Effects Of Simulated Nitrogen Deposition On Litter Decomposition Of Nutrient Release Of Dynamic In Larix Gmelinii Forest Study

In this study.the Commissioner of Larix gmelinii Daxinganling simulated nitrogen deposition control test platform.To simulate atmospheric nitrogen deposition, referring to the local nitrogen deposition fluxes (8.5kg·hm-2·a-1),in accordance with the multi-metering control scheme simulated nitrogen deposition,and set the control (CK,0kg·hm-2·a-1),low nitrogen (N1,10kg·hm-2·a-1), nitrogen (N2,20kg·hm-2·a-1), nitrogen (N3.40kg·hm-2·a-1) nitrogen treatment four levels,namely simulated atmospheric nitrogen deposition in the coming times. under scenario2and4times, change Larix critical ecosystem nitrogen cycling processes. Each treatment was repeated three times.Using chemical method for the determination of litter C, N, P, K, Ca, Mg element content.1.litter decomposition rates under simulated nitrogen deposition.Litter in the decomposition rate of nitrogen fertilizer and control treatments are leaf>branch>fruit in the interaction NE4+and NO3-input, basically litter decomposition rate was significantly lower than that of N1CK,N2,N3treatment to fast,so low nitrogen conditions on litter decomposition has a certain role, N2handle branches and leaves in the performance of certain promote decomposition,N3treatment significantly inhibited the decomposition rate of litter.2. Litter C elements.C element content of the original fruit> branch> leaf; Litter C element content changes first drop to the last drop to gently; Nl treatment promote the release of the elements of C, N2and N3treatment inhibits the release of C element; C elements for leaching enrichment-release pattern.3. The litter content of N elements.N elements of the original content is fruit> branch> leaf:Litter N elements first fall on the rise and then decline to rise in general is rising;N1,N2and N3treatment increased the litter N elements.along with the increase of N application rate increased;N elements for leaching enrichment-release pattern.4. Litter P element content.P element original content is leaf> branch> fruit; First drop litter P element content gradually increases;N1, N2and N3treatment increased the litter P element content, along with the increase of n application rate increased,P branches and fruit for leaching, enrichment mode, leaves for the release of the model. 5. Litter K element content.Original K element content is> fruit> leaf:Litter K element content is gradually falling process:Nl and N2treatment promoted the release of K element;N3treatment inhibits the release of K element;K is the direct release model.6. Litter Ca element content.The Ca element content of the original fruit> branch> leaf;Litter Ca element content first fall and then rise and fall;Nl promote the release of the Ca element, and N2and N3treatment is first after promoting inhibition; The Ca element for leaching enrichment-release pattern.7.Litter content of Mg element.Mg element content of the original fruit> branch> leaf:Litter content of Mg element first down and then flatten out values:Nl promote the release of the Ca element.and N2and N3treatment is first after promoting inhibition;Mg is directly release model...