本项目将通过设置野外农田模拟增温（FATI）与对照控制试验，开展两种温度情景下青稞的初级生产力、作物产量、光合特性与单叶光合参数、以及耕层土壤有机碳贮量、CO2排放与有机物分解速率的比较研究。在此基础上，探讨并揭示西藏高原农田生态系统青稞生产力与土壤有机碳贮量、CO2排放、有机物分解对温度升高的响应规律，并进一步探讨高原农田生态系统青稞初级生产力与CO2排放、土壤有机碳分解对未来气候变暖温度升高的响应差异及其内在联系。本项目的研究成果对提高西藏高原地区农田生态系统应对气候变化的能力，实现气候变化条件下农田青稞可持续生产将具有重要的理论与实践意义。

The primary productivity and grain yield, photosynthetic characteristics and leaf photosynthetic parameters of hulless barley, topsoil organic carbon quantity, rates of CO2 emmission and soil organic matter decomposition in farmland eco-system in Tibet Plateau will all be studied comparatively in this research work under two temperature conditions by means of a simulated warming system of FATI. On the basis of the research works above, the temperature acclimation regulations of the primary productivity of hulless barley and topsoil organic carbon quantity and rates of soil CO2 emission and soil organic matter decomposition will be discussed. And the acclimation differences between the primary productivity of hulless barley and soil CO2 emission and soil organic matter decomposition in farmland eco-system to temperature increase through simulated warming will be discussed furtherly. The results of this research work will enhance the adaptation ability of farmland eco-system to climate change, and will be of theory and practice importance to realize the production sustainability of hulless barley in the Tibet Plateau.