Measurement And Statistics Of Land-surface Forest Vegetation Carbon Sink In China

The world's three major carbon sequestration ecosystems are composed of oceans,soils and forests,of which land and sea sequestration is the most reliable.Terrestrial ecosystems fix atmospheric CO2 to vegetation and soil through photosynthesis.As an important carbon sink,the carbon sequestration of terrestrial ecosystems,especially forests,has been widely concerned.The research emphasis is to construct the carbon storage/carbon sink measurement system of land-surface forest vegetation in China by using 7,801 sample plot data in the sixth,seventh and eighth forest resources inventory and biomass data of different forest types across the country.The temporal&spatial change of surface forest carbon storage in China from 2000 to 2050 was analyzed,and the carbon sequestration potential and emission reduction contribution of land-surface forest vegetation in China from 2020 to 2050 were evaluated.This study lays a theoretical foundation for proposing the optimal forest management planning method,provides an effective means for comprehensively understanding the situation of forest carbon sink in China,and makes the forest vegetation carbon sink measurement method more simple and clear.To improve the estimation accuracy of arbor forest carbon storage is of great significance to study the absorption and emission of atmospheric CO2 by forest ecosystem.The DBH growth model of land-surface arbor trees in China was established.Based on latitude,longitude,altitude,annual average temperature,annual average rainfall,soil thickness,slope,slope direction and slope position,the DBH growth of 44 dominant arbor trees in China was accurately predicted,and RMSE%is 7.68%-14.59%.The forest stock volume-biomass conversion model of land-surface arbor forest was established.The biomass of 41 dominant arbor trees in China was accurately measured,and RMSE%is 7.66%?37.64%.To fill the research vacancy of economic forest carbon storage/carbon sink,shrubbery forest carbon storage/carbon sink,bamboo forest carbon storage/carbon sink and nursery carbon storage/carbon sink.The study provided basis for the accurate evaluation of the role of economic forest,shrubbery forest,bamboo forest and nursery in ecological environment construction,the calculation of green GDP and the establishment of ecological compensation mechanism.The ground diameter growth model of land-surface economic forest in China was established.Based on longitude,latitude,altitude,annual average temperature,annual average rainfall,soil thickness,slope,slope direction,slope position,the growth situation of ground diameter of four economic forest types were accurately predicted,including fruit trees,edible raw material trees,medicinal material trees and chemical industrial raw material trees,and RMSE%is 7.68%?14.59%.The biomass conversion model of land-surface economic forest in China was established.The biomass of four economic forest types was accurately measured,including fruit trees,edible raw material trees,medicinal material trees and chemical industrial raw material trees,and RMSE%is 0.67%?38.00%.The diameter growth model of land-surface shrubbery forest in China was established.According to longitude,latitude,altitude,annual average temperature,annual average rainfall and soil thickness,the diameter growth of shrubbery was accurately predicted,and RMSE%is 13.299%.The biomass conversion model of shrubbery forest was established.The biomass of shrubbery forest was measured accurately,and RMSE%is 27.36%.The biomass conversion model of land-surface bamboo forest in China was established,and the RMSE%of bamboo forest biomass measurement is 15.95%.The growth model of sapling in China was established,and the DBH and tree height growth of sapling was accurately predicted according to age.The sapling DBH growth predicted RMSE%is 8.41%?18.22%,and tree height growth predicted RMSE%is 6.81%?18.06.The biomass conversion model of sapling trees in China was established.The RMSE%of nursery biomass measurement is 1 1.76%?24.91%.The measurement of the forest vegetation carbon storage/carbon sink in China is the effective way to predict the existing and future of the arbor forest carbon storage,the economic forest carbon storage,the shrubbery forest carbon storage,the bamboo forest carbon storage and the nursery carbon storage.The study shows that the carbon storage,carbon density and carbon sink of land-surface forest in China show a rapid growth trend from 2000 to 2050;Mature forests in China play a leading role in the growth of carbon storage,and the quality of young forests,half-mature forests and mature forests has been steadily improved;Forest carbon storage in China are mainly concentrated in the southwest and northeast regions,with the largest carbon density in the southwest region and the fastest growth in the carbon storage and carbon density in the southwest region;Forest vegetation carbon storage and carbon density in Tibet are in a leading position.Forest vegetation carbon storage in Tibet grows the fastest,and forest vegetation carbon density in Xinjiang grows the fastest,while forest vegetation carbon storage and carbon density in Ningxia grow the slowest.The carbon sequestration potential of land-surface forest vegetation in China from 2020 to 2050 was analyzed.According to the study,forest vegetation in China will absorb 22.14 percent of CO2 emissions from fossil fuel combustion and play a leading role in slowing the growth of greenhouse gases over the next 30 years.