Stand Structure and Dynamics of Pinus densiflora Forests Damaged by Pine Wilt Disease in the Southern Part of Okayama Prefecture.
Stand Structure and Dynamics of Pinus densiflora Forests Damaged by Pine Wilt Disease in the Southern Part of Okayama Prefecture.
复制标题
冈山县南部松材线虫病危害的赤松林林分结构和动态。
DOI：
10.7211/jjsrt.21.18
复制
发表时间：
1995
期刊：
影响因子：
--
通讯作者：
K. Yoshikawa
中科院分区：
文献类型：
--
作者：
K. Sakamoto;Noriyuki Fujikawa;K. Chiba;K. Yoshikawa
为探讨松材萎蔫病对冈山市城市边缘地区浓密松林林分结构的影响，以2个受损林分和1个未受损林分为研究对象。1个受损林分对枯死松树进行了选择性采伐，另1个受损林分未对松树进行保护。研究林分的林分结构各不相同。2个受损林分的生物量均因松材枯萎病损害而减少。在进行选择性采伐的受损林分中，林下生物量显著减少。在未破坏林分和未保护的破坏林分中，常绿阔叶林种以小级丰富，在林下占优势。在选择性采伐的受损林分中，落叶阔叶物种以小种级丰富，以林下植物为主。认为选择性采伐干扰了林分的林下层，造成了遮荫不耐种的产生。从直径增量的分析可以推测，在病害爆发后，残树的生长速度加快。分析认为，由于松材枯萎病导致密松冠层树木死亡而减少，因此残存树木从抑制中释放出来。研究表明，松材枯萎病加速了松林的演替。然而，选择性采伐破坏了林分，减缓了林分演替。
In order to explore the effects of pine wilt disease on the stand structure of Pinus denszflora forests in urban fringe areas of Okayama City, we researched two damaged forest stands and one undamaged forest stand. In one of the damaged stands, selective felling of dead pine trees were conducted, and in the other damaged stand, no operations to protect pine treees were conducted. Stand structures varied in the studied stands. Biomass in the two damaged stands were reduced by pine wilt disese damage. In the damaged stand where the selective felling operation was conducted, biomass of the understorey was remarkably reduced. In both the undamaged stand and the damaged stand without protection, evergreen broad-leaved species were abundant in small size classes and were predominate in the understorey. In the damaged stand with the selective felling operation, deciduous broad-leaved species were abundant in small size classes and were predominate in the understorey. It was thought that the selective felling operation disturbed the understorey of the stand and this disturbance caused the establishment of shade intolerant species. From the analysis of diameter increments, it was presumed that the grawth of remnant trees had been accelerated after the outbreak of the disease. It was assumed that the remnant trees had been released from the suppression because the canopy trees of P.densiflora were dead and thus decreased by pine wilt disease. From our research we concluded that pine wilt disease accelerated the succession of the pine forests.However, selective felling operations disturbed the forest stand and decelerated the succession.