干旱区生态环境知识资源中心(Arid): 不同营养条件下24种高寒草甸菊科植物种子重量对幼苗生长的影响

Arid

	不同营养条件下24种高寒草甸菊科植物种子重量对幼苗生长的影响
其他题名	Effects of seed weight on seedling growth under different nutrient conditions in twenty-four species of Compositae in an Alpine Meadow
	张世挺 1; 杜国祯 1; 陈家宽 2; 熊志远 1
来源期刊	生态学报
ISSN	1000-0933
出版年	2003
卷号	23 期号:9 页码:1737-1744
中文摘要	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生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种培养其质中持续减少。（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。
英文摘要	Effects of seed weight on seedling growth were investigated in 24 common species of Campsaitae 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 log seedling weight with a geometrical mean regression after all three different observation periods (p< 0.001), regardless of culture media, that is, heavier-seeded species had larger seedlings than lighter-seeded species. The relation between seed weight and seedling weight remained relatively constant in deionized water and decreased continuously in the other three culture media after 10d> 20d and 30d. This is probably because the seedlings in deionized water completely depend on the seed reserve, while seedlings in other three culture media can absorb external nutrients when the seed reserve is used up. There were significant negative correlations between log seed weight and log relative growth rate in all the culture media after lOd, 20d and 30d, but these correlations were only weak after lOd and 20d in deionized water. It seems that relative growth rate of any species was relatively constant, despite variations in nutrient supply, suggesting that relative growth rate may be a conservative character of aspecies. However, we could account neither for the weakness of the correlation between seed size and relative growth rate in deionized water after lOd and 20d, compared to 30d, nor why this was not apparent in the other three culture media. There were no significant correlations between log seed weight and log root shoot ratio, except for a significant positive correlation after lOd in deionized water. So the advantage of large seeds in alpine meadows does not lie in higher root allocation in early seedling growth, as found in arid zones in other studies.
中文关键词	种子重量 ; 幼苗重量 ; 相对生长率 ; 根冠比率 ; 高塞草甸
英文关键词	seed weight seedling weight relative growth rate root shoot ratio alpine meadow
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:1267516
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/204294
作者单位	1.兰州大学, 干旱农业生态国家重点实验室, 兰州, 甘肃 730000, 中国; 2.复旦大学生物多样性科学研究所, 上海 200433, 中国
推荐引用方式 GB/T 7714	张世挺,杜国祯,陈家宽,等. 不同营养条件下24种高寒草甸菊科植物种子重量对幼苗生长的影响[J]. 兰州大学,2003,23(9):1737-1744.
APA	张世挺,杜国祯,陈家宽,&熊志远.(2003).不同营养条件下24种高寒草甸菊科植物种子重量对幼苗生长的影响.生态学报,23(9),1737-1744.
MLA	张世挺,et al."不同营养条件下24种高寒草甸菊科植物种子重量对幼苗生长的影响".生态学报 23.9(2003):1737-1744.