基于ArcGIS的重庆市农田生态系统碳源/汇特征研究

Analysis on Characteristics of Carbon Source/Sink in Farmland Ecosystem in Chongqing Based on ArcGIS

以1997-2011年重庆市农作物产量、耕地面积及农业投入等相关统计数据为依据,对重庆市农田生态系统碳吸收量、碳排放量和碳汇强度进行了测算,以ArcGIS为技术手段进行碳源/汇空间特征分析.结果表明:1997-2011年重庆农田生态系统碳吸收总量总体处于稳定态势,粮食作物碳吸收比例下降,经济作物和果蔬作物碳吸收比例明显上升;碳排放总量呈逐步上升趋势,农用化学品投入是其主要排放源.从空间上看,2011年重庆市三大经济区域农田生态系统碳吸收、碳排放、碳汇的总量和强度从大到小依次为一小时经济圈、渝东北地区、渝东南地区.

Based on the statistical data of crop yields ,cropland areas and agricultural inputs from 1997 to 2011 in Chongqing ,the amounts of carbon absorption ,carbon emission and the intensity of carbon sink have been calculated ,and by means of ArcGIS ,the spatial-temporal variations has been analyzed .The conclusions are as following ：the total amounts of carbon absorption show a stabilized trend from 1997 to 2011 ;the carbon absorption ratios of food crops declined ,and the carbon absorption ratios of economic crops and fruits-vegetables crops show remarkable increasing ;the total amounts of carbon emissions show a gradual upward trend ,and the agrochemical inputs is the main source .From space ,the amounts and in-tensity of carbon absorption , carbon emissions , carbon sink in the three major economic regions of Chongqing in 2011 show ：One-hour Urban Economy Circle＆gt; Northeast of Chongqing Area＆gt; Southeast of Chongqing Area .Based on these conclusions ,suggestions and recommendations were provided .