%0 Journal Article
%T The effect of Forest canopy Decrease in runoff amount on shafarood basin
%A Sh. Sobh Zahedi
%A M. Alidoust
%A M. R. Pournasrollah
%J International Journal of Forest, Soil and Erosion
%D 2012
%I GHB's Journals
%X Many factors interfering in flooding of a watershed such as climatological characteristic (precipitation), cover diversity and physiography, The only factor which interfering on watershed could be precipitation of independent variable and harvest. The other factors mostly stable. The present research try to establish link between climatological effects and forest cover decreasing with maximum debi discharge and trying to assess interplay of two natural parameters on flooding within two determined period beforee and after harvesting. By applying precipitation data, number of harvested trees along with watershed debi before and after harvesting by using of regression method and correlation coefficient for each independent variable .There is a regular relation for each independent variable with increasing precipitation debi base wich shown an increasing, Meanwhile before harvesting start (from 1978) in spite of decreasing in precipitation ratio we observed that the debi amount has increased. The study basin more able mean shown among 2,3 and 5 annual precipitation determined that before harvesting the area got enough water but after harvesting (in 1985 and soon) annual precipitation decreased but debi ration with respect to the last year increased. By accessing the mean debi in harvesting seasons the observation shown that before harvesting months, the water regime in study area imitating of precipitation with autumn and peak debi could be observed, in winter season. It is in least range but by evaluating after harvesting observation denoted that in winter season. There is pseudo peak, by comparing with last year precipitation observation shown that range of debi has increased but in winter this debi could be equal with autumn debi. Statistical data of pounel station debi from beginning up to now shown the daily debis from december till march in shafarood river in past years before harvesting had been monotonous and this variablities had been from 2 to 3 m2 but this amount increased after harvesting years and it had been variable between 6 to 9 m2 after 1978 (year) precipitation rate has decreased. This change was due to forest utilization which caused limitation area in forest. By evaluating after harvesting in shafarood basin water regime has got a regular link with precipitation regime, meanwhile with respect to forest utilization data, we can observed that in winter season maximum debi, high water volume and multi water in autumn. Therefore it is necessary to select a utilization method which could be appropriate with selected management method in the
%K Utilization - Root ¨C Runoff ¨C Shafarood ¨C Gilan
%U http://www.ijfse.com/index.php/IJFSE/article/view/53