长白落叶松不同皆伐带宽对生物多样性的影响

Effect of Different Clear-cutting Band Widths of Larix olgensis Henry on the Bio-diversity

以黑龙江省佳木斯市孟家岗林场长白落叶松人工林为研究对象,采用3种带宽(15 m,30 m和50 m)进行带状皆伐,2年后对采伐后的林地和对照林分林下生物多样性情况进行调查分析,结果显示:带状皆伐后,草本植物、灌木植物和天然更新树种种类较对照增加,平均高也增加,并随着皆伐带宽的增大而增多;皆伐后喜光草本植物和灌木植物的重要值增加,耐阴植物重要值降低,草本植物的多样性和均匀度均低于对照林分,灌木植物的多样性和均匀度高于对照林分,皆伐带宽越大,草本多样性指数和均匀度指数就越低,灌木植物的多样性指数和均匀度指数就越高。

An experiment was clear-cutted by 3 band widths（ 15 m, 30 m and 50 m） on the Larix olgensis Henry plantation of Mengjiagang forest in Heilongjiang Province, the result under investigating and analyzing the bio-diversity in woodland after cutting and control plot show that： the species of herbaceous plants, shrubs and natural regeneration increased after the strip cutting and the average height was increased too with the increase of the bandwidth of the cutting. The important value of herbaceous and shrubs of bright light increased and that of low light decreased. The diversity and evenness of herbaceous plant were lower and that of shrubs were higher than the contrast, the diversity and evenness of herbaceous plant decreased and that of shrubs increased with the increase of the bandwidth of the cutting.