This study of the impact of heart rot of <i><span style="font-family:Verdana;">Pericopsis elata</span></i><span style="font-family:Verdana;"> on logging yield was cond...This study of the impact of heart rot of <i><span style="font-family:Verdana;">Pericopsis elata</span></i><span style="font-family:Verdana;"> on logging yield was conducted in Libongo, in three logging concessions of the </span><i><span style="font-family:Verdana;">Société d'Exploitation Forestière et Agricole du Cameroun</span></i><span style="font-family:Verdana;"> (SEFAC). An inventory of 92 </span><i><span style="font-family:Verdana;">P. elata</span></i><span style="font-family:Verdana;"> stumps in four Annual Cutting Areas (AACs) divided among three Forest Management Units (FMUs) distinguished by Minimum Operating Diameter </span><span style="font-family:Verdana;">(MOD) revealed that 22 stumps were rotten. Decay was visible on stumps wit</span><span style="font-family:Verdana;">h a diameter of more than 100 cm with a frequency of occurrence of 23.91%, a percentage of abandonment of 55.20% and a yield of 44.79%. The most important economic loss was revealed on 9 abandoned whole logs that cumu</span><span><span style="font-family:Verdana;">lated a volume of 145.547 m</span><sup><span style="font-family:Verdana;">3</span></sup><span style="font-family:Verdana;">. The correlation between the diameter of the</span></span><span style="font-family:Verdana;"> stumps and that of the decay gives a coefficient or correlation rate r = 0.31. The MOD for </span><i><span style="font-family:Verdana;">P. elata</span></i><span style="font-family:Verdana;"> could be 80 cm and covers the biological risk class. The results indicate that </span><i><span style="font-family:Verdana;">P. elata</span></i><span style="font-family:Verdana;"> shows an increasing gradient of decay rate with increasing tree diameter, resulting in a loss of material for larger diameter trees, and consequently a decrease in material yield at processing.</span>展开更多
Pinus koraiensis,as the top zonal plant in Northeast China,is affected by external conditions and favorable environmental factors in nature,and grows through its internal contradictory movement.Under certain condition...Pinus koraiensis,as the top zonal plant in Northeast China,is affected by external conditions and favorable environmental factors in nature,and grows through its internal contradictory movement.Under certain conditions,it is also affected by some adverse environmental factors,resulting in disasters.With the diseases infecting P.koraiensis in Liaoning area(bark rot,needle-shedding disease,pine dry blight,pine white rot and pine heart rot)as the research objects,the control methods against P.koraiensis diseases are explored,in order to provide reasonable technology measures for disease and pest control in Liaoning area.展开更多
文摘This study of the impact of heart rot of <i><span style="font-family:Verdana;">Pericopsis elata</span></i><span style="font-family:Verdana;"> on logging yield was conducted in Libongo, in three logging concessions of the </span><i><span style="font-family:Verdana;">Société d'Exploitation Forestière et Agricole du Cameroun</span></i><span style="font-family:Verdana;"> (SEFAC). An inventory of 92 </span><i><span style="font-family:Verdana;">P. elata</span></i><span style="font-family:Verdana;"> stumps in four Annual Cutting Areas (AACs) divided among three Forest Management Units (FMUs) distinguished by Minimum Operating Diameter </span><span style="font-family:Verdana;">(MOD) revealed that 22 stumps were rotten. Decay was visible on stumps wit</span><span style="font-family:Verdana;">h a diameter of more than 100 cm with a frequency of occurrence of 23.91%, a percentage of abandonment of 55.20% and a yield of 44.79%. The most important economic loss was revealed on 9 abandoned whole logs that cumu</span><span><span style="font-family:Verdana;">lated a volume of 145.547 m</span><sup><span style="font-family:Verdana;">3</span></sup><span style="font-family:Verdana;">. The correlation between the diameter of the</span></span><span style="font-family:Verdana;"> stumps and that of the decay gives a coefficient or correlation rate r = 0.31. The MOD for </span><i><span style="font-family:Verdana;">P. elata</span></i><span style="font-family:Verdana;"> could be 80 cm and covers the biological risk class. The results indicate that </span><i><span style="font-family:Verdana;">P. elata</span></i><span style="font-family:Verdana;"> shows an increasing gradient of decay rate with increasing tree diameter, resulting in a loss of material for larger diameter trees, and consequently a decrease in material yield at processing.</span>
文摘Pinus koraiensis,as the top zonal plant in Northeast China,is affected by external conditions and favorable environmental factors in nature,and grows through its internal contradictory movement.Under certain conditions,it is also affected by some adverse environmental factors,resulting in disasters.With the diseases infecting P.koraiensis in Liaoning area(bark rot,needle-shedding disease,pine dry blight,pine white rot and pine heart rot)as the research objects,the control methods against P.koraiensis diseases are explored,in order to provide reasonable technology measures for disease and pest control in Liaoning area.