摘要
利用^(15)N层标记的土柱试验法,研究了蔬菜和大田种植体系中菠菜、小麦两种作物及小麦的两个品种对土壤不同层次标记硝态氮利用的差异。结果表明,菠菜对土壤10～20、40～50、70～80cm层次标记硝态氮的利用率分别为40.7%、29.9%、23.4%,小麦两个品种小偃54和京411利用率分别为45.5%、16.1%、7.7%和32.5%、12.4%、4.7%。菠菜对土壤不同层次标记硝态氮的利用率显著大于小麦,小偃54对土壤不同层次标记硝态氮的利用率显著高于京411。作物的根长密度与相应土层标记硝态氮的利用率呈显著的正相关关系。作物收获后土壤剖面NO-3-N含量分布的总体趋势是菠菜小于小麦,小麦品种间为小偃54小于京411。土壤10～20cm层次的标记NO-3-N峰下移到40～50cm,40～50cm层次标记NO-3-N没有发生明显移动,而70～80cm层次标记NO-3-N可见较为明显的上移趋势,并在60cm左右出现累积峰。菠菜和小麦之间、小麦品种之间土壤不同层次标记NO-3-N的移动距离没有显著差异。
The difference on the utilization of labeled nitrate-N in different soil layers between two kind of crops, spinach and wheat, as well as two varieties of wheat was studied by means of soil column experiment. The results show that the recovery rate of labeled nitrate-N in spinach, Xiaoyan 54(wheat), Jing 411 (wheat) were 40.7%, 29.9%, 23.4% ; 45.5%, 16.1%, 7.7% and 32.5%, 12.4%, 4.7%, respectively, when nitrate-N was labeled in 10-20, 40-50, 70-80 cm soil layers. Between crops, the recovery of labeled nitrate-N in different soil layers by spinach was significantly higher than that of wheat. And between varieties, Xiaoyan 54 was significantly higher than that of Jing 411. Significant positive correlation was observed between crop root length density in corresponding soil layers and the recovery of labeled nitrate-N. In general, the distribution of nitrate-N in soil profile after harvest in column with spinach was lower than that with wheat, and Xiaoyan 54 was lower than Jing 411. After harvest, the peak of labeled nitrate-N in 10-20 cm layer was moved down to 40-50 cm, while that labeled in 40-50 cm layer did not move downward clearly and that labeled in 70-80 cm layer had the tendency to move upward and accumulated at 60 cm. No significant difference was observed on the moving distance of labeled nitrate-N in different layers between spinach and wheat and between two varieties of wheat.
出处
《中国农业科学》
CAS
CSCD
北大核心
2005年第2期333-340,共8页
Scientia Agricultura Sinica
基金
国家自然科学基金资助项目(30270787
30390081)
国家"十五"攻关重大专项资助项目(2002BA516A02)
