The Estimation Of Gross Primary Production Of Phyllostachys Pubescens Based On MODIS And Eddy Covariance Flux Data In Zhejiang Anji

Terrestrial ecosystem carbon cycle is one of the key content of the global changeresearch, while the study of terrestrial ecosystem productivity is an important part of theterrestrial ecosystem carbon cycle. As an important part of the forest ecosystem,Phyllostachy pubescens’ carbon sink function has been widely recognized. Compared tothe other terrestrial ecosystems, Phyllostachys pubescens’ carbon cycle research had beencarried less and the observational approaches also relatively backward. The application ofthe eddy covariance technique provides a long-term continuous observation data for thestudy of the Phyllostachys pubescens ecosystem productivity, but the tower flux footprintrange is very limited and the spatial scales extension is also very difficult. Remote sensingcan provide continuous、large-scale and quantitative data which make the Phyllostachyspubescens ecosystem carbon flux simulation and scale up scaling come true. The VPMmodel had already made a good simulation result of the productivity of terrestrialecosystems such as forests, farmland, highland meadow, but not been used inPhyllostachys pubescens ecosystem. This paper attempts to apply VPM model to estimatesPhyllostachys pubescens ecosystem’ gross primary productivity （GPP）, and use flux towerdata to verify and assessment the feasibility of remote sensing model to estimate thePhyllostachys pubescens gross primary productivity. The main conclusions are as follows:（1） The Phyllostachys pubescens in An’ji Shanchuan performance as a carbon sink atthe full year of2011. Phyllostachys pubescens ecosystem carbon cycle component （NetCarbon Exchange, Ecosystem Respiration and Gross Primary Productivity） showed asignificant seasonal variation. The total amount of Net carbon exchange is-417.523gCm^-2a^-1, the Ecosystem Respiration is1482.16gCm^-2a^-1, and the gross primaryproductivity is1899.69gCm^-2a^-1.（2） In this paper, MOD09A1was used to calculation the NDVI、EVI and LSWI, andthen used HANTS to denoise the EVI and NDVI and get the time series data of NDVI, EVI. For the LSWI is fluctuating, not handled the LSWI data. We integrated the flux towerphotosynthetic active radiation, temperature data into8d time interval data which isconsistent with the interval of vegetation index.（3） The VPM was used to simulate the seasonal and inter-annual dynamics change ofGPP in Phyllostachys pubescens ecosystem. The results showed that the GPP which wassimulationed by VPM model consistent well with the GPP got from the flux site in theseasonal trend and the total amount is very close, the R2is0.747, which means use VPM toestimate the Phyllostachys pubescens ecosystem’ productivity is potentially. But comparedwith the results of VPM model used in other ecosystems, there is still a certain gap,indicated that the VPM model needs further improvement when used in Phyllostachyspubescens ecosystem.