ABSTRACT Forest harvesting was considered as one of the most important and main objectives of for... more ABSTRACT Forest harvesting was considered as one of the most important and main objectives of forest management system an essential activity in forest management that in any way to run, it will remain damages to residual stand. But improved harvesting method can reduce these effects. One of these methods is use of directional felling. In this study tried to impact of directional felling on number of damaged trees in both felling and winching operations and also time of felling and winching investigated. Observation and measuring was carried out in Neka-Choob forests. Number of 84 trees from total marked trees was selected and from among marked trees, direction felling of 42 trees with help of plan supervisor determined and falling path of selected trees was specified by paint on the trunk of trees, before felling operation. Time of winching and felling and damages to marginal trees, was recorded, in both felling and skidding operations. Results of felling phase showed that average net time of cutting tree in directed group 2.95 minutes, while this value in undirected group 4.04 minutes, were recorded. Also, more number of surrounding trees with diameter greater than 10 cm was damaged in undirected trees (100 vs. 25 trees). Comparison time of winching in undirected trees showed that this time was more 2 time in directed trees, and also more number of marginal trees with greater diameter than 10 cm, in undirected trees was damaged (50 vs. 14 trees).
Tree volume estimation to calculate forest fee is time consuming and costly. furthermore, long te... more Tree volume estimation to calculate forest fee is time consuming and costly. furthermore, long term stock cut logs under warm and humidity condition results in decay.The current study was done to develop regression model to estimate comercial volume of logs using independent variable such as diameter at breast height , the trunk and etc, in the compartments 313 and 314 in the Research and Educational Forest of Tarbiat Modares University. For this purpose, diameter at breast height (DBH), diameter at end of trunk (DET), the height of the tree trunk and total height of 101 trees were measured using the VERTEX and the Image Tools software. Volume of renewing and extraction operations using as dependent variables in volume estimation model designing. Results showed that in preparing model for the renewal volume operation, diameter at breast height and total tree height and in preparation model for extraction operation, diameter at breast height, diameter at the end of the trunk and trun...
... References. Blackard, JA Dean, DJ 1999. Comparative accuracies of artificial neural networks ... more ... References. Blackard, JA Dean, DJ 1999. Comparative accuracies of artificial neural networks and discriminate analysis in predicting forest cover types from cartographic variables. ... Kia, M. 2010. Neural network in MATLAB. Kian Rayaneh Sabz Publisher. 229 pp. ...
... References. Blackard, JA Dean, DJ 1999. Comparative accuracies of artificial neural networks ... more ... References. Blackard, JA Dean, DJ 1999. Comparative accuracies of artificial neural networks and discriminate analysis in predicting forest cover types from cartographic variables. ... Kia, M. 2010. Neural network in MATLAB. Kian Rayaneh Sabz Publisher. 229 pp. ...
ABSTRACT Forest harvesting was considered as one of the most important and main objectives of for... more ABSTRACT Forest harvesting was considered as one of the most important and main objectives of forest management system an essential activity in forest management that in any way to run, it will remain damages to residual stand. But improved harvesting method can reduce these effects. One of these methods is use of directional felling. In this study tried to impact of directional felling on number of damaged trees in both felling and winching operations and also time of felling and winching investigated. Observation and measuring was carried out in Neka-Choob forests. Number of 84 trees from total marked trees was selected and from among marked trees, direction felling of 42 trees with help of plan supervisor determined and falling path of selected trees was specified by paint on the trunk of trees, before felling operation. Time of winching and felling and damages to marginal trees, was recorded, in both felling and skidding operations. Results of felling phase showed that average net time of cutting tree in directed group 2.95 minutes, while this value in undirected group 4.04 minutes, were recorded. Also, more number of surrounding trees with diameter greater than 10 cm was damaged in undirected trees (100 vs. 25 trees). Comparison time of winching in undirected trees showed that this time was more 2 time in directed trees, and also more number of marginal trees with greater diameter than 10 cm, in undirected trees was damaged (50 vs. 14 trees).
Tree volume estimation to calculate forest fee is time consuming and costly. furthermore, long te... more Tree volume estimation to calculate forest fee is time consuming and costly. furthermore, long term stock cut logs under warm and humidity condition results in decay.The current study was done to develop regression model to estimate comercial volume of logs using independent variable such as diameter at breast height , the trunk and etc, in the compartments 313 and 314 in the Research and Educational Forest of Tarbiat Modares University. For this purpose, diameter at breast height (DBH), diameter at end of trunk (DET), the height of the tree trunk and total height of 101 trees were measured using the VERTEX and the Image Tools software. Volume of renewing and extraction operations using as dependent variables in volume estimation model designing. Results showed that in preparing model for the renewal volume operation, diameter at breast height and total tree height and in preparation model for extraction operation, diameter at breast height, diameter at the end of the trunk and trun...
... References. Blackard, JA Dean, DJ 1999. Comparative accuracies of artificial neural networks ... more ... References. Blackard, JA Dean, DJ 1999. Comparative accuracies of artificial neural networks and discriminate analysis in predicting forest cover types from cartographic variables. ... Kia, M. 2010. Neural network in MATLAB. Kian Rayaneh Sabz Publisher. 229 pp. ...
... References. Blackard, JA Dean, DJ 1999. Comparative accuracies of artificial neural networks ... more ... References. Blackard, JA Dean, DJ 1999. Comparative accuracies of artificial neural networks and discriminate analysis in predicting forest cover types from cartographic variables. ... Kia, M. 2010. Neural network in MATLAB. Kian Rayaneh Sabz Publisher. 229 pp. ...
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