| 水曲柳幼苗对杂草竞争的生理生态反应 |
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| 引用本文： | 梁建萍,张莉,李鲜花,李雪芬.水曲柳幼苗对杂草竞争的生理生态反应[J].山西农业大学学报(自然科学版),2005,25(2):131-134. |
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| 作者姓名： | 梁建萍 张莉 李鲜花 李雪芬 |
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| 作者单位： | 山西农业大学林学院山西太谷030801 |
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| 摘 要： | 杂草竞争是影响幼苗生理生态学过程及生长的重要因素。以珍贵的阔叶用材树种水曲柳为研究对象, 通过实验生态学方法, 重点研究了在不同的杂草竞争水平上水曲柳幼苗光合日动态、光补偿点及生物量积累等生理生态反应机制, 结果表明, 杂草竞争对水曲柳幼苗的生长有非常明显的影响, 尤为突出的是, 强烈的地下竞争抑制了水曲柳幼苗根系的生长, 地上及地下竞争的综合作用, 导致水曲柳幼苗光补偿点提高, 净光合速率明显降低, 生物量积累显著减少。
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| 关 键 词： | 水曲柳幼苗 杂草竞争 生理生态 地上生物量 地下生物量 |
| 文章编号： | 1671-8151(2005)02-0131-04 |
| 修稿时间： | 2004年10月11 |
Ecophysiological Response of Manchurian Ash (Fraxinus Mandshurica Rupr. ) Seedling to Competng Weeds |
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| LIANG Jian-ping et al..Ecophysiological Response of Manchurian Ash (Fraxinus Mandshurica Rupr. ) Seedling to Competng Weeds[J].Journal of Shanxi Agricultural University,2005,25(2):131-134. |
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| Authors: | LIANG Jian-ping |
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| Abstract: | Competition from weeds can be an important factor influencing ecophysiological process as well as productivity of tree seedling. Studies on the ecophysiological response of Manchurian ash (Fraxinus mandshuricaRupr.) seedlings were conducted at differentcompeted level, which included that the seedlings developing naturallywith whatever weeds which became established, weeding periodically(every two weeks) to remove partial or weeding periodically(every week) to remove most (about 75%) of weeds, and weeding to remove (once a week) any weeds and covering soilwith litters. The result showed that there were significant difference in diurnal courses of net photosynthetic rate, light compensation point and biomass of seedlings.Competition from underground were much more strong than that from above ground. Underground competition restrained seedling root growth, at the same times, competition from above ground influenced growing space, and thus increased light compensation point, reduced net photosynthetic rate, and finally reduced seedling biomass. |
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| Keywords: | Fraxinus mandshurica Seedling Weed competing Ecophysiology Underground biomass Above biomass |
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