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通过农田样方观测与实验分析获得主要农作物的含碳率、经济系数、果实水分系数,再根据盐亭县近55年来(1949~2004年)农作物产量与耕地面积的相关数据,估算了该区农田生态系统植被碳储量与碳密度的动态变化。结果表明,近55年来该区农田植被碳储量和植被碳密度都有一定程度的提高,具有碳汇效应;但植被碳储量和碳密度很不稳定。植被碳储量以大春作物为主(占总碳储量的70.80%);近期大春作物的比重略有下降,而小春作物所占比重则略有上升。今后该区应加强农田基本建设,维持农业生产和农田植被碳储量的稳定;改进农业生产技术和管理水平,提高作物单产、农田植被碳储量和碳密度;适度扩大水稻、马铃薯和油菜等作物的种植面积,稳定小麦播种面积。
The carbon content, economic coefficient and fruit moisture coefficient of main crops were obtained through farmland plots observation and experimental analysis. According to the data of crop yield and cultivated land area of Yanting County in recent 55 years (1949 ~ 2004) Dynamic Changes of Plant Carbon Storage and Carbon Density in Farmland Ecosystems. The results showed that in the past 55 years, the vegetation carbon storage and vegetation carbon density in this area have increased to a certain extent, with the carbon sink effect; however, the vegetation carbon storage and carbon density are very unstable. Plant-based carbon stocks are dominated by spring crops (accounting for 70.80% of total carbon stocks); the proportion of large-crop spring crops has declined slightly in recent years, while the proportion of small-spring crops has slightly increased. In the future, the basic construction of farmland should be strengthened so as to maintain the stability of agricultural production and the carbon storage of farmland vegetation; to improve agricultural production techniques and management, to increase crop yields, carbon stocks and carbon density of farmland vegetation; to moderately expand crops such as rice, potato and rapeseed Planting area, stabilize the sown area of wheat.