福建长汀河田盆地的马尾松林碳储量时空动态变化

Analysis of Spatial and Temporal Dynamics of Carbon Storage of Pinus Massoniana Forest in the Hetian Basin in County Changting of Fujian Province,China

以福建省长汀县侵蚀退化严重的河田盆地为例,重点研究该区水土流失生态修复的主要树种——马尾松林的碳储量动态变化.通过2011年的野外样地调查获得了马尾松林的实测数据,并将其与同期SPOT5影像对应样地改进的归一化植被指数(MNDVI)数据进行回归分析,建立了河田盆地2011年马尾松林碳储量的反演模型.进一步通过不变特征法对所获得的2011年模型进行校正,使其能够推广应用于2004年和2009年的马尾松林碳储量反演,以揭示河田盆地马尾松林碳储量在2004—2011年间的时空变化.研究结果表明,这期间河田盆地马尾松林的总碳储量和碳密度均呈逐步上升的趋势:总碳储量由2004年的9.28×105 t增加到2011年的12.49×105 t,碳密度由27.31×10-4 t/m2增加到35.84×10-4 t/m2,总的说明该区马尾松林的碳汇能力在这期间有了明显的增加,而且在2009—2011年间表现得更为明显.

Implementing the ecological restoration by giving priority to planting trees in the eroded area,it is expected to increase the carbon sink of forests.This paper studies the dynamics of Pinus massonianaforest carbon storage of Hetian basin in Changting County of Fujian Province,southeastern China.As Pinus massonianais the main species used in the ecological restoration,we carried out field surveys with 31sampling sites in November 2011to acquire basic data of Pinus massonianaforest in the study area.The regression analysis between the filed-acquired data and the modified normalized difference vegetation index（MNDVI）data derived from a near-synchronised SPOT5image was performed in order to develop a model to estimate the carbon storage of Pinus massonianaforest in the Hetian basin area.The obtained 2011model was then calibrated using pseudoinvariant feature（PIF）method to allow the model to be used for estimating the carbon storage of Pinus massoniana forest in 2004and 2009.As a result,the spatial and temporal dynamics of carbon storage of Pinus massonianaforest in the Hetian basin during 2004and 2011were revealed.The results indicate a gradual increase in the carbon storage and carbon density of Pinus massonianaforest in the Hetian basin area in the study period.The carbon storage grew from 9.28×105 t in 2004 to 12.49× 105 t in 2011,accompanied by an increase in carbon density from 27.31×10-4 t/m2 to 35.84×10-4 t/m2 during the period.This suggests a significant increase of the carbon sink of Pinus massonianaforest in the area,particularly in the last two years from 2009 to 2011.