Tree growth as an effect indicator of silvopastoral systems in the low hilly area of western Henan province, China oleh Peisong Liu, Peisong Liu, Fan Cheng, Fan Cheng, Xinlong Wang, Zhipeng Liu, Liping Cheng, Liping Cheng, Weishuang Tong, Weishuang Tong, Guang Qi, Guang Qi, Lixuan Kou, Lixuan Kou