广东省农田生态系统碳源汇时空差异

以1992要2011 年广东省21 个地区农作物产量、农作物播种面积、种植面积、农业投入等相关数据为依据，对全省农田生态系统碳源汇进行了估算分析，并研究了农田生态系统碳源汇的影响因素。结果表明院20 年来广东省农田生态系统碳吸收总量总体呈现逐步下降趋势，其中粮食作物和经济作物的碳吸收量波动下降，果蔬作物碳吸收量显著增加；农田生态系统碳排放量呈现逐渐增加的趋势，其中化肥、农药等农用化学品投入带来的碳排放所占比例最大。广东省农田生态系统碳排放量远远小于碳吸收量，农田作物具有较强的碳吸收功能，表现为明显的碳汇。从分布格局来讲，不同区域之间的碳排放量和碳吸收量差异很大。

Temporospatial variation analysis on carbon source/sinkof farmland ecosystem in Guangdong

On the base of the statistical data of crop output, crop sewn area, planting area and agricultural input in 21zones of Guangdong during 1992 to 2011, this paper estimated carbon source and sink of Guangdong farmland ecosystemand studied the influente factors of carbon source and sink of farmland ecosystem. The results indicated that the totalamount of carbon absorption in Guangdong farmland ecosystem presented a gradual decline during the two decades. Theamount of carbon absorption of vegetables and fruits increased obviously. The total amount of carbon emission graduallyincreased, among which the amount of carbon emission caused by such agricultural chemicals as fertilizer, pesticide tookthe highest percentage. The amount of carbon emission was far less than that of carbon absorption in Guangdong farmlandecosystem. Crops had strong carbon absorbing function, represented obvious carbon sink. From the aspect of distributionpattern, the amount of carbon emission and carbon absorption diversed among various parts of Guangdong.