Effects Of Biochar,nitrogen And Phosphorus Addition On Growth And N₂O Emission Of Cinnamonum Campora（L.）Presl

The N₂O emissions from forest ecosystems are mainly estimates by soil emissions.If the emissions of tall trees are ignored,estimating N₂O emissions from forest ecosystems using soil emissions may underestimate N₂O emissions across the ecosystem.Cinnamonum campora（L.）Presl has a wide distribution in the red soil region of southern China.Because of its high economic value and ecological benefits in the development of forestry in southern China.Therefore,the research on Cinnamomum camphora has become a hot topic in related research fields in recent years,which has crucial theoretical and practical significance.Fertilization is an important management measures in forestry,but it may bring more greenhouse gas emissions.Biochar can effectively reduce greenhouse gas emissions from intensively managed forest soils.Biochar materials are generally derived from abandoned plants and animals.Dead pig waste is a very important animal biomass resource that is difficult to handle and has a large amount.Based on the above operational problems and the need to utilize waste biomass resources,this study carried out research on the effects of biochar,nitrogen and phosphorus addition on Cinnamomum camphora growth and N₂O emissions.Using static box-gas chromatography,Cinnamomum camphora seedlings were studied,and biochar and nitrogen and phosphorus fertilizers were added.The effects of postgraduate material carbon and nitrogen and phosphorus fertilizers on the N₂O emission flux of Cinnamomum camphora forest soil and forests were studied to investigate the effects of fertilization and biochar addition on Cinnamomum camphora N₂O emissions,and to develop corresponding forestry emission reduction measures and improve the economics of plantation forests.Provide a theoretical basis for ecological benefits and response to global climate change.The research results are as follows:（1）The application of nitrogen fertilizer could significantly promote the N₂O emission rate of forest soil.After applying biochar,the N₂O emission rate of forest soil could be significantly slowed down.The cumulative N₂O emission of forest soil increased with the increments of nitrogen fertilizer.When nitrogen fertilizer and biomass was added,it could significantly reduce the cumulative emissions of N₂O.（2）The application of nitrogen fertilizer could significantly promote the N₂O emission rate of Cinnamomum camphora seedlings.The application of biochar had no significant effect on the N₂O emission rate of Cinnamomum camphora seedlings.The cumulative N₂O emission of Cinnamomum camphora seedlings increases with the increase of nitrogen fertilizer,and nitrogen fertilizer and biochar are applied together.Afterwards,the cumulative emission of N₂O from Cinnamomum camphora seedlings was not significant,and there was a significant positive correlation between soil temperature,soil N₂O emission rate and N₂O emission rate of Cinnamomum camphora seedlings.（3）The addition of nitrogen fertilizer could significantly promote seedling growth and biomass increase.Biochar and nitrogen fertilizers were applied together and promoted better effects.Nitrogen levels and biochar levels reached significant levels,but there was no significant interaction between them.The application of nitrogen and phosphorus fertilizers was better than that of single application of nitrogen fertilizer.The level of phosphate fertilizer significantly promoted the seedlings of Cinnamomum camphora,and there was a significant interaction between nitrogen and phosphorus fertilizers.（4）Nitrogen fertilizer and biochar had little effect on soil p H.Phosphate fertilizer had no effect on soil p H.Nitrogen could promote the absorption of available phosphorus in soil,and adding biochar and phosphorus could increase the effective phosphorus content in soil.Nitrogen addition could increase the content of ammonium nitrogen and nitrate nitrogen in the soil.The addition of biochar and phosphorus could promote the absorption of ammonium and nitrate nitrogen by plants.In summary,the single application of nitrogen fertilizer significantly accelerated the N₂O emission rate of soil and Cinnamomum camphora seedlings.With the increase of nitrogen level,the cumulative N₂O emission of soil and Cinnamomum camphora seedlings increased significantly.After the application of biochar,the N₂O emission rate of soil could be significantly slowed down,but the addition of biochar had no significant effect on the N₂O emission rate of Cinnamomum camphora seedlings and the cumulative N₂O emission of Cinnamomum camphora seedlings.The application of nitrogen fertilizer,biochar and phosphate fertilizer could significantly promote plant growth and promote the absorption of soil nutrients by plants.Therefore,in forestry management,rational use of waste biomass resources to reduce greenhouse gas emissions during forestry management,we should avoid single application of nitrogen fertilizer,should promote appropriate nitrogen fertilizer,a certain amount of phosphate fertilizer and increase the use of biochar,can effectively avoid waste of waste resources,increase fertilizer utilization,increase the economic benefits of forestry operations,and reduce N₂O emissions during intensive operations.