三峡库区主要森林类型林分蓄积生长量研究

Stand Volume Growth of Different Forest Types in the Three Gorges Reservoir Area

以三峡库区林分蓄积生长量为研究对象,按库区主要森林类型、起源、密度进行划分,分类型布设标准地305块,采用材积差法确定林分蓄积生长量、生长率。结果表明,不同林分蓄积生长率有所差异,趋势为天然林蓄积生长率高于人工林;马尾松、柏木、栎类、其他阔叶树等林分,低密度时林分蓄积生长率较高;幼树所占比例较大的杉木林分,高密度林分蓄积生长率较高。研究结果为库区森林资源经营管理以及生态状况监测提供数据支持。

Stand volume growth（SVG）in the three gorges reservoir area was examined,305plots were layout which were divided into different forest types,origins and densities.SVGs were calculated by using volume difference method.The results showed that differences in SVGs existed among different stands.SVGs of natural forests were higher than artificial ones,low-density stands of Pinus massoniaina,Cupressus funebris,Quercus and other broadleaved species were higher than high-density ones.For Cunninghamia lanceolata stand which presented higher proportion of young trees,SVGs of high-density stands were higher than low-density ones.The result has important practical significance for forest management and ecological condition monitoring in the three gorges reservoir area.