Taking Guangdong province as an example, this paper used life cycle assessment, jatropha biodiesel production in marginal land suitability evaluation to have a estimate on jatropha biodiesel production and carbon reduction potential quantitatively on the basis of using the ratio of energy proportion and carbon emission reduction. The results showed that the total net energy potential of jatropha biodiesel in Guangdong was 2.56×1013MJ, which is equivalent to 5.48×108t traditional diesel, the potential of carbon emission reduction is 1.92×109t. The total production potential of northern Guangdong is the highest, accounting for 36.38% of the total. According to the statistics of the administrative unit, the 21 cities are quite different, Meizhou and Qingyuan occupy one and two places,accounting for 11.00%and 10.37% of the total, respectively. The total potential of sparse woodland,shrubbery land was large,among them, the total potential of sparse woodland is the largest, which is nearly twice the potential value of shrubbery, which is 1.25×109 t.According to the unit area of marginal land,the emission reduction potential of bare land,open forest land, high coverage grassland, bare rock and gravel land is higher, and not much difference between each other. Among them, the bare land has the largest potential of emission reduction,which is 2 740.90 t/hm2of per unit area.%文章以广东省为例,运用生命周期研究法,在麻疯树柴油生产边际土地适宜性评价的基础上,利用能量比率及碳减排比例,对麻疯树柴油的生产和碳减排潜力进行定量估算.研究结果表明:广东省利用边际土地种植麻疯树可生产生物柴油的总净能量潜力值为2.56×1013MJ,相当于5.48×108t传统柴油,同时碳减排潜力值可达1.92×109t;粤北地区的总净能量潜力值最高,占到全省的36.38%;按行政单元统计,21个市的净能量潜力值差别较大,梅州和清远分居第1,2位,分别占全省的11.00%,10.37%,中山市最少;各种边际土地类型中,疏林地、灌木林地的净能量潜力值和碳减排潜力较大,其中疏林地的碳减排潜力最大,是灌木林地碳减排潜力值的两倍,可达1.25×109t;按边际土地单位面积统计,裸土地、疏林地裸岩和石砾地的单位面积碳减排潜力较高,彼此相差不大,其中裸土地的单位面积碳减排潜力最大,为2740.90 t/hm2.
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