密云古石峪封山育林试验方法

要加速北京地区的绿化，除造林外，封山育林是一种有效办法。本次试验的目的就是探讨一个封山育林试验方法，寻找检查封育效果的指标。本次试验设置样地6组，12块，分别测定了环境因子、母树条件、土壤水分、植被盖度，多样性指数和生物量。通过对各测定因子进行横向(类型)和纵向(历史)的比较看出：(1)影响封育效果的主要是坡向，坡向与水分条件密切相关，其它因子也与水分相关；(2)灌木、草木植物的盖度和生物量经封山育林后有所提高。所以草、灌的盖度、牛物量等的变化可作为乔木更新前封育效果的指标。

AN EXPERIMENTAL METHOD FOR CLOSING HILLSIDES TO FACILITATE AFFORESTATION IN GUSHIYU,MIYUN COUNTY,BEIJING

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.Theref- ore, the indexes of the effectiveness of the closure method can be deter- mined by means of comparison of the changes of the coverage and biom- ass of shrubs and herbs before and after the closure.