[1]李铭怡,刘刚,许文年,等.新银合欢在不同土壤水分条件下的适生性研究[J].水土保持研究,2013,20(02):259-262,266.
　LI Ming-yi,LIU Gang,XU Wen-nian,et al.Research on Adaptability of Leucanea leucocephala under Different Soil Moisture Conditions[J].Research of Soil and Water Conservation,2013,20(02):259-262,266.
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新银合欢在不同土壤水分条件下的适生性研究

《水土保持研究》[ISSN:1005-3409/CN:61-1272/P] 卷: 20 期数: 2013年02期 页码: 259-262,266 栏目: 出版日期: 2013-04-28
Title:
Research on Adaptability of Leucanea leucocephala under Different Soil Moisture Conditions
作者:
李铭怡1, 刘刚1,2,3, 许文年1, 祝顺波1, 赵自超1, 吴彬1
1. 三峡大学 三峡库区地质灾害教育部重点实验室, 湖北 宜昌 443002;
2. 中国科学院 水利部 水土保持研究所 黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西 杨凌 712100;
3. 华中农业大学 资源与环境学院, 武汉 430070
Author(s):
LI Ming-yi1, LIU Gang1,2,3, XU Wen-nian1, ZHU Shun-bo1, ZHAO Zi-chao1, WU Bin1
1. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, China Three Gorges University, Yichang, Hubei 443002, China;
2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China;
3. College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
关键词:
三峡库区; 消落带; 水分梯度; 新银合欢; 光合生理特性
Keywords:
Three Gorges Reservoir Area; the hydro-fluctuation belt; water gradient; L. leucocephal; photosynthetic physiological characteristics
分类号:
Q945.11
摘要:
针对三峡库区消落带淹水变化引起的土壤水分梯度性特征，利用盆栽法模拟各种土壤水分条件，从形态学和生理生化的角度研究了当年实生新银合欢幼苗的不定根数、叶绿素含量及光合生理特性的变化特点。结果表明：新银合欢幼苗受水分变化的影响显著，在水淹条件下，幼苗的株高和不定根数等生长指标均受到明显抑制，净光合速率、蒸腾速率、气孔导度及胞间CO2浓度等光合指标也均显著下降，表现出不利的负向生理生态学响应。而在水分饱和及轻度干旱的水分条件下，幼苗各项指标综合表现最佳，表现出增益的正向响应。因此，新银合欢具有一定耐淹性但相对较弱，耐旱性较强，适宜于土壤水分饱和或偏干旱的环境生长，可考虑列为三峡库区消落带植被恢复建设树种。
Abstract:
The regular pattern of soil moisture condition of the hydro-fluctuation belt in Three Gorges Reservoir Area was imitated, and changes in the number of adventitious root, chlorophyll content and photosynthetic physiological characteristics of L. leucocephala seedlings were investigated. Results showed that different water treatments could significantly influence the photosynthetic physiological characteristics of L. leucocephala seedlings. The growth indices of seedlings, such as plant height and the number of adventitious root, were significantly inhibited and the net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) and intercellular CO2 concentration (Ci) also decreased significantly, showing a negative photosynthetic response to the flooding stress. But it was in contrast with a positive photosynthetic response to the water saturation and mild drought conditions, and the indices of seedlings comprehensively performed best. Therefore, L. leucocephala has relatively weak submergence-tolerant instinct but a strong draught tolerance, and is suitable for growing in the conditions of mild drought and water-saturated habitats, and L. leucocephala should be considered as the key plant in terms of vegetation restoration in the hydro-fluctuation belt of the Three Gorges Reservoir Area.

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备注/Memo

收稿日期:2012-10-01;改回日期:2012-11-01。
基金项目:国家自然科学基金（41201270）；湖北省教育厅自然科学研究项目（Q20111207，XD20100595）；黄土高原土壤侵蚀与旱地农业国家重点实验室基金（10501-1211）
作者简介:李铭怡(1988-),女,河北邯郸人,硕士研究生,主要从事边坡防护和生态修复技术研究。
通讯作者:刘刚(1982-),男,陕西西安人,博士,副教授,主要从事水土保持与生态环境研究。E-mail:gliu@foxmail.com

更新日期/Last Update: 1900-01-01