| 春季小降雨事件对科尔沁沙地尖头叶藜萌发的影响 |
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| 引用本文： | 马赟花,张铜会,刘新平,毛伟,岳祥飞.春季小降雨事件对科尔沁沙地尖头叶藜萌发的影响[J].生态学报,2015,35(12):4063-4070. |
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| 作者姓名： | 马赟花 张铜会 刘新平 毛伟 岳祥飞 |
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| 作者单位： | 中国科学院大学寒区与旱区环境与工程研究所, 兰州 730000,中国科学院大学寒区与旱区环境与工程研究所, 兰州 730000,中国科学院大学寒区与旱区环境与工程研究所, 兰州 730000,中国科学院大学寒区与旱区环境与工程研究所, 兰州 730000,中国科学院大学寒区与旱区环境与工程研究所, 兰州 730000 |
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| 基金项目： | 973项目课题(2009CB421303); 国家科技支撑项目课题(2011BAC07B02); 中国科学院战略性先导科技专项子专题(XDA05050201-04-01); 国家自然基金项目(41371053, 31300352) |
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| 摘 要： | 通过人工模拟降雨试验研究了科尔沁沙地优势草本植物尖头叶藜萌发和幼苗建成对春季小降雨事件(2、4、8 mm和自然降雨)的响应。结果表明:不同降雨处理对尖头叶藜的萌发和幼苗建成有显著影响(P0.05)。8mm降水量是促使尖头叶藜萌发的最小降雨阈量。不同降雨量处理下尖头叶藜萌发数量大小顺序为:8mm处理对照4 mm处理2mm处理;而高度和冠幅依次是2 mm处理(2.23 cm和7.15 cm2.)对照(2.03 cm和6.21 cm2)4mm处理(1.86 cm和5.01 cm2)8mm处理(1.48cm和4.72 cm2);降雨量为8mm的地上生物量最多(45.26 g/m2),对照为35.49g/m2、4mm处理为26.54g/m2、2mm处理为15.26g/m2。尖头叶藜幼苗的水分利用效率与每次降水量呈显著地正相关关系,随着每次降雨量的增大地上生物量逐渐增大。本试验中各处理的总降雨量一致,但地上生物量不同且差异显著。每次降雨量×降雨次数的分布状况影响了尖头叶藜幼苗的地上生物量。科尔沁沙地尖头叶藜萌发及其幼苗建成在密度、形态和水分利用效率和地上生产力上对不同模式的小降雨做出了积极的响应。
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| 关 键 词： | 小降水事件 降雨强度 萌发 幼苗建成 生态特征 科尔沁沙地 |
| 收稿时间： | 2013/10/31 0:00:00 |
| 修稿时间： | 2015/4/3 0:00:00 |
Effects of small rainfall events in spring on germination of Chenopodium acuminatum in Horqin Sandy Land |
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| MA Yunhu,ZHANG Tonghui,LIU Xinping,MAO Wei and YUE Xiangfei.Effects of small rainfall events in spring on germination of Chenopodium acuminatum in Horqin Sandy Land[J].Acta Ecologica Sinica,2015,35(12):4063-4070. |
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| Authors: | MA Yunhu ZHANG Tonghui LIU Xinping MAO Wei and YUE Xiangfei |
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| Institution: | Cold and Arid Regions of Environmental and Engineering Research Institute, University of Chinese Academy of Sciences, Lanzhou 730000, China,Cold and Arid Regions of Environmental and Engineering Research Institute, University of Chinese Academy of Sciences, Lanzhou 730000, China,Cold and Arid Regions of Environmental and Engineering Research Institute, University of Chinese Academy of Sciences, Lanzhou 730000, China,Cold and Arid Regions of Environmental and Engineering Research Institute, University of Chinese Academy of Sciences, Lanzhou 730000, China and Cold and Arid Regions of Environmental and Engineering Research Institute, University of Chinese Academy of Sciences, Lanzhou 730000, China |
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| Abstract: | This paper assessed the effects of small artificial rainfall events (2 mm, 4 mm, 8 mm and natural rainfall as control) on the germination and seedling growth of Chenopodium acuminatum in Horqin Sand Land. Analysis showed that artificial rainfall treatment had significant impacts on the germination and seedling growth of Chenopodium acuminatum (P < 0.05).The rainfall threshold in Horqin Sand Land for the germination of Chenopodium acuminatum is 8mm. The plant number of seedlings in 8 mm rainfall treatment,natural rainfall (CK), 4 mm and 2 mm is in a decreasing order, and the plant height and canopy of seedling in different rainfall treatments were in the order: 2 mm(2.23 cm and 7.15 cm2) > CK(2.03 cm and 6.21 cm2) > 4 mm(1.86 cm and 5.01 cm2) > 8 mm(1.48 cm and 4.72 cm2). Aboveground biomass was in the order of 8 mm (45.26 g/m2) > CK (35.49 g/m2) > 4 mm (26.54 g/m2), > 2 mm (15.26 g/m2). Water use efficiency of Chenopodium acuminatum seedling was positively correlated to rainfall of each time and the aboveground biomass was increased with rainfall amount. Total rainfall at last in the experiment was the same, but the aboveground biomass was significantly different. The rainfall amount×rainfall times was a determinant factor of aboveground productivity of Chenopodium acuminatum seedlings. The density and water use efficiency, germination and seedling gowth of Chenopodium acuminatum all positively responsed to small rainfall events in Horqin Sand Land. |
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| Keywords: | small rainfall events rain intensity germination seedling establishment ecological characteristics Horqin Sandy Land |
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