基于RS和GIS的无锡市陆地生态系统的碳源汇估算

The Estimate of Carbon Source and Sink of Terrestrial Ecosystems in Wuxi based on RS and GIS

基于IPCC—LULUCF建议的温室气体计量方法、遥感数据和文献资料,利用RS和GIS分析了1991～2005年无锡市土地利用变化所引起的陆地生态系统碳储量的变化,结果表明,近14a来,无锡市土地利用变化较明显,尤其是各种土地利用类型的相互转化,使得陆地生态系统碳库储量减少457.18×104 t,是碳源。具体表现在:地上碳储量减少145.91×104 t,地下碳储量减少59.87×104 t,土壤碳储量减少251.40×104 t。无锡市各种生态系统类型中,有林地的固碳潜力最大,为190.71t/hm2,其次是草地,为121.186t/hm2,农地最小,为92.6t/hm2,有林地面积的减少,造成有林地中固定的碳大量释放,使无锡市陆地生态系统成为一个明显碳源。

With its macroeconomic and real-time,Remote Sencing（RS） can be used to study the spatial pattern and time trend of carbon stock of terrestrial ecosystems.RS technology plays an important role in estimating the carbon sink function of terrestrial ecosystems.For carbon storage in terrestrial ecosystems in China,many scholars have made great results.However,most studies just concerned about a certain type of ecological system,and research on rapid economic develoment regions is even less.According to the methods in measuring greenhouse proposed by IPCC-LULUCF,using of data from Remote Sensing and literature,this paper analyses the carbon sink function of terrestrial ecosystems of Wuxi City from 1991 to 2005.As a result,the land use of Wuxi City has a great changes form 1991 to 2005,especially the conversion between different land use types is obvious.Because of the land use change,the carbon storage reduces 145.18×104 t totally,so the terrestrial ecosystems is a carbon sink.Particularly：the carbon storage of ground,underground and soil decreased by 145.91×104 t,59.87×104 t and 251.40×104 t.As far as the carbon sequestration potential,the forest is largest for 190.71 t/hm2,followed by 121.186 t/hm2 for grassland,the smallest is 92.6 t/hm2 for agricultural land.The reduction of forest area results a number of carbon released.