基于Holdridge分类系统的华北地区主要草原群系的水热分布
Hydrothermal Distribution of Major Grassland Groups in North China Based on Holdridge Classification System

根据华北地区草原群系分布资料和气象数据，利用Holdridge生命地带分类系统计算了华北地区36种主要草原群系的年生物学温度(ABT: Annual biotemperature)、年可能蒸散量(APE: Annual potential evapotranspiration)、年降水量(P: Precipitation)和可能蒸散率(PER: Potential evapotranspiration ratio)，定量分析了华北地区草原分布的气候规律。综合年平均生物温度和可能蒸散率两个气候指标将36种主要草原群系划分为5个水热指标类群，分别为寒温带亚湿润型、寒温带湿润型、中温带半干旱型、中温带亚湿润型和中温带湿润型。
The annual biotemperature (ABT), annual potential evapotranspiration (APE), annual precipitation (P) and potential evapotranspiration rate (PER) of 36 major grassland group systems in North China were calculated using the Holdridge Life Zone Classification System based on the distribution information and meteorological data of the grassland group systems in North China. A quantitative analysis of the climatic patterns of grassland distribution in North China was conducted. The two climate indicators of integrated mean annual biotemperature (ABT) and potential evapo-transpiration rate (PER) classified 36 major grassland groups into five hydrothermal indicator taxa, namely, cold-temperate sub-humid, cold-temperate humid, moderate-temperate semi-arid, moderate-temperate sub-humid, and moderate-temperate humid.