干旱区生态环境知识资源中心(Arid): 5种荒漠植物幼苗对模拟降水量变化的响应

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	5种荒漠植物幼苗对模拟降水量变化的响应
其他题名	Responses of Seedlings of Five Desert Species to Simulated Precipitation Change
	李秋艳; 赵文智
ISSN	1000-0240
出版年	2006
卷号	28 期号:3 页码:414-420
中文摘要	以5种荒漠植物红砂、泡泡刺、花棒、白刺和沙拐枣为研究对象，根据当地生长季节内60 d的平均降水量最大为91.2 mm，平均约为50.7 mm，最小约为35.9 mm等基本情况，人工控制了4种降水量处理水平（29、58、88、117 mm）来模拟幼苗生长对生长季节内降水量变化的响应。结果表明，每种植物都以自己的生长策略表现出独特的对降水量变化的响应格局。红砂幼苗的生长高度和高度生长率随着降水量的增加而显著减小，但降水量变化对其生物量和生物量分配及相对含水量影响不显著；降水量显著影响了泡泡刺和白刺幼苗的生长高度、高度生长率、生物量及其分配和相对含水量，但二者在生物量及生物量分配和相对含水量方面的趋势存在差异。泡泡刺幼苗的生长高度、高度绝对生长率、生物量及其分配等都随着降水量的增加而呈抛物线趋势；白刺幼苗以萎蔫老叶、发出新芽的方式来适应干旱环境。降水量显著影响了花棒幼苗的绝对高度生长率、生物量干重、生物量分配和相对含水量，但对生长高度和相对高度生长率影响不明显；沙拐枣幼苗的相对高度生长率和生物量干重对降水量的响应不敏感，但从其幼苗的生长高度和绝对高度生长率来看，沙拐枣幼苗的存活需要较多的水分。花棒和沙拐枣在不同降水量处理下对地上、地下生物量的分配方式相反，但降水量偏少限制了二者的生长。红砂和白刺幼苗更适合于在适宜在降水量为29 mm的环境中生存，泡泡刺幼苗阶段适宜在降水量为58～88 mm的环境中生长，而花棒和沙拐枣在幼苗阶段的生长更偏向于降水量多于88 mm的条件。
英文摘要	The responses of seedlings to global precipitation change by artificially controlling water supply at four levels are investigated of five desert species, Reaumuria soongorica , Nitraria sphaerocarpa , Hedysarum scoparium , Nitraria tangutorum and Calligonum mongolicum, which occur frequently in the arid regions of Northwest China. It is revealed that every species exhibits its individual pattern of response to precipitation change that links to the growth strategy. The growth height and height growth rates of Reaumuria soongorica significantly decrease with the increasing water supply, however, its biomass, biomass allocation and relative water content are insignificantly influ- enced by water supply. Growth height, height growth rates, biomass, biomass allocation and relative water content are significantly influenced by water supply of both Nitraria sphaerocarpa and Nitraria tangutorum. Growth height, height growth rates, biomass and biomass allocation of Nitraria sphaerocarpa increase with the increasing water supply; however, they decrease constantly when they reach the highest points. Nitraria tangutorum has a way of new leaves growing and old leaves falling off to adapt to drought conditions. Absolute height growth rate, hiomass, hiomass allocation and relative water content of Hedysarum scoparium are significantly influenced by water supply, except for growth height and relative height growth rate. Although the relative height growth rate and biomass of it is not sensitive to water supply, Calligonum mongolicum surviving needs more water supplies, as viewed from growth height and absolute height growth rate. In biomass allocation with the increasing water supply, Hedysarum scoparium and Calligonum mongolicure have opposite trend, however, their growth are restricted by drought conditions. Reaumuria soongorica and Nitraria tangutorum acclimate the drought environments with rainfall about 29 mm. Hedysarum scoparium and Calligonum mongolicure prefer more water supply conditions, e. g. , more than 88 mm of precipitation, and Nitraria sphaerocarpa prefers the climate neither very dry nor very wet, with a precipitation range of 58～88 mm.
中文关键词	模拟降水量 ; 幼苗生长 ; 生长策略 ; 荒漠植物
英文关键词	simulated precipitation seedling growth growth strategy desert species
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOSCIENCES MULTIDISCIPLINARY
WOS研究方向	Geology
CSCD记录号	CSCD:2449084
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/219439
作者单位	中国科学院寒区旱区环境与工程研究所流域水文及应用生态实验室中国生态系统研究网络临泽内陆河流域综合研究站, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	李秋艳,赵文智. 5种荒漠植物幼苗对模拟降水量变化的响应[J]. 中国科学院西北生态环境资源研究院,2006,28(3):414-420.
APA	李秋艳,&赵文智.(2006).5种荒漠植物幼苗对模拟降水量变化的响应.,28(3),414-420.
MLA	李秋艳,et al."5种荒漠植物幼苗对模拟降水量变化的响应".28.3(2006):414-420.