【作者】 李光德； 秦风琴； 诸葛玉平； 李雪倩； 孟凡乔； 吴文良； 郭岩彬；

【Author】 LI Guang-de 1 , QIN Feng-qin 2 , ZHUGE Yu-ping 1 , LI Xue-qian 3 , MENG Fan-qiao 3 , WU Wen-liang 3 , GUO Yan-bin 3 (1.College of Resources and Environmental Sciences, Shandong Agricultural University, Taian, 271018,China; 2. College of Sciences, China Agricultural University, Beijing 100193,China; 3. College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193,China)

【机构】 山东农业大学资源与环境学院； 中国农业大学理学院； 中国农业大学资源与环境学院；

【摘要】 与常规农业不同,有机农业生产中禁止使用化学合成氮肥,因而有机和常规农业生产模式下作物产品中15N丰度即δ15N存在差异,可以据此区分有机和常规农产品。本研究选择北京郊区5个有机和1个常规蔬菜生产基地,对蔬菜及土壤取样,对其δ15N进行测定,分析有机和常规生产条件下蔬菜及土壤中δ15N的特征。研究结果表明,随着有机生产时间和有机肥N投入的增加,土壤全N和δ15N都呈现增加的趋势,且当季作物对于肥料的δ15N反映敏感。蔬菜δ15N与蔬菜全N、与土壤δ15N,土壤δ15N与土壤全N之间可以用直线回归方程拟合,且都达到极显著水平的相关程度。对于北京地区,95%概率条件下可以认为有机叶菜、根菜和果菜δ15N值应大于7.55‰、7.64‰和5.42%。δ15N值可以作为蔬菜是否使用化学N肥的"有效工具",但不能作为唯一手段,还应该结合生产履历、现场检查等其他措施,综合进行判定。更多还原

【Abstract】 Organic vegetable production prohibits the use of synthetic nitrogen (N) fertilizer and this leads to the differences on δ15N for vegetable and soil from organic farm, which can be utilized as the approach to identify organic vegetable from conventional products. We selected 5 organic and 1 conventional vegetable bases from Beijing suburb and sampled their soil and vegetables for the analysis of δ15N. Research indicated that as organic operation period and organic fertilizers amount increased, total N and δ15N of soil had the tendency of increase and, vegetable reflected sensitively for the fertilizer applied of its δ15N. The relationship between vegetable δ15N and total N, vegetable δ15N and soil δ15N, soil δ15N and soil total N can be modeled by linear regression with significant level of correlation (P<0.01). For Beijing suburb, δ15N of leave, root and fruit vegetables was higher than 7.55‰, 7.64‰ and 5.42% respectively at 95% probability level. δ15N value can be adopted as an effective tool but not as the sole tool for identifying if synthetic N was applied in vegetable production and farming record, on-site inspection and other measures should be also employed together.更多还原