t was found that all of the existing models and in dexes for climate-plants relahonshipwhich were tnainly used in the spatial classification of vegetation and climate were not suit-able to analyze the dynamics of climate and plants in the ecotone on the Ordos Plateau whichis typical in north China with an obviously changed climate a response-sensitive ecosystem.For this reason,a climate-plants growth index(CPGI)which can be used to describe thecharacteristics of climate in the ecotone was constructed,based ...