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中文摘要：
通过田间小区试验研究CO2浓度（本底CO2浓度：360μmol/mol,倍增CO2浓度：720μmol/mol）对不同施氮水平（不施氮：0 kg/hm^2,低氮：150 kg/hm^2,常规施氮：300 kg/hm^2,高氮：450 kg/hm^2）棉花干物质积累、有机碳及全氮含量的影响。结果显示：CO2浓度倍增,除常规施氮处理外各施氮处理地下部干物质量均增加;地上部干物质量随施氮量不同变化趋势不同;总体上降低了地上部分配比例,增加了根冠比,提高了干物质含量百分比。降低了土壤有机碳积累量,20-40 cm土层降幅高于0-20 cm。随生育期延长,CO2浓度倍增和施氮水平对土壤有机碳积累产生负效应;棉花叶片、蕾、茎秆中有机碳含量均表现为正积累,根中有机碳为负积累;CO2浓度倍增和增加施氮量,总体均不同程度地增加了棉花不同器官中的全氮含量。
英文摘要：
The effect of carbon dioxide concentration（ background value： 360 μmol / mol; multiplication value： 720 μmol / mol） on accumulation of dry matter weight and content of organic carbon and total nitrogen in cotton plant with different nitrogen application level（ no nitrogen application： 0 kg / ha; low nitrogen： 150 kg / ha; conventional nitrogen application： 300 kg / ha; high nitrogen： 450 kg / ha） through the plots experiment in the field. The results showed that,with the multiplication of carbon dioxide concentration,dry matter content of belowground increased under different nitrogen application level except conventional nitrogen treatment; dry matter content of aboveground had a different change trend with different nitrogen application level; overall,the percentage of aboveground decreased,the ratio of root to shoot increased,and the dry matter content all increased; accumulation of soil organic carbon reduced,and degree of reduction in the 20—40 cm soil layer was higher than that in 0—20 cm. Nitrogen application level and carbon dioxide concentration multiplication made a negative effect on accumulation of soil organic carbon as cotton growth period extended. Organic carbon content in the cotton leaves,buds,stems were characterized by positive accumulation,which in the roots were negative. Total nitrogen content in different organs of cotton plant increased with the multiplication of carbon dioxide concentration and nitrogen application level.
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