Research On The Management Regulation And Control Of Carbon Accumulation Characteristic And Carbon Sink Function In Moso Bamboo Forest

Phyllostachys heterocycla forest,an important forest resource in south China,played an irreplaceable and important role in forest carbon sequestration and in adaptation of the forestry to climate change because of high growth rate,continuous cutting and sustainable utilization.The way of moso bamboo forest emission reduction and carbon sink increase included afforestation and management.It had appreciable impact on carbon sequestration capacity under different planting and management measures.Unreasonable management can leaded to the bamboo forest ecosystem becoming a net carbon emission source.This study focused on the subject of moso bamboo,adopted the method of fixed sample plot in order for long-term continuous monitoring,investigated carbon accumulation process of afforestation from 2008 to 201 8 and the changes in vegetation carbon storage,soil carbon pool,carbon emission,carbon leakage and biodiversity of understory vegetation under different management measures from 2010 to 2016.Focused on improving ecosystem carbon sequestration potential,we explored a management model which can combine several benefits,mastered carbon accumulation dynamic change process from afforestation to canopy closure under different planting ways and effects of different management measures on net carbon dynamic change and biodiversity response of understory vegetation systematically.With 3k orthogonal method,a factorial analysis with 3 levels of fertilization(high(900),medium(450)and low(0 kg ha-1 yr-1))and 3 levels of harvesting intensity(high(100%),medium(50%)and low(0%)cutting of the bamboo of 4-5 years old)has been taken.The results showed that:(1).The average diameter at breast high(DBH),average height and aboveground carbon storage accumulation rate of Moso bamboo forest had a slow-fast-slow variation trend.New bamboo carbon storage was determined by average DBH,average height and average number of culms.3-seedling per group planting was more conducive to increasing new bamboo number of culms and aboveground carbon storage accumulation than individual plant planting.The realationship between average DBH and afforestation age was refleced exactly in linear model,as well as average height and aboveground carbon storage accumulation.(2).Fertilization,harvesting,and the fertilization x harvesting interaction had significant effects on SOC concentration changes,but not on C storage after six years of management.Only the interaction between high fertilization and high intensity harvesting,which we called the intensive management measure,caused a decrease of 4.48 Mg C ha-1 in the 0-50 cm soil layer C storage.In addition,our study indicated that the 0-50 cm soil carbon stock was 112.15 Mg C ha-1 under the optimized management measure.(3).Fertilization,harvesting,period and interaction of fertilization×harvesting and harvesting×period had siginificant effects on moso bamboo carbon storage.It had a obvious increase from 2010 to 2012,treatment F3H3 increased most at 34.06 Mg C ha-1 and treatment F2H1 had least at]2.26 Mg C ha-1.The different management of 2012 to 2014 had varying degrees of decrease,treatment F1H3 decreased most at 21.52 Mg C ha-1 and treatment F2H1 decreased least at 2.51 Mg C ha-1.After 6 years managements,moso bamboo carbon storage change values of treatment F2H2 increased most at 18.23 Mg C ha-1 and treatment F3H3 had least at 3.91 Mg C ha-1.(4).Whether 2010 or 2013,the correlation of average DBH,number of culms and carbon storage between new bamboo and 3 or 5 years old bamboo was higher than it between new bamboo and 2 or 4 years old bamboo.Different management had great influences on average DBH,number of culms and carbon storage of new bamboo.Medium intensity harvesting had the most beneficial to inproving the quality of new bamboo.(5).The net carbon changes of high fertilization and medium intensity harvesting(69.137 Mg C ha-1)had a significant difference with high fertilization and high intensity harvesting(-0.476 Mg C ha-1)after six years of management.The soil carbon pool changes accounted for 70.50(±12.30)%of all carbon pool changes,the moso bamboo carbon storage for 26.17(± 1 1.24)%,the under canopy vegetation carbon storage for 0.52(±0.37)%,the transportation leakage for 0.33(±0.16%),and fertilization emissions for 2.47(±4.85)%.(6).There was a great influence on richness index of shrub by different harvesting intensities,as well as diversity index.Medium intensity harvesting was higher than low,which was better to increase richness,develop of dominant species and distribute equably.Be different from shrub,different fertilization rates had siginificant effects on richness and diversity index of herb,bamboo forest under medium fertilization had more richness and diversity of herb than non-fertilization.