河西走廊酒泉绿洲农田防护林格局与结构

吕王亦庄, 赵文智

The structure and pattern of farmland shelterbelts in Jiuquan Oasis of Hexi Corridor

Wangyizhuang Lv, Wenzhi Zhao

图5 实地带斑比频率分布

Fig.5 Frequency distribution of ration of belt to patch of field survey