Mopanshan Reservoir Agricultural Nonpoint Source Pollution Prevention And Control Optimization Of Riparian Buffer Zones

The pollution of the drinking water source has become one of the most important environmental issues which the global people are facing together. The prevention and control of agricultural non-point source pollution, as well as the protection of drinking water sources area, are also the currently hot spots of research at home and abroad. This study selected source of drinking water in Harbin-Mopan Mountain Reservoir as the background, began to experiment. Test is divided into two parts,one is the plant screening test, in the different concentration of nutrient solution and the same, Five economic hydrophytes (Melilotus suaveolens,Trifolium repens,Digitaria sanguinalis,Prunella asiatica and DracocephalummoldavicumL) were selected to carry out a research on the purification N and P ability and bio-ecological character of them were also studied, the root, stem and detached leaf length of each species have different degrees of growth. Other is small test research,four kinds of economic plants (Melilotus suaveolens,Trifolium repens,Digitaria sanguinalis and Prunella asiatica) were selected from the plant screening test. By using the artificial water of farmland runoff, in the different concentration of nutrient solution and the same the study carried out in different configuration ways of plantings and sod combined with other biological treatment. The results are as follows:1. Throughout the experimental period, leaf number, root length, stem length of the plant has a different change, of plants to adapt to different concentrations of nutrient. Plants on the removal rate of ammonia and soluble phosphate showed lower concentrations removal rate higher, but soluble phosphate in nutrient solution in the removal of three little difference.2. Period of five plants under different nitrogen and soluble phosphate showed different removal, the removal rate increases the initial training, the emergence of a peak and then decline, in the end of the trial, the rich have emerged bottom flask Nutrition phenomenon.3. Four different buffer zone configuration on flow of water removal capacity of ammonia showed more complex configuration, the buffer zone on the ammonia removal capacity of the higher concentration of single species in the concentration 2 maximum ammonia removal capacity of 52.19% mixed farm of two, three order, three concentrations of mixed farm in the concentration 3 maximum removal rate were 60.52%,66.53%,70.49%, the removal of soluble phosphate capacity is not performance a clear trend, a single species, mixed farm of two, three order, mixed farm of three maximum removal of soluble phosphate, respectively, in the 2nd, the 1st, the 3rd, the 2nd, respectively,35.34%,41.89%, 54.89%,57.39%, on the runoff of ammonia nitrogen removal performance for the more complex configuration, the lower ammonia removal, the removal of soluble phosphate trend was not significant.4. Removal ability of ammonia in runoff water different configuration ways of plantings and sod combined with other biological treatment, "three kinds of plants and artificial floating bed" and "three kinds of plants and a small ditch" was as high as 30.10% and 25.40% in concentration 1. Removal ability of soluble phosphate in runoff water different configuration ways of plantings and sod combined with other biological treatment, "three kinds of plants and artificial floating bed" and "three kinds of plants and a small ditch" was as high as 26.70% and 29.00%in concentration 2.5. In seepage flow, among all the configuration ways of plantings and sod combined with other biological treatment, the mixed planting of three plants had high removal capacity, with the removal rate of ammonia reached 59.80%, and that of soluble phosphate 53.6%; in the runoffs, the highest removal rate of ammonia and soluble phosphate reached 25.6% and 23.30% in different planting ways; considering different configuration ways of sod combined with other biological treatment, the dispositions of "three kinds of plants and a small ditch" had a high soluble phosphate removal rate of 29.0%, and the ammonia removal rate of "three kinds of plants and artificial floating bed" was as high as 30.1%.