Examining Relationships between Heat Requirement of Remotely Sensed Green-Up Date and Meteorological Indicators in the Hulun Buir Grassland. - Jian Guo; Xiuchun Yang; Fan Chen; Jianming Niu; Sha Luo; Min Zhang; Yunxiang Jin; Ge Shen; Ang Chen; Xiaoyu Xing; Dong Yang; Bin Xu 008 (Remote. Sens., 2021)