广东省农田生态系统碳足迹时空差异分析

以广东省为例，通过1992要2011 年化肥、农药、农膜使用量、灌溉面积、农业机械总动力、农作物产量等统计数据，估算了区域农田生态系统碳吸收、碳排放及碳足迹的时空特征。结果表明院近20 年来，广东省农作物碳吸收总量总体处于下降趋势，从1992 年的4 017.02 万t 减少到2011 年的2 925.42 万t，减幅达到27.17%，年均递减1.66%。而碳排放基本上呈现逐渐增加的趋势，排放总量从1992 年的224.05 万t 增加到2011 年的261.69 万t，增幅为16.80%。广东省农田生态系统碳足迹呈现波动增加的趋势，2011 年比1992 年增长了89.76%，年平均增长率为3.43%，碳足迹占同期生产性土地面积比例逐渐增大，2011 年达到8.95%。广东省农田生态系统表现为碳生态盈余，且生态盈余占同期生产性土地面积比例逐步减小。各地区之间的碳足迹区域差异也较大。

Temporal and spatial difference in carbon footprint ofregional farmland ecosystem in Guangdong province

Taking Guangdong province as an exampled, estimates the temporal and spatial features of carbonabsorption, emission and footprint of regional farmland ecosystem based on the statistics of fertilizer, pesticides, agriculturalfilm usage, irrigation area, agricultural machinery power and crop output during 1992 to 2011. The results indicated that inthe recent 20 years, the total amount of carbon absorption of crops showed a declining tendency, it is reduced by 27.17%from 40 170 200 ton in 1992 to 29 254 200 ton in 2011. The annual average reduction ratio was 1.66%. The total amountof carbon emission basically showed a gradual increasing tendency, it increased by 16.80% from 2 240 500 ton in 1992 to2 616 900 ton in 2011. Carbon footprint of Guangdong farmland ecosystem showed a waving increase, it increased by89.72% from 1992 to 2011. The annual average increase ratio was 3.43%. The ratio of carbon footprint and production landarea of the corresponding period was gradually increased, In 2011 the ratio was 8.95%. There was carbon ecologicalsurplus in Guangdong farmland ecosystem. The ratio of ecological surplus and production land area of the correspondingperiod was gradually decreased. Carbon footprint varied greatly among different parts of Guangdong.