摘要
应用15N示踪方法,研究了春大豆对不同来源氮素的吸收利用特点。结果表明：大豆氮素营养随生育进程呈现时期性变化,土壤氮和肥料氮所占比例逐渐降低,而根瘤固氮所占比例逐渐上升。在出苗至4片复叶期（VE-V4）,大豆完全依靠土壤和肥料氮,是无机氮营养期;在4片复叶期至初花期（V4-R1）,氮素营养仍然主要来自土壤氮,根瘤固氮作用快速上升,是根瘤固氮快速上升期;营养生长与生殖生长并行期（R1-R5）,氮素营养主要来自土壤氮和根瘤固氮,两者作用接近,肥料氮的作用已很小,是无机氮营养与根瘤固氮并行期;生殖生长期（R5-R8）,大豆氮素营养主要来自根瘤固氮和土壤氮,根瘤固氮的作用已超过土壤氮,是根瘤固氮营养期;供试大豆品种的根瘤固氮率为52.8%~67.2%、平均58.7%,土壤氮为31.5%~40.9%、平均39.8%,肥料氮为1.3%~1.8%、平均1.5%。
This research was conducted by 15N tracer method to characterize various sources of nitrogen＇s assimilation and utilization by spring soybean,and the results were shown that： there was a periodic variation of nitrogen nutrition during the growth and development process,the proportion that Soil-N and Fertilizer-N occupied decreased by degrees,on the contrary,Nodulation-N accounted more and more proportion.As a result,nitrogen nutrition of soybean during the whole growth period could be divided into four phases：（1）Inorganic nitrogen nutrition phase-from VE to V4,soil-N and fertilizer-N were unique nitrogen source;（2）Nodulation-N rapid rise phase-from V4 to R1,nitrogen from soil played a major role,and nodulation-N accumulated rapidly.（3）Soil-N and Nodulation-N nutrition phase-from R1 to R5,soil-N and nodulation-N were main nitrogen source,fertilizer-N played less role;（4）Nodulation-N nutrition phase-from R5 to R8,nodulation-N played more important role than soil-N in spite of accumulation of soil-N.The proportion of nodulation-N,soil-N and fertilizer-N accounted for 52.8% ~ 67.2%,31.5% ~ 40.9% and 1.3% ~ 1.8% respectively,and means were 58.7%,39.8% and 1.5% respectively.
出处
《土壤通报》
CAS
CSCD
北大核心
2010年第5期1138-1141,共4页
Chinese Journal of Soil Science
基金
黑龙江省教育厅骨干教师项目
教育厅科研项目(10531010)资助
关键词
大豆
根瘤固氮
土壤氮
肥料氮
Soybean
Nodulation-N
Soil-N
Fertilizer-N
