Integrated Orderly Classification of Grassland in Tianzhu County and Evaluation of Ecosystem Service Value

Based on integrated orderly classification system of grassland,and by using data from 117 meteorological stations,the grassland in Tianzhu county could be classified into 6 classes,including cold temperate-semiarid mountainous steppe,cold temperate-subhumid mountainous meadow steppe,cold temperate-humid mountainous meadow,cool temperate-semiarid temperate typical steppe,cool temperate-subhumid meadow steppe and cool temperate-humid forest steppe.At the same time,the ecosystem service value of grassland was evaluated according to land-use type,degradation level and production grade of grassland.The results showed that the total ecosystem service value of grassland in Tianzhu was 568.5 millions RMB Yuan per year,in which,the contribution proportion of temperate-subhumid meadow steppe was the highest(31.52%),and that of cold temperate-semiarid mountainous steppe was the lowest(8.45%).