• 论文 •

### 小兴安岭落叶松人工纯林近自然化改造对林下植物多样性的影响

1. 东北林业大学林学院 哈尔滨 150040
• 收稿日期:2009-11-12 修回日期:2010-10-07 出版日期:2011-01-25 发布日期:2011-01-25
• 通讯作者: 王庆成

### Effect of the Close-to-Nature Transformation of Larix gmelinii Pure Stands on Plant Diversity of Understory Vegetation in Xiaoxing’an Mountains of China

Zhang Xiangjun, Wang Qingcheng, Wang Shilei, Sun Qiang

1. Forestry College of Northeast Forestry University Harbin 150040
• Received:2009-11-12 Revised:2010-10-07 Online:2011-01-25 Published:2011-01-25

Abstract:

Changes in the understory plant species diversity in Larix gmelinii pure plantations were investigated after carrying on a close-to-nature stand transformation with different gap sizes and various soil disturbances, with conventional uniform thinning as the control. Increases in species number, quantity, coverage, mean height and diversity indexes (Simpson’s diversity index, Shannon-Wiener index, Pielou’s evenness index) of herbaceous species were detected in the transformed stands in the 1st and 2nd year; and significant differences ( P <0.05) were detected for all the indices except for evenness index in the 2nd year. Among the dominant herbaceous species, hygrophilous ones increased dramatically in the gaps of the transformed stands. No significant differences were found in species number, quantity, coverage, mean height and diversity index of herbaceous species with different gap size. In the 1st year after transformation supplemented with scratching the floor, the herbaceous species had significantly greater quantity,coverage and mean height in comparison to that without scratching the floor; but the differences diminished in the 2nd year. No significant differences in species number, quantity, coverage, mean height and diversity indexes of woody species were detected between the close-to-nature transformation and the ordinary uniform thinning. Our results suggest that the close-to-nature transformation favors the development of understory herbs, and promotes the diversity. However, more work should be done to determine the influence of the transformation and soil disturbances on the development of woody species.