The phenological variation of Elymus nutans during recent 20 years at the side slope conditions in the Northeast region of QinghaiXizang PlateauA case study of Hezuo

Based on simultaneous data of Elymus nutans growth and meteorological factors, the phenological variation of E. nutans during recent 20 years at the side slope conditions in the Northeast region of QinghaiXizang Plateau was determined by the SPSS 13.0 statistical software in this study. This study showed that the phenological phase of E. nutans appeared earlier, in which the date of ear and bloom showed the obviously earlier by 1.50 d/a and 1.58 d/a due to global warming, and the maturate date of E. nutans seed did not change. The growing season in the Hezuo region during recent 20 years prolonged by 1.5 d/a, correspondingly, the growing season of E. nutans in Hezuo prolonged by 3.4 d/10a.