氨是大气污染物，也是大田作物和一些森林植物的重要氮素来源，研究大气氨浓度升高对冬小麦生长和氮代谢的影响机理，对于丰富作物氮素营养理论及提高农田氮素利用效率具有重要意义。本项目拟以C₃植物冬小麦为供试作物，采用开顶式气室(Open Top Chambers, OTCs)装置和动态气室(Dynamic Chamber)装置，通过盆栽、水培、和大田微区试验相结合的方法，主要研究：①大气氨浓度升高对冬小麦根冠特征及光合生理特性的影响；②大气氨浓度升高对冬小麦氮素代谢及氮效率的影响；③大气氨浓度和介质供氮水平对冬小麦生长及氮代谢影响的交互作用。本项目旨在阐明大气氨浓度升高对C₃作物冬小麦生长和氮素代谢的影响机理，揭示植物生长对大气氨浓度升高的响应机制，为大田生产中作物对大气氨营养的高效利用以及农田氮素综合管理提供理论依据。

Ammonia is an important atmospheric pollutant and an important nitrogen source for field crops and some forest plants. Study on the effect mechanism of elevated atmospheric ammonia concentration on the growth and nitrogen metabolism of winter wheat is of great significance to enrich crop nitrogen nutrition theory and improve nitrogen utilization efficiency in farmland. Through the methods of potting, hydroponics and field micro-area test, using Open Top Chambers, OTCs and Dynamic Chamber, we took C₃crops, winter wheat, as index crops to study: 1) the effects of elevated atmospheric ammonia on root and shoot characteristics and photosynthetic characteristics of winter wheat; 2) the effects of elevated Atmospheric ammonia concentration on nitrogen metabolism and nitrogen efficiency in winter wheat; The interaction effects of atmospheric ammonia concentration and different nitrogen levels on the growth and nitrogen metabolism of winter wheat. The purpose of this study was to determine the mechanism of atmospheric ammonia nutrition affecting the growth and nitrogen metabolism of C3 plant winter wheat, and to provide a theoretical basis for high efficient utilization of atmospheric ammonia and crop nitrogen management in field production.