蝗虫是草地生态系统的重要组成部分，其种群动态变化对草地生产与生态功能及稳定性维持有至关重要的作用。当前，草地面临气候变化与人类活动的协同作用影响，本研究通过松嫩草地上的受控放牧实验和人工模拟降水格局变化实验平台，开展蝗虫种群数量变化与空间分布模式对不同放牧强度（无牧、中度放牧和重度放牧）与降水量变化（自然降水和增加降水）的互作的响应及其机制研究。通过对放牧与降水变化的互作影响下的蝗虫种群数量与空间格局变化的响应分析，深入理解蝗虫种群的发生规律以及人为干扰和气候变化的协同作用效应；通过对蝗虫种群数量与空间格局与植物群落和生境微气候等环境因子之间的相互关系分析，探讨放牧干扰与降水变化对蝗虫种群动态变化影响的作用机制。本研究对预测气候变化与人类活动影响下的蝗虫种群爆发动态、维持草地生态系统功能与可持续健康发展有重要的科学价值，同时为制定科学合理的草地管理措施以实现蝗灾可持续控制提供理论依据。

Grasshoppers are important components in grasslands, and their population dynamics play critical role for the functioning and stability of ecosystem. Currently, grasslands are susceptible to climate change and human disturbance. In this study, a field experiment with manipulated grazing intensity by large herbivores and simulated precipitation patterns in a meadow steppe will be conducted to examine the responses of the density and spatial patterns of grasshopper population to different grazing intensity (no grazing, moderate grazing, and heavy grazing) and changed precipitation patterns (natural precipitation, and increased precipitation) — the two important drivers in grassland ecosystems. The changes in grasshopper population dynamics and regulating effects of grazing and altered precipitation will be understood and recognized profoundly by studying the responses of the dynamics of density and spatial distribution of grasshoppers under different grazing intensity, increased precipitation, and their interactions in grasslands. The mechanisms of changed grasshopper population dynamics will be interpreted by analyzing the effects of grazing, altered precipitation, and their interactions on plant community diversity and composition, habitat microclimate, and the relationships between grasshopper dynamics and environmental factors in natural complex grasslands. This work will improve the understanding of the predictions on grasshopper outbreak under climate change and human disturbance, of the maintenances of ecosystem functioning, and of the sustainability of health in grasslands. Likewise, the research will provide the guide of drawing up scientific and reasonable grassland management strategies for controlling grasshopper outbreak.