中文摘要：

采用森林植被生物量换算因子连续法,估算了甘肃省森林植被碳贮量和碳密度,并对其地理分布及动态变化进行了讨论。主要结果如下：1）据甘肃省第五次森林资源普查数据,甘肃省森林植被总碳贮量为1.025×108t,较第一次森林资源清查时的0.8658×108t有一定提高,总量只占我国森林植被总碳贮量的1.5%左右;甘肃省森林植被平均碳密度为51.8047t/hm2。云、冷杉林碳密度最高,为67.7342t/hm2,是甘肃省森林植被平均碳密度的1.3倍。2）依甘肃省第二次森林资源清查结果计算,甘肃省14个地州市中,甘南藏族自治州森林植被碳贮量最大,为0.3297×108t,天水市和陇南市次之,分别为0.2010×108t和0.1823×108t。3）甘肃省五次森林资源清查总碳贮量分别是0.8658×108t、0.8991×108t、0.8120×108t、0.8665×108t和1.0252×108t,总体呈先上升后下降再上升的＂N＂字型趋势。

英文摘要：

The carbon storage and density of forest vegetation in Gansu Province were estimated base on the data from the 5th forest resource inventory（1999-2003） and the variable BEF（Biomass Expansion Factor） method.Also the spatial distribution of carbon storage and density of Gansu forest vegetation was studied from the forest inventory database.The results indicated that：1） The total carbon storage of forest vegetation in Gansu accounts for 1.025×108t at present,while it was only 0.8658×108t in 1977～1981.Carbon storage of forest vegetation in Gansu is only about 1.5% of the forest vegetation in China.2） The average carbon density of forest vegetation in Gansu is 51.8047 t/hm2.The Picea-Abies forests are the largest carbon density of 67.7342 t/hm2 among all the forest types.3） Base on the second forest inventory data（1984～1988） among 14 prefectures of Gansu province,Gannan possesses the largest carbon storage about 0.3297×108t.And Tianshui and Longnan follow it by 0.2010×108t and 0.1823×108t respectively.4）The total carbon storage of forest in 1977～1981,1984～1988,1989～1993,1994～1998 and 1999～2003 are 0.8658×108t,0.8991×108t,0.8120×108t,0.8665×108t and 1.0252×108t,respectively,with an increasing trend from 1977 to 1988,while in 1989～1993 has a sharply down.Since 1994 the carbon storage increases steadily.The overall trend like a ＇N＇ text.