Lying in the northern part of North China Plain, Beijing is surrounded by mountains on the west , the north and the northeast.
北京雄踞华北大平原北端，西部、北部和东北部则是群山环绕。
The effect of different rainfall years and different water and nitrogen management ways on winter wheat and summer maize was studied in northern part of north China Plain.
在华北平原北部研究了不同降水年型、不同水氮管理措施对冬小麦和夏玉米产量和氮素平衡的影响。
But it will be increased when replacing the grasslands by desert over northwest part of north China and it is caused by the increasing of the precipitation over northern part of north China.
在华北西北部以沙漠代替草原后，华北地区平均降水有所增加，这主要是由华北北部地区降水增加引起的。
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