• 研究报告 •

### 大气CO2浓度和供氮水平对油菜前期生长及氮素吸收利用的影响

1. 1湖南农业大学资源环境学院，土壤肥料资源高效利用国家工程实验室，农田污染控制与农业资源利用湖南省重点实验室，植物营养湖南省普通高等学校重点实验室，长沙 410128；2 海南省农业科学院，海口 571100；3国家油料改良中心湖南分中心，长沙 410128）
• 出版日期:2014-01-10 发布日期:2014-01-10

### Effects of atmospheric CO2 concentrations and N application levels on the growth, N uptake and utilization of oilseed rape during vegetative stage.

WANG Xiao-juan1,2, WANG Wen-ming1, ZHANG Zhen-hua1, ZHANG Li1, YANG Chun1, SONG Hai-xing1**, GUAN Chun-yun3

1. (1 College of Resources and Environmental Sciences, Hunan Agricultural University, Hunan Provincial Key Laboratory of Farmland Pollution Control and Agricultural Resources Use, Hunan Provincial Key Laboratory of Plant Nutrition in Common University, Changsha 410128, China; 2 Hainan Province Academy of Agricultural Science, Haikou 571100, China; 3National Center of Oilseed Crops Improvement, Hunan Branch, Changsha 410128, China)
• Online:2014-01-10 Published:2014-01-10

Abstract: Dry biomass and changes of nitrogen (N) uptake and utilization in oilseed rape during vegetative growth stage at two levels of CO2 (natural: 400 μmol·mol-1, elevated: 700 μmol·mol-1) and two levels of N application (normal: 15 mmol·L-1, limited: 5 mmol·L-1) were studied in a sand culture experiment. Results showed that plant height, basal diameter and dry biomass were increased under the elevated CO2 concentration, and the increment of either basal diameter or dry biomass at the normal N level was higher than that at the limited N level, but the increased degree of plant height and root dry weight showed an opposite pattern. Regardless of the N application levels, root volume, total active absorption area were increased under the elevated CO2 concentration, but number of the first lateral root was only increased at the normal N level, root length was only increased at the limited N level. N content in organs of oilseed rape was declined under the elevated CO2 concentration, and the declined degree of N contents in leaves and roots was significantly higher than that of stems. Under the elevated CO2 concentration, accumulation amount of N in roots, stems and leaves were increased at the normal N level, only increased in stems at the limited N level, and decreased in roots and leaves. N uptake efficiency, N use efficiency (NUE) and N efficiency were increased under the elevated CO2 concentration, and increased degree at the normal N level was higher than at the limited N level, and the response of NUE to N application levels was more obvious.