Breeding Ecology of Jankowski′s Bunting in the Dry Grassland in Baicheng, Jilin Province Microsporogenesis and Variation in Pollen Size of Populus×xiaozhuanica ‘Baicheng-2’ Preliminary Studies on Algae from Four Lakes of Baicheng and Songyuan in Jilin Province, China Study on Saperda populnea Harming Populus × xiaozhuarica cv. ‘Baicheng‘