约600,000至800,000只沙丘鹤只能使用位于内布拉斯加中部的几公里河流——人们已经用机械清理了这个地区的木本植被，使鸟类无法忍受。
Some 600, 000 to 800, 000 cranes use just a few miles of the river in central nebraska-areas that have been mechanically cleared of the woody vegetation that the birds can't tolerate.
约600,000至800,000只沙丘鹤只能使用位于内布拉斯加中部的几公里河流——人们已经用机械清理了这个地区的木本植被，使鸟类无法忍受。
Some 600,000 to 800,000 cranes use just a few miles of the river in central nebraska-areas that have been mechanically cleared of the woody vegetation that the birds can't tolerate.
结果表明：1。退化生态系统木本植物的密度与植被的恢复阶段紧密相关；
The main results are as follows: 1 . Woody plant density in degraded ecosystem is in close relation with restoration stage of vegetation.
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