摘要
为区分植物在土壤-植物系统N2O排放中的贡献,用封闭式箱法对田间栽培的大豆植株及土壤、大豆植株-土壤系统的N2O排放进行了测定,同时对影响N2O的排放的因素进行了分析。观测结果表明:田间栽培的大豆的N2O排放通量昼间变化模式是10∶30有一个排放高峰,153∶0有一个排放低谷,甚至表现为可吸收大气中的N2O;在生育期内,大豆植株有两个释放高峰,分别位于6月下旬和8月中旬。从6月下旬至8月末,大豆对土壤-植物系统N2O排放的贡献率约为25%～57%。大豆植株、大豆植株-土壤系统N2O排放通量与温度有一定的相关性,相关系数r2分别为0.4954和0.5357,大豆N2O的排放通量同光合速率有一定的相关性(r2=0.5944)。
To fractionate the contribution of plant to N2O emission from soil-plant system, the N2O emissions from soybean, soil and soil-plant system were measured by closed chamber method under field condition. In the meantime, some factors （photosyn-thesis and air temperature） affecting N2O emission were also studied. The results showed that during the daytime： there were one of N2O emission peak in the morning （10：30） and one valley in the afternoon （15：30） even absorbed the atmospheric N2O, from soybean plant under field conditions. Two peaks of N20 emissions from soybean plant occurred at late June and the middle August stages, respectively. The emission of N2O from soybean accounted for 25%-57% of the total N2O emissions from soil-soy-bean system during the period of time from late June to the end of August. It was found that there was a certain correlationship between N2O emission of soybean plant, soybean-soil system and air temperature （r^2=0.4954 and 0.5357）.There was a certain correlationship between N2O emission of soybean plant and photosynthesis r^2=0.5944）
出处
《沈阳农业大学学报》
CAS
CSCD
北大核心
2007年第6期776-779,共4页
Journal of Shenyang Agricultural University
基金
国家自然科学基金重点项目(40331014
30270131)
