The Research Of Two Species Of Sawfly Damaged On The Coniferous Plantations Influence Carbon Sinks

In the global context of climate change intensifies,the forest carbon sink is also growing concern by the public,research on forest carbon sinks have become hot in recent years,scholars of various disciplines.Northeast as the main distribution area of forest to study the forest carbon sink function is particularly important,especially in the vast area of coniferous plantations.Northeast China conifer plantations vast area,but the stand structure is relatively simple,relatively low ecosystem stability,in addition to climatic conditions affected by the change,but also susceptible to pests and diseases interference,to some extent,affected the carbon sink function.Research on forest carbon sinks and abroad for a long time,mostly concentrated in the areas of forest carbon sink function studies,estimates of forest carbon stocks,forest carbon sink function in response to climate change,etc.But little research focuse on the carbon sink function effect by forest pests.This study is based on the background of global climate change,the purpose is to determine the changes of forest insects are harmful carbon stocks,to get the amount of carbon changing data,research pest infestation disturbance intensity on forest carbon sink function,provide a basis for forest pests and diseases data and scientific evidence,the role of forests as carbon sinks into full play,in order to maintain stability of the entire forest ecosystem.This paper focuses on the Northeast coniferous forest plantation built of larch trees,pinus defoliators by Cephalcia larciphila Wachtl.and Acantholyda posticalis Matsunura damage of Plantation carbon sink function of(without research on the solid understory vegetation carbon capacity and the impact on the carbon cycle),changes in carbon stocks in trees,and even change the entire forest system tree to estimate carbon sinks.Study on the growth of Pinue sylvestris plantation forestry in Huanan area and Larch plantation forestry in Hailin after damage by sawflies,two tree-ring width index chronologies of two regions were established to provide scientific basis for determining two kinds of sawflies damaging on plantation history of thees regions.On this basis,combined with the study of carbon rate of two species of trees,scientific and effective to estimate the effects of forest carbon sequestration function damaged in two regions.Provide a reference for the further realization of integrated pest management of forest plantations.The results showed,Acantholyda posticalis M.outbreak time was 3 time section,which is great eruption is 1979?1981,2001?2002 and 2010?2012 in Huanan.And Cephalcia larciphila W.eruption dating for 1985?1990 and 2010?2012 in IIailin.Huanan area Acantholyda posticalis M.maximum outbreak caused biomass loss of Pinus sylvestris plantation for 32.31?64.99 kg/hm2.Hailin area Cephalcia larciphila maximum outbreak caused biomass loss of Larch plantation for 17.4?63.8 kg/hm2.Carbon loss in Huanan by Acantholyda posticalis M.outbreaks caused by interference of Pinus sylvestris plantation and in Hailin by Cephalcia larciphila outbreaks damaging on Larix gmelinu plantation were respectively for 14.99?30.15 kg/hm2 and 6.75?24.69 kg/hm2.It provide reference for the further implementation of the two regions of artificial forest of integrated pest management.