Nitrogen input of snowfall in Deyeuxia angustisfolia wetland system in Sanjiang Plain and its ecological effects

In order to study the effect of nitrogen (N) input of snowfall on the Deyeuxia angustisfolia wetland ecosystem in Sanjiang Plain,the snowfall,snow-pack,snow melting-water and leakage solution of soil (0～10 cm) were monitored from November 2006 to April 2007.The results show that the seasonality of the N concentration in snowfall is evident,and influenced by the manifold factors.The deposition of TIN,TON and TN in snowfall are 0.375,0.591 and 0.966 kg/hm² in winter,respectively.The snow-pack reservoir determines the N reservoir.The NH₄⁺-N and TON are the main body of TIN and TN in the snow melting-water,respectively,but the NO₃^--N and TIN lose more easily than NH₄⁺-N,TON,respectively.The interceptions of TIN,TON and TN are 1.53,0.1 and 1.63 kg/hm² by soil (0～10 cm) respectively.The nitrogen input of snow melting-water has directie ecological signification which stimulates growth of the plant and the microbe in soil.