National Engineering Laboratory for Forest Tree Breeding;
Key Laboratory for Genetics and Breeding of Forest Trees and Ornamental Plants of Ministry of Education;
College of Biological Sciences and Technology;
Beijing Forestry University;
Beijing 100083;
China;
Qigou State-owned Forest Farm;
Pingquan 067509;
Hebei;
China;
Huixian State-owned Forest Farm;
Xinxiang 453636;
Henan;
China;