皖江城市带农作物碳储量动态变化研究

根据近20 a（1991~2010）主要农作物产量与耕地面积的相关数据，结合主要农作物的含碳率、经济系数、根冠比、果实水分系数，利用农作物产量与碳储量转换模型计算法对皖江城市带主要农作物碳储量、碳密度进行了估算，分析该区农田生态系统植被碳库的总量和构成的动态变化。结果表明：近20 a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，且2010年研究区农田植被碳储量占当年安徽省能源消耗总排碳量的2306%，具有十分明显的碳汇效应，但农作物碳储量和碳密度呈现一定的波动性。研究区中农作物碳储量以水稻作物为主(占总碳储量的6659%)，各市农作物碳储量、碳密度表现为：六安、滁州农作物碳储量最大，铜陵最小；滁州、马鞍山农作物碳密度最大，铜陵最小。最后根据该区农作物碳库的构成特点和动态特征，为其进一步提高农作物碳库的碳储量和碳密度提出一些建议

RESEARCH ON DYNAMIC CHANGE OF VEGETATION CARBON STORAGE OF CROPS IN THE WAN JIANG CITY BELT

According to the data of staple crops yield and cultivated land area during the last 20 years,the carbon storage and carbon density of the main crops in the Wan Jiang Urban Belt were estimated,and the variation of the compositions and the amount of carbon storage of the farmland ecological system were analyzed with the computational method in crop yields and carbon storage transformation model,on the base of the carbon rates of the main crops,economic coefficient,root shoot ratio and grains water content.The result showed that both the carbon storage and the carbon density of the crops in the farmland ecosystem of the Wan Jiang Urban Belt increased slightly during the last 20 years,accounting for 236% of the whole amount of carbon emission from energy consumption in Anhui province in 2010.This reflected the carbon absorbing effect obviously,whereas there was a variation of the carbon storage and the carbon density of the crops.The rice was the main crop for the carbon storage,accounting for 6659% of the whole carbon storage.The maximum amount of the carbon storage of the crops was in LuAn and Chuzhou,while the minimum was in Tongling.Correspondingly,the maximum amount of the carbon density of the crops was in Chuzhou and Ma’anShan,and the minimum was in Tongling.Finally,some suggestions about the improvement of the carbon storage and the carbon density were propounded according to the variation of the compositions and the amount of carbon storage of the farmland ecological system