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以北京农田生态系统作为研究对象,对2004~2012年农田生态系统的碳汇及释氧功能的年际变化进行了研究,结果表明:北京市农田生态系统氧气释放量总体呈现逐年增加趋势,以2008年最高,年平均氧气释放量为270.9万吨,农田生态系统中粮食作物的年均氧气释放量所占比例最高为80.1%,在粮食作物中玉米的氧气释放量所占比例最高为69.3%,单位耕地面积的氧气释放量平均为12.89 t·hm-2·a-1,总体呈逐年增加趋势;北京农田生态系统碳蓄积量总体也呈增加趋势,年递增幅度为2.8%,年平均碳蓄积量为105.82万吨,其中粮食作物的碳蓄积比例增加较为显著,且粮食作物年均碳蓄积量所占比例最大为80.4%,在粮食作物中玉米的碳蓄积比例最大为68.5%,单位耕地面积年均碳蓄积量为5.03 t·hm-2,且呈逐年增加的趋势,年递增8.3%。北京市农田生态系统的固碳、释氧的气体调节作用的生态功能不容忽视。
Taking Beijing farmland ecosystem as the research object, the interannual variation of carbon sink and oxygen releasing function of farmland ecosystem from 2004 to 2012 was studied. The results showed that the oxygen release of farmland ecosystem in Beijing showed an increasing trend year by year In 2008, the annual average oxygen release was 2.709 million tons. The highest average annual oxygen release of grain crops in farmland ecosystems was 80.1%. The highest proportion of oxygen released from grain crops was 69.3% , And the average amount of oxygen release per unit of cultivated land was 12.89 t · hm-2 · a-1, showing an increasing trend year by year. The overall carbon storage in Beijing’s farmland ecosystems also showed an increasing trend with annual increase of 2.8% and annual average carbon The volume of carbon storage in food crops increased significantly, and the percentage of annual average carbon storage of food crops was 80.4%. The maximum percentage of corn carbon storage in food crops was 68.5% The average annual area of accumulated carbon was 5.03 t · hm-2, which showed a trend of increasing year by year with an annual increase of 8.3%. The ecological functions of gas regulation of carbon sequestration and release of oxygen in farmland ecosystems in Beijing can not be ignored.