QQ客服 官方微博 反馈留言

题名	策勒绿洲四种杨树的生态生理学特性的研究
作者	曾凡江
学位类别	硕士
答辩日期	1999
授予单位	中国科学院．中国科学院新疆生态与地理研究所．植物生态学．
导师	张鹤年，中国科学院新疆生态与地理研究所 李小明，中国科学院新疆生态与地理研究所 ，
关键词	植物生态学
中文摘要	本文通过四种杨种（新疆杨Populus alba L.var. Pyramidalis Bge.、箭杆杨Populus nigra L var. thevestina (Dode) Bean、胡杨Populus euphratica Oliv和灰杨Populus pruinosa. Schrank）的清晨带叶小枝水势月变化、叶片中叶绿素含量的月变化、光合作用和蒸腾作用的日变化、P-V曲线及持水力的测定分析，得出了如下初步结论：1 在测定的四种杨柳树中，新疆杨清晨水势变幅最大。这说明新疆杨对土壤对水分含量的变化最为敏感。新疆杨短枝叶的水势低于长枝叶，主要是由于短枝叶叶龄远大于长枝叶所致。其余三种杨树水势的月际变幅较大，说明了它们调节体内水份状况的能力较强。2 新疆杨和箭杆杨是人式引进的栽培种，而胡杨和灰杨为当地的乡土种。根据P-V曲线有关参数及持水力的测定值，人工栽培种新疆杨和箭植树杨的抗旱性能低于终年土种胡杨和灰杨，这是胡杨和灰杨长期适应当地生态环境条件的结果3 四种杨种的水分利用效率的排序是：胡杨>箭杆杨>灰杨>新疆杨。从这四种杨树的综合生态生理指标来看，胡杨和灰杨具有较高的水分利用效率和相对较好的适应干旱的机制，具备生长和生存上的优势。但因育苗困难，上前尚难于作为主要造林树种；箭植树杨对水分胁迫较为敏感，而新疆具有较强的体内水势调节能力，在塔南春季非常缺水的条件下，应以新疆杨作为首选造林树种。而在能充分满足灌溉的条件下，应首选箭杆杨，因为箭杆杆杨的水分利用效率高于新疆杨。Ecophysiological characteristics of Populus alba L. var. Pyramidalis Bge., Populus nigra L var. thevestina (Dode) Bean、Populus euphratica Oliv and Populus pruinosa Schrank has been studied in this paper. The monthly changes of predawn water potential of xylem and content of Chlorophyll, diurnal course of photosynthesis rate and transpiration rate, P-V curves and water-holding ability of four poplars were measured. Our results suggest: 1 The variant range vaule of predawn water potential of xylem of P. alba L. var. Pyramidalis was the greatest among four poplars., which showed that P. alba L. var. Pyramidalis is the most sensitive to the change of content of soil water among four poplars. The predawn water potential of short-shoot leaves of P. alba L. var. Pyramidalis is lower than that long-shoot leaves of P. alba L. var. Pyramidalis. This resulted from the leaf age of short-shoot leaves of P. alba L. var. Pyramidalis is older than leaf age of long-shoot leaves of P. alba L. var. Pyramidalis And the variant range values between mouthes of predawn water potential of xylem of P. nigra L var. thevestina, P. euphratica and P. pruinosa were smaller, which showed that they had relative strong ability to regulate water condition in their bodies. 2 P. alba L. var. Pyramidalis and P. nigra L var. thevestina were introduced poplar species. While P. euphratica and P. pruinosa are native species. According to the parameters of P-V curves and the measured vaules of water-holding ability, the ability of drought-resistance of P. alba L. var. Pyramidalis and P. nigra L var. thevestina(introduced species) is weaker than that of P. euphratica and p. pruinosa(native species). This was the result that P. euphratica and P. Pruinosa adjust the environment for a long time. 3 The order of water use efficiency (WUE) of four poplar is: P. euphratica> P. nigra L var. thevestina> P. pruinosa> P. alba L. var. Pyramidalis. From all the standards of ecophyology of four poplars, P. euphratica and P. pruinosa have the higher WUE and the better regime of drought-resistance. But it is difficulty to cultivate the seedlings of P. euphratica and P. pruinosa. For P. alba L. var. Pyramidalis has relative stronger ability to adjust water potential in its body, we should choose it as the important species to form the system of shelter-forest in the shortage of water in Spring in the North of Takalamakan Desert.. And we Should choose P. nigra L var. thevestina as the important species to form the system of shelter-forest under the circumstance of good water supply, because the WUE of P. nigra L var. thevestina is higher than that of P. alba L. var. Pyramidalis.
语种	中文
学科主题	林学
公开日期	2010-11-12
页码	共56页
内容类型	学位论文
源URL	[http://ir.xjlas.org/handle/365004/8246]
专题	新疆生态与地理研究所_中国科学院新疆生态与地理研究所(2010年以前数据)
推荐引用方式 GB/T 7714	曾凡江　. 策勒绿洲四种杨树的生态生理学特性的研究[D]. 中国科学院．中国科学院新疆生态与地理研究所．植物生态学．. 1999.

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。