老山生态实验站森林资源的消长

采用GIS技术对黑龙江省帽儿山林场老山生态实验站1983年和1999年的森林资源消长状况作了对比分析，结果表明：老山生态实验站16年间森林覆盖率降低；天然次生林分布范围缩小，人工林栽培面积增加；中龄林、近熟林、成熟林所占比例加大，幼龄林比例减少；主要优势树种樟子松、落叶松、红松、柞树的分布差异显著，落叶松分布面积缩小而红松分布范围扩大；胸径大于10cm的优势树种，1999年的分布范围比1983年有所增加。

The Changes of Forest Resources in Laoshan Experimental Station

A study was conducted to compare the changes of forest resources in Laoshan Experimental Ecological Station of Maoershan Forest Farm, Heilongjiang Province between 1983 and 1999 with the help of the Geographic Information System (GIS) technology. The result illustrates that the total forest distribution area in Laoshan Experimental Ecological Station has decreased. The distribution area of natural secondary forests has reduced while that of man-made forests has increased. The composition percentage of middle-aged forests, pre-mature forests and mature forests has increased but that of young stands has declined improperly. The distributions of the mainly dominant species such as Pinus sylvestris, Larix, Pinus koraiensis and Quercus mongolica have also changed in a certain degree. The distribution area of Larix has decreased and while that of Pinus koraiensis has extended. The distribution areas of some mainly dominant species with the average diameter at breast height larger than 10cm have increased.