中文摘要：

依据2003-2013年临沂市农作物产量、耕地面积、农作物播种面积及农业投入等数据,对临沂市农田生态系统碳源、碳汇进行估算,分析其变化规律并探讨临沂市农田生态系统碳源、碳汇的影响因素。结果表明,2003-2013年临沂市农田生态系统的碳排放量呈现先增后减的情况;5种主要碳排放过程中,化肥施用过程中碳排放所占的比例最大;各县区碳排放量,远郊大于近郊;碳吸收、碳汇呈现增加的趋势,并具备很强的碳汇功能;小麦、玉米作为主要的粮食作物,碳吸收量远高于其他的农作物;各县区由于自然条件和发展方向的不同,碳吸收量与单位播种面积碳汇量差异较为明显。碳源、碳汇影响因素分析表明,碳吸收与小麦、玉米、水稻、花生等高产量作物、农作物总产量及农作物总播种面积显著正相关;碳排放量与农膜等农用化学品投入、农业机械等燃料动力使用和农业灌溉等显著正相关;碳汇量与碳吸收量显著正相关。

英文摘要：

Based on the data of crop yields,cropland areas and agricultural inputs in the period from 2003 to 2013,the amounts of carbon source and carbon sink of the farmland ecosystems in Linyi were calculated,the changes law of carbon source and carbon sink were analyzed,and the influence factors of carbon source and carbon sink were discussed.The results showed that the carbon emission of farmland ecosystems in Linyi from 2003 to 2013exhibits the trend of firstly increased and then decreased.Among the five main carbon emissions in the process,carbon emissions of chemical fertilizer was higher than other processes. The carbon sequestration and carbon sink showed a rising trend and had a very strong carbon sink function.As the main food crop,the carbon sequestration of wheat and corn were far more than other crops.Due to different natural conditions and development directions in different counties,carbon sequestration were obviously different from the amount of carbon sink of unit sowing area.The analysis showed that the carbon sequestration of the farmland ecosystem in Linyi was positively correlated with the yields of staple crops,and the carbon sequestration was positively correlated with carbon sink.