塔里木河干流土地利用/覆被变化对土壤有机碳储量的影响

Effects of land use/cover change on soil organic carbon storage in the main stream of Tarim River

结合遥感影像数据与野外实测数据,对塔里木河干流2000~2010年土地利用/覆被变化及其土壤有机碳含量分布、储量等进行了分析.结果表明:2000~2010年,塔里木河干流区土地利用/覆被面积和结构均发生了变化.其中,耕地、居工用地和灌丛地呈增加趋势,且耕地与灌丛地增幅最为明显,林地、草地、水体和裸地呈减少态势且林地减少幅度最大.在林地、草地、灌丛地和裸地中,除了灌丛地之外,与2000年相比2010年林地、草地和裸地土壤中储存的有机碳量减少,且2010年储存在四种类型土地中的有机碳总量少于2000年的.10年来土地利用/覆被类型的转换导致塔里木河干流地区0~100cm土壤有机碳储量发生改变,其中土壤有机碳储量下降了的转换类型有林–灌、林–草、林–裸、草–灌、草–裸和灌–裸,相反的转换则使土壤有机碳储量增加.

Combining remote sensing images with field survey data, land use/cover changes and soil organic contentdistribution were analyzed in the main stream of the Tarim River from 2000 to 2010. The results showed that the area andstructure of land use/cover changed during the time period. Specifically, arable, urban and shrub lands increased, withsignificant increase in arable land and shrub land. Woodland, grassland, water area and bare land decreased. Except forshrub land, the amount of soil organic storage in woodland, grassland and bare land reduced in 2010 compared with thatin 2000. Overall, the total organic carbon storage in woodland, grassland, shrub and bare land 2010 was less than that in2000.