Measurement And Study Of Carbon Storage For Urban Greening Tree Species In Southern China Based On Terrestrial Laser Scanning

The study of nondestructive measurement and related researches of carbon storage for urban green tree species have great significance to assess the carbon storage function of urban forests,due to it plays an important role in forest carbon stock.In order to study the measurement of carbon storage for urban greening tree species based on terrestrial laser scanning(TLS)and to evaluate the accuracy of volume and carbon storage measured by existing models,in this study 30 point clouds samples of Sapindus mukorossi and Ginkgo biloba L were captured by TLS.Then the branches and leaves and stem drill cores were also sampled respectively by pole tree pruners and coring device to obtain the volume and carbon storage of stem based on different section length,and to measure the volume and carbon storage of leaves based on different pixel size,and to measure the BEF based on different methods.Afterward the result were compared and analyzed and these data were also compared with data derived from existing models of volume and carbon storages.The result showed that:1)The tree measuring factors could be obtained with high precision by TLS,due to the captured point clouds were high reducibility and authenticity.2)Although there is no significant different between the measurement of stem volume based on different section length,the volume and carbon storage of stem could be measured stably and accurately when the section length less than 0.5 m.3)At low resolution,the accurate measurement of canopy carbon storage could be obtained when the length of pixel was between 1/50 and 1/100 of crown wide.4)Generally speaking,the existing models had different degrees of shortage for measuring the stem volume and canopy volume and each organ carbon storage of urban greening tree species because of there is obvious difference in the trees between city and field stand.5)There was unobvious rules in BEF due to it’s leaping change.So it means the difference of BEF between urban greening species and field stand was significant(P<0.05).The diameter can be used as the reference for BEF selection which was used to estimate the carbon storage of urban greening tree species under the small city scale.