The remaining pear orchards are mainly found in some valleys along the Yellow River in Lanzhou,such as Anning,Shichuan,Qingcheng vallys and so on,where provide the main habitat of the famous Lanzhou pear.Besides of ecological and traveling values,the important of the orchards also shows their great values in providing of germplasm resources,nature-history cultural heritage in the city.It is found that there is only 2 570 pear trees remained cover with 183 hm2 in Lanzhou.Some survival issues of those trees a...
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