北方寒旱区草原湖泊湖岸带生态系统在典型气候条件下，其植被生态需水过程存在其特殊性。以实测数据和调查数据为基础，应用统计数学、地质数学、模式辨识、遥感、稳定同位素等方法，将湖岸研究区按照植被类型的分布和放牧制度情况进行分区，分析放牧制度对其特征因子影响，建立起湖水与地下水补给响应关系，分析研究区内的植被、气象、土壤、景观生态、生态过程的水文响应机制的时空变化特征，在前期资料的基础上采集土壤水、湖水、地下水、雨水、雪水、植被水样品，测定其稳定同位素δD、18O，采集各个生长期内的植被叶片测定其稳定同位素δ13C，对比分析各样品中的δD、18O、δ13C的分布特征，确定湖岸植被生态需水选择利用机制，并建立参考作物系数模型和冠层涌源模型，对湖岸带植被蒸散发量进行模拟，探讨不同放牧制度下湖岸植被需水蒸发过程机制，揭示不同放牧制度下生态水文环境机理及演变过程。

The process of ecological water requirement for vegetation of the cold and arid area in the north shore of Grassland Lake ecosystem has its particularity under its typical climatic conditions.Based on the measured and investigated data,set the shore study area into different parts according to the distribution of vegetation types and grazing systems,using statistical mathematics ,geology mathematics, pattern recognition, remote sensing, stable isotopes and such methods , analysis the impact of grazing system to its special factors,set up the recharge response relationship between water and groundwater,analysis the temporal variation characteristics of hydrological response mechanism between Vegetation, meteorology ,soil, landscape ecology and ecological process,collect soil water, lake water, groundwater, rain, snow, vegetation water samples on the basis of preliminary data acquisition,make the determination of the stable isotopes δD、18O, collect the vegetation leaf blade in different growth period,measure its stable isotopeδ13C, comparison and analysis the distribution characteristics of δD、18O、δ13C in each sample,determine the use mechanism of lake shore ecological water requirement for vegetation, and establish the reference crop coefficient model and canopy sites model to simulate the vegetation evaporation quantity,explore the process mechanism of lake shore water requirement and evaporation for vegetation under different grazing systems,revealing the ecological and hydrological environment mechanism and evolution process under different grazing system.