【摘要】 青藏高原是世界上海拔最高的高原，具有重要的生态、战略和发展意义，但其农业发展面临低温、干旱和土壤退化等挑战.本文阐述了第二次青藏高原综合科学考察研究任务三生态系统与生态安全专题三“农田生态系统与粮食安全”的科学考察背景、思路、研究目标以及取得的新的阶段性进展，旨在揭示农田生态系统结构与功能的时空变化及驱动机制，提出优化管理方案以保障粮食安全和可持续发展.本期专题论文研究聚焦农田土壤管理、气候变化、农业生产潜力、作物培育、碳平衡、作物品质与利用等方面，结合遥感、建模等技术，提出应对气候变化和农业资源利用的策略，为区域农业绿色可持续发展提供科学依据和政策支持.未来研究将进一步关注气候变化影响及农业发展与生态保护的协同机制，推动“农-林-牧”复合生态系统建设和农旅融合高质量发展，以实现粮食生产、生态保护和经济建设的多重目标.（参70）更多还原

【Abstract】 The Qinghai-Xizang Plateau is the highest plateau in the world, holding critical ecological, strategic, and developmental importance. However, agricultural development in this region encounters substantial challenges,including low temperatures, drought, and soil degradation. This article outlines the background, conceptual framework, research objectives, and advancements in the third task of the Second Tibetan Plateau Scientific Expedition and Research Program, focusing on “Farmland Ecosystems and Food Security.” This study aimed to investigate the spatiotemporal dynamics and driving mechanisms of farmland ecosystems and develop optimized management strategies to ensure food security and sustainable development. This special issue addresses crucial aspects such as farmland soil management, climate change adaptation, agricultural productivity, crop breeding, carbon balance, and crop quality and utilization. Strategies have been proposed to address climate change and optimize the use of agricultural resources by integrating remote sensing, modeling, and other advanced methodologies. These initiatives seek to provide robust scientific evidence and policy recommendations to facilitate green and sustainable agricultural development in the region. Future research should further explore the impact of climate change and promote the integration of agricultural and ecological systems. It aims to develop a diversified “agriculture-forestry-animal husbandry” composite ecosystem, striving to achieve the interconnected objectives of food production, ecological conservation, and economic development.更多还原