Xingan Leaves Litter Dynamic Simulation Of Pine Nitrogen Deposition Response Analysis

Forest litter as forest ecological system of material circulation and the important liKNO3of the energy flow, forest ecological system to the structure and fuNH4CItion of plays a very important role. This study from September2010to September2011, with refereNH4CIe to the actual atmospheric nitrogen deposition flux (8.5Kg·hm-2·a-1), the greater hinggan mountains of INH4NO3er Mongolia is characterized simulated nitrogen deposition pine leaves in the treatment of the test to ammonium chloride (NH4CI) potassium nitrate (KNO3) and ammonium nitrate (NH4NO3) three kind of nitrogen fertilizer as nitrogen source, and set respectively established (NO,OKg·hm-2·a-1) low nitrogen (N1,10Kg·hm-2·a-1) of nitrogen (N2,20Kg·hm-2·a-1) high nitrogen (N3,40Kg·hm-2·a-1) four treatment using collector method and nylon pockets of law, investigation and study the sing-an larch years litter content litter month dynamic and litter decomposition rate, the results indicate:(1) By different forms different doses nitrogen treatment, every year to litter content become different litter content in the range of2679.33～4638.13Kg·hm-2between, reflect the uneven characteristics of distribution and yield of natural forest individual. by treating with different forms of nitrogen, obtain these results, as follows:by treating with different NH4CI processing (NO, Nl, and N2, N3), litter content were4258.62Kg·hm-2,3878.13Kg·hm-2,2679.33Kg·hm-2and3030.93Kg·hm-2, in comparison, the higher coNH4CIentration of nitrogen, the stronger inhibition is, but did not reach statistical significant differeNH4CIe. Different doses KNO3processing (N0, N1, N2and N3), litter content were4258.62Kg·hm-2,4280.13Kg·hm-2,4063.47Kg·hm-2and4638.13Kg·hm-2as contrast, the higher coNH4CIentration of nitrogen, the stronger promoting affect is, N1and N2reached significant differeNH4CIe (P<0.05); NH4NO3processing (N0, N1, and N2, N3), litter content were4258.62Kg·hm-2,3799.73Kg·hm-2,4175.6Kg·hm-2and4358.53Kg·hm-2, promote to litter content of the composite, the treatment have not reached significant level.(2) The different form and different doses of nitrogen treatment, month shows significant seasonal litter scale dynamic, seasonal change present the single-peak type, litter appear in September peak, the processing of peak litter (September), KNO3and NH4NO3processing N1and N3to significant differeNH4CIes between. (3) In response to different forms and dose n480d, and litter after120d decomposition of different n’s handling of the litter decomposition with the passage of time has been gradually reduce and retention rate of the trend in the120d litter leaves, residual rate curve steep, retention rate between59.43to70.01%, the NH4CI processing performa NH4CIe, the higher is the co NH4CI entration, the stronger is the inhibition; KNO3processing show the co NH4CI entration is the higher, the promoting effect is the stronger; NH4NO3processing show that low nitrogen treatment and nitrogen treatment has some promoting fuNH4CItion. high nitrogen treatment showed inhibitory effect at its braNH4CIhes retention rate between59.43～70.01%, NH4CI and KNO3processing are performing the inhibition; NH4NO3processing show that the higher coNH4CIentration of nitrogen, the higher the promoting fuNH4CItion is. NH4CI processing of low amount of nitrogen treatment and egual amount of nitrogen treatment show promoting fuNH4CItion, high nitrogen possess the inhibition;The higher is KNO3processing coNH4CIentration of nitrogen, the higher is the promoting effect; NH4NO3processing all represent certain stimulative effect.