乌江流域贵州段2000-2010年土地利用变化对碳储量的影响

Effects of Land Use Change on Carbon Storage in Wujiang River of Guizhou Province from 2000-2010

【目的】探究流域尺度土地利用变化对碳储量影响。【方法】利用InVEST模型,根据2000和2010年贵州省乌江流域土地利用数据,分析了2000-2010年乌江流域碳储量时空变化特征。【结果】结果表明：1水田和旱地大幅减少,常绿阔叶林、落叶阔叶林、草地、建设用地大幅增加,水田转化为建设用地以及旱地转化为常绿阔叶林、落叶阔叶林、草地和建设用地突出;2整个流域碳储量由2000年的1 302.72×10~6t增加到2010年的1 356.31×10~6 t,增加了4.11%。10年间,常绿阔叶林、落叶阔叶林、灌木林和旱地的碳储量所占比例一直较大。常绿阔叶林、落叶阔叶林、灌木林和草地碳储量增加,针阔混交林、水田、旱地和未利用地的碳储量降低。流域碳储量空间结构呈北部、东南部较高,中南部、东北部较低的特点。南部和中部碳储量降低,其他地区碳储量增加。【结论】退耕还林工程及快速城镇化是影响该流域碳储量变化的主要因素。

【Objective】The aim of the study was to explore the effects of land use change on carbon storage at watershed scale.【Method】Based on the land use data of 2000 and 2010,the spatiotemporal variations of carbon storage in Wujiang river basin from 2000 to 2010using the InVEST model.【Results】The results showed that：1 Paddy field and dry land were reduced sharply while evergreen broad-leaved forest,deciduous broad-leaved forest,grassland and construction land were increased dramatically.The conversions from paddy field to construction land or conversions from dry land to evergreen broad-leaved forest,deciduous broad-leaved forest,grassland and construction land were obvious.2 Carbon storage in the whole basin was increased by4.11%（from 1 302.72×106 t in 2000 to 1 356.31×106 t in 2010）.Evergreen broad-leaved forest,deciduous broad-leaved forest,shrubbery and dry land played important roles in carbon storage in the whole basin.Carbon storage for evergreen broad-leaved forest,deciduous broad-leaved forest,shrubbery and grassland was increased but carbon storage of theropencedrymion,paddy field,dry land and unused land was declined.Carbon storage was high in north and southeast parts.However,carbon storage was low in northeast and south central parts.Carbon storage declined insouth and central parts but increased in other parts.【Conclusion】The Grain-for-green project and rapid urbanization are the main factors affecting the variations of carbon storage in Wujiang river basin.