| 黄河三角洲芦苇湿地土壤水分安全阈值 |
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| 引用本文： | 谢涛,杨志峰.黄河三角洲芦苇湿地土壤水分安全阈值[J].水科学进展,2009,20(5):683-688. |
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| 作者姓名： | 谢涛 杨志峰 |
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| 作者单位： | 北京师范大学环境学院水环境模拟国家重点试验室, 北京, 1000875 |
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| 基金项目： | 国家杰出青年科学基金资助项目，国家重点基础研究发展计划(973)资助项目 |
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| 摘 要： | 基于盆栽试验测定了多水分梯度下黄河三角洲芦苇湿地3种生态型芦苇(淡水沼泽芦苇、盐化草甸芦苇和咸水沼泽芦苇)快速生长期叶片的光合-光响应过程,比较各生态型芦苇适宜的土壤水分条件.结果表明:在相对含水率为95.6%时,淡水沼泽芦苇最大净光合速率比渍水条件显著升高(p<0.05),而盐化草甸芦苇和咸水沼泽芦苇这一差异并不显著(p<0.05).不同生态型芦苇净光合速率对土壤水分的变化存在不同的响应阈值.从适宜土壤水分的阈值看,淡水沼泽芦苇对水分胁迫的耐受能力高于盐化草甸芦苇和咸水沼泽芦苇,生境盐度差异可能是造成这一差异的重要原因.
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| 关 键 词： | 土壤水分 光合-光响应 阈值 芦苇湿地 黄河三角洲 |
| 收稿时间： | 2008-09-15 |
Safety threshold of soil water content for reed wetland in Yellow River Delta |
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| XIE Tao,YANG Zhi-feng.Safety threshold of soil water content for reed wetland in Yellow River Delta[J].Advances in Water Science,2009,20(5):683-688. |
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| Authors: | XIE Tao YANG Zhi-feng |
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| Institution: | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China |
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| Abstract: | According to the different soil water contents,the light response of photosynthesis of potted three ecotypes of reeds(fresh water swamp reeds,FWSR,salt meadow reeds,SMR,and salty water swamp reeds,SWAR) collected from the reed wetland in Yellow River Delta are measured,and their moderate soil water content ranges during the fast growing period are compared,so as to provide the evidence for the establishment of the ecological water requirement standards in reed wetland.The results show that the maximum net photosynthesis rate of FWSR,when the soil relative water content is 95.6%,is signifi-cantly higher than that in the waterlogged condition(p< 0.05).However,for SMR and SWAR this difference is not signifi-cant(p> 0.05).The net photosynthetic rates of the three ecotypes of reeds have different response thresholds to the alteration of soil water content.And the tolerance of FWSR to soil water stress is stronger than the other two ecotypes,which may be mainly due to the different soil salinities in their habitats. |
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