Biomass And Carbon Storage And Hydrological Effects Of Six Kinds Of Artificial Forest In Guangzhou City

In this paper,a sample survey method was used to conduct sampling surveys on in Zengcheng of Guangzhou in 2017.The biomass,carbon storage,water-holding characteristics of litter and the water-holding capacity of the soil were respectively measured to evaluate the carbon sequestration capacity and hydrological effects of six kinds of artificial forests.And compare the various indicators with the 2008 survey data to provide basic data and theoretical basis for the construction of carbon sink forest and water conservation forest in Guangzhou.The main conclusions are as follows:(1)The analysis of the community structure of six kinds of artificial forests showed that with the exception of Rhodoleia championii forest,the species richness of Michelia macclurei forest was the highest in the shrub layer;Erythrophleum fordii forest is the lowest,the species richness of Michelia macclurei forest was the highest in the shrub layer,but Mytilaria laosensis forest is the lowest.The index of species diversity of Liquidambar formosana forest,Mytilaria laosensis forest and Camellia semiserrata forest was higher in the shrub layer than that herbaceous layer,and the other artificial forests were the opposite.The species diversity of Camellia semiserrata forest was the highest in the shrub layer,Michelia macclurei forest was the lowest.The species diversity of Rhodoleia championii forest was the highest,and Mytilaria laosensis forest was the lowest.(2)From the analysis of biomass and carbon storage in different vegetation layers of artificial forests,the results showed that the biomass and carbon reserves of the six artificial forests were:arbor layer>shrub layer>herb layer.The total biomass and carbon storage of Mytilaria laosensis forest was significantly higher than other artificial forests.The Camellia semiserrata forest was the lowest,and the order of the total biomass and carbon storage of the six artificial forests was:Mytilaria laosensis forest>Rhodoleia championii forest>Michelia macclurei forest>Erythrophleum fordii forest>Liquidambar formosana forest > Camellia semiserrata forest.the biomass and carbon storage of arbor layer also have the same laws.(3)There was a significant difference between the litter in the six kinds of artificial forest,the order of litter amount was:Michelia macclurei forest(10.56 t/hm~2)>Erythrophleum fordii forest(9.44 t/hm~2)Mytilaria laosensis forest(6.91 t/hm~2)>Camellia semiserrata forest(4.99 t/hm~2)>Rhodoleia championii forest(4.62 t/hm~2)>Liquidambar formosana forest(2.61 t/hm~2);There is also a significant difference between the maximum water-holding capacity of different litters,and the order of the maximum water-holding capacity of litter is:Michelia macclurei forest(12.91 t/hm~2)>Erythrophleum fordii forest(9.23 t/hm~2)>Mytilaria laosensis forest(7.86 t/hm~2)>Camellia semiserrata forest(5.40t/hm~2)>Rhodoleia championii forest(4.88 t/hm~2)>Liquidambar formosana forest(2.99t/hm~2).(4)The soil physical properties of six plantations were compared and analyzed.The results showed that natural moisture content,capillary porosity,and non-capillary porosity of the six kinds of artificial forest decreased with the increase of soil depth,while the soil bulk density showed a increasing trend;the average natural moisture content of different artificial forest soil layers existed the significant difference,the order of the average natural moisture content was:Erythrophleum fordii forest(34.80%)>Michelia macclurei forest(32.00%)>Mytilaria laosensis forest(29.89%)>Liquidambar formosana forest(28.20%)>Rhodoleia championii forest(24.56%)>Camellia semiserrata forest(22.96%);the order of average maximum water-holding capacity of soil layers in different artificial forest was:Mytilaria laosensis forest(1190.73 t/hm~2)>Erythrophleum fordii forest(1169.58 t/hm~2)>Camellia semiserrata forest(1164.96 t/hm~2)>Michelia macclurei forest(1147.17 t/hm~2)>Rhodoleia championii forest(1014.18 t/hm~2)>Liquidambar formosana forest(992.08 t/hm~2).This article compares the biomass,carbon storage,litter water-holding capacity and soil water-holding capacity of the six kinds of artificial forests in the experimental area in2008 and 2017.The average annual growth rate of arbor layer biomass and carbon reserves of six kinds of artificial forests was higher in the last 9 years than the previous 8 years.Compared with the previous 8 years.In 2017,the water-holding capacity of Michelia macclurei forest was higher than that of 2008,and the water-holding capacity of the other five artificial forest was lower than that of 2008;the saturated water-holding capacity of the soil of the Michelia macclurei forest and Mytilaria laosensis forest was higher in 2017 than in 2008.year,and the other 4 kinds of artificial forests were reduced.