关键词: 粮食产量, 模型, 伊金霍洛旗, 退耕还林(草)

Abstract: It is expected that the optimum carrying capacity measurements of the Shei Shan main peak trail could be used for the national park management: 11～40 persons trekking at the same time is accepted in terms of social carrying capacity; a carrying capacity of 296 persons could be accommodated according to the facilities available in Shei Shan main peak trail; and maximum ecological carrying capacity of weekdays is 109 persons, while 218 persons in weekends or holidays. During the propagation period of rare species, it is 65 persons per day or no entry for trekking. It is suggested that long term monitoring should be carried out for recreation impact to the environment, per 3 or 5 years' time.

Key words: Crop yield, Model, Yijinhuoluo County, Conversion of cropland into forest and grassland areas