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探讨植物群落的变化,不仅可以为研究生态系统的结构和功能提供一定的理论基础,而且还可以为人类控制、改造和合理利用植物群落提供一定的理论依据。马衔山林区地处甘肃省榆中县南部,位于东经103°15′—104°10′,北纬35°38′—36°01′之间;海拔1800—3620米;年平均气温3.1—5.5℃;平均雨量550—700毫米。林区整个山势呈东南西北走向,长约60公里,宽30公里左右,面积大约1800平方公里,是我国西北地区黄土高原石质山地上的森林孤岛之一。
Exploring the changes of plant community can not only provide some theoretical basis for studying the structure and function of ecosystem, but also provide some theoretical basis for human control, transformation and rational use of plant community. Ma title mountain forest is located in southern Yuzhong County, Gansu Province, located in longitude 103 ° 15’-104 ° 10 ’, latitude 35 ° 38’-36 ° 01’; elevation 1800-3620 meters; annual average temperature 3.1-5.5 ℃; average rainfall 550-700 mm. The entire mountainous area is in the northeast, southwest and northwest. It is about 60 kilometers long and 30 kilometers wide with an area of about 1,800 square kilometers. It is one of the isolated forest islands on the stony mountainous land of Loess Plateau in Northwest China.