Spatio-temporal variations in the thermal requirement of the first flowering dates of Salix babylonica and Ulmus pumila in China during 1963-2018
TAO Zexing, GE Quansheng, WANG Huanjiong
Acta Geographica Sinica . 2020, (7): 1451 -1464 .  DOI: 10.11821/dlxb202007009