To speed up the afforestation in the Beijing area, besides afforestation, one of the effective way is to close hillsides to all intrusions into them. The purpose of this study is to find out an effective experimental method for closing hillsides to protect afforestation, and the indexes of the effectiveness the method.
Six experimental of 2 plots each were set up for this experiment and the environmental factors such as mother plant conditions, soil, water, vegetation coverage, diversity indexes and biomass were surveyed, respectively. Through comparison and analysis of the various types and their developing processes, we got the following results:
1. The main factor affecting the effects of closing a mountain for afforestation is the direction of the mountain slope, which is closely related with other environmental factors in the Beijing area are also more or less connected with water.
2. The biomass and coverage of shrubs and herbs will be increased by closing to the mountain to all intrusions by men and animals. Therefore, the indexes of the effectiveness of the closure method can be determined by means of comparison of the changes of the coverage and biomass of shrubs and herbs before and after the closure.
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