Impact of gap size and light intensity on activity of soil phosphatase enzyme in Beech stands ‎‎(case study; control plot:Langa-Kelardasht)‎

Gaps are disturbances that cause creating and increasing of biodiversity in forest. Studying of soil ýphysico-chemical properties and soil biology could improve our knowledge for appropriate ýmanagement and silvicultural operations in forest. This research was performed in natural gaps of ýcontrol plot at Kelardasht region, northern Iran. Sampling was done at 0-20 cm of top soil in gaps ýwith different sizes and phosphorus content, acid phosphatase and alkaline phosphatase activity was ýassessed by substrate reaction by spectrophotometer. The results showed that gap size has no ýstatistical significant difference on phosphatases activity. While enzyme activity decreases with ýincreasing light intensity up to medium intensity that indicates reduction in fungal coverage ). The ýphosphatase activity increases in the higher light intensity class because of increasing in bacterial ýpopulation in higher light intensity.Perhaps we can know large gap size(400-300m2) and very much ýlight intensity(>25%) as an adequated gap size and light intensity also it needs more monitoring.ý