褐马鸡居留地的变迁与环境演替

THE CHANGING OF CROSSOPTILON MANTCHURICUMS' RESIDENCE AND ENVIRONMENT EVOLUTION

褐马鸡源于第三纪暖温气候条件下,经第四纪环境变迁演化获得了新的遗传因子,现为暖温带北部与中温带南部的一种森林留鸟.曾分布在大同盆地、潞安盆地,甚至豫西山地。后来,由于人类的干扰和生态坏境的渲替超越了它生活所需要的阈值,被迫迁徙到人类活动较微弱的中山地带,可以设想,随着我国生态环境的恢复,山区植被复盖率达到65％以后,我国海拔1800米以上的华北山地必将有成群的褐马鸡出现.

The crossoptilon mantchuicum orginated under the tertiary period warm weather condition and it got new genetic genes through the Quaternary period enviromen tal changes and evolution.now, it is forest resident bird distributing Over the north of warm temperature zone and over the sorth of moderate temperature zone.It once distrabuted Over Datong basin, luan basin and even the mountainous region of the west of He na.later because human beings interrene and ecologic environment succession surpass the threshold value neaded in its living, the cross——optilon mantchuricum had to migrate to middle mountainous region on which there is less human activity.it can be expected that when mountainous region is 65 percent vegetation covered with the rehabilition of ecologic environment in out country, flocks of the crossoptilon mantchuricum will appear on the elevation of 1800m of north china mountainous region.