Grey correlation analyses show that at the time axis , the factors influencing the diversity of plants strongly are primary productivity , annual precipitation , relative humidity , mean temperature in january , and potential evaporation etc . the spatial distribution pattern of terrestrial vertebrates including mammals , birds , reptilians and amphibians were studied with methods similar to those for plants . 7 d 通过d以排序表明, d以第一轴与多个环境因子均呈显著相关,其中与经度、年均温、年均降水量、年均相对湿度、潜在蒸发量、初级生产力呈正相关,与纬度、海拔、年均风速、寒冷指数、年均日照率呈负相关。