136 uppsatser · sida 5 av 10
en studie av 21 drabbade objekt i södra Sverige
… considered. Therefore, the study gives no representative picture of the normal thinning performed by Sydved. To find out if it was possible to improve the planning procedures interviews were made with one machine operator from each district and district managers The average age …
… site index, basal area weighted mean diameter and a variable that indicates thinning within ten years before the inventory. Diameter is the only class variable. The model in this paper has its roots in Leslie and Lewis’s growth models. Their model was constructed to study animal …
Två fältstudier vid Asa försökspark
Den här uppsatsen grundar sig på två fältstudier i nyutlagda demonstrationsförsök på Asa försökspark som ska användas i utbildningssyfte. Studie 1 bestod av försöksytor i ett 13 år gammalt bestånd som röjts till samma röjningsförband men med tre skilda metoder; motormanuell …
… stand characteristics that make the stands more suitable for pulpwood in early thinning, or if it is better to apply whole tree harvest. The study shall also give an indication if bio energy can be an economical interesting alternative for Sveaskog. Sampled trees represented the …
det operativa traktvalets påverkan på den säsongsmässiga uthålligheten i ett bolagsdistrikts traktbank
… forest during the year and that it foremost is the proportion of winter thinning of own forest that has increased in the stand bank. Fore instance the proportion of thinning of own forest in the stand bank that could only be cut during winter increased from 24 % to 37 % between …
… vegetation. Changes over time from the young-stand phase (10-15 years old) to thinning phase (about 40 years old): ” The cover percentage without field vegetation has increased from about 10 to 20 %. ” The cover of wavy hair grass decreased from 65 to 35 %, while the cover of …
… hours may increase the risk for longer waiting times. The proportion of thinning wood of total transported volume had a negative influence on the carried load weight for haulage contractors with self-loading trucks. The negative influence of thinning wood was greater on lighter …
… composition in order to identify stands which can be of current interest for thinning. The study also includes how the aerial photo material and experience of the interpreter can influence the quality of the interpreted variables. The aerial photo interpretations were made by …
… forest owners association, Södra skogsägarna, has developed a new method for thinning inventory. The purpose of this study is to evaluate the method that is used for self-checking and to find ways to develop and improve of the method. The data has been collected by inventory in …
… except when it comes to silviculture, such as planting and pre-commercial thinning where 22 % of the respondents declare that they are partly unsatisfied with the services. For services related to thinning more than 32 % declare that they are very satisfied.Even if the members …
… of the timber deal were identified: 1) from signing of the contract until thinning, 2) from thinning until finishing of transportation and 3) from finishing of transportation until final account of the contract. The questioner study revealed that the majority of the forest …
Röjning är en skötselåtgärd som påverkar det framtida beståndets utveckling och skördeutfall. Olika och delvis motstridiga mål måste beaktas vid röjningstillfället. I praktiken blir många bestånd röjda mer än en gång. En orsak till upprepad röjning är att det kan uppstå behov av …
… equipped with accumulating harvester heads and forwarders, in first commercial thinnings were an integrated harvest of pulpwood and energy wood were performed. In the beginning the plan was to study and measure 20 sites before and after harvest. Due to storms during the summer …
… study is to investigate the productivity effects of multiple tree handling in thinnings. Other important elements have been to investigate in which extent multi-tree handling is used in stands with different stem volumes and the impact of collecting partially delimbed fuelwood …
… The study shows that multiple tree handling harvesters are more efficient in thinnings stands with mean stock volumes less than 0,12 m3fub per stock. The increased efficiency is different for different mean stem classes. In stands with a mean stem volume of 0,04 m3fub per stock …
