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作 者 ：张世挺,杜国祯,陈家宽,熊志远

期 刊 ：生态学报 2003年 23卷 9期 页码：1737~1744

关键词：种子重量；幼苗重量；相对生长率；根冠比率；高寒草甸；

Keywords:seed weight, seedling weight, relative growth rate, root shoot ratio, alpine meadow,

摘 要 ：以青藏高原高寒草甸中常见的24种菊科植物为材料,在去离子水、河沙加蒸馏水、河沙加半强度霍格兰营养液和河沙加标准霍格兰营养液四种营养基质中培养幼苗,在10d、20d和30d三个幼苗生长期研究种子重量对幼苗生长的影响,结果表明:(1)在10d、20d和30d三个不同的幼苗生长期,在不同培养基质中种子重量与幼苗重量均呈显著的正相关,但R值在去离子水中变化不大,而在其它3种培养基质中持续减少。(2)种子重量与相对生长率负相关,这种负相关性在去离子水中10d和20d生长期表现较弱,在其它3种培养基质中同一生长期的幼苗相对生长率变化不明显。(3)除在10d去离子水中种子重量与幼苗根冠比率呈显著的正相关外,其余均没有显著的相关关系。

Abstract:Effects of seed weight on seedling growth were investigated in 24 common species of Compsoitae in an alpine meadow on the Tibet plateau. Seedlings were cultured in deionized water, washed sand with added distilled water, washed sand with added half strength Hoagland solution and washed sand with added standard Hoagland solution. Seedling growth was observed after 10 days, 20 days and 30 days. The results were as follows:(1) There was a highly significant positive correlation between log seed weight and l...

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