落羽杉与池杉幼苗对不同土壤水分含量的生理响应

doi:10.11707/j.1001-7488.20100404

林业科学 ›› 2010, Vol. 46 ›› Issue (4): 22-30.doi: 10.11707/j.1001-7488.20100404

落羽杉与池杉幼苗对不同土壤水分含量的生理响应

李昌晓^1,3 叶兵² 耿养会³ Schneider Rebcca⁴

1. 西南大学生命科学院三峡库区生态环境教育部重点实验室重庆 400715； 2. 中国林业科学研究院科技信息研究所北京 100091； 3. 三峡库区森林生态保护与恢复重庆市市级重点实验室重庆 400036；4. 美国康乃尔大学农学与生命科学院自然资源系纽约州依萨卡市 14853

收稿日期:2009-10-21 修回日期:1900-01-01 出版日期:2010-04-25 发布日期:2010-04-25
通讯作者: 叶兵

Physiological Responses of Taxodium distichum (Baldcypress) and Taxodium ascendens (Pondcypress) Seedlings to Different Soil Water Regimes

Li Changxiao^1,3,Ye Bing²,Geng Yanghui³, Schneider Rebcca⁴

1. Key Laboratory for the Eco-Environment of the Three Gorges Reservoir Region of the Ministry of Education, College of Life Sciences, Southwest University Chongqing 400715； 2. Research Institute of Forestry Policy and Information, CAF Beijing 100091；3. Chongqing Key Laboratory for the Protection and Restoration of Forest Ecology of the Three Gorges Reservoir Region Chongqing 400036； 4.Department of Natural Resources, College of Agriculture and Life Sciences, Cornell University NY 14853

Received:2009-10-21 Revised:1900-01-01 Online:2010-04-25 Published:2010-04-25

摘要/Abstract

摘要：

研究落羽杉与池杉幼苗对常规水分处理©、轻度干旱(MD)、土壤潮湿(WS)以及水淹(FL)等不同水分处理的生理响应特性。与对照组相比,2树种幼苗在轻度干旱与水淹处理条件下叶片自由水含量显著提高,而束缚水含量则显著降低。2树种幼苗在潮湿处理组的叶片自由水与束缚水含量均未出现低于对照组的现象。轻度干旱、土壤潮湿与水淹处理均未导致2树种叶片电导率与丙二醛含量的显著变化(池杉水淹条件下叶片的丙二醛含量变化例外)。水淹处理能显著增加2树种幼苗叶片的可溶性糖含量,同时降低其脯氨酸含量。轻度干旱与潮湿处理能显著增加落羽杉而降低池杉幼苗叶片的脯氨酸含量。尽管同属的2树种幼苗表现出较多相似的响应特征,二者对不同水分逆境胁迫条件的响应仍然存在许多差异。

关键词: 土壤水分变化, 生理响应, 叶片水分含量, 落羽杉, 池杉, 幼苗

Abstract:

Physiological responses of baldcypress (Taxodium distichum) and pondcypress (Taxodium ascendens) seedlings to a wide range of hydrological regimes were studied. These regimes included control ©, mild drought (MD), wet soil (WS) and flooding (FL). Both species showed a significant increase in leaf free water content and lower leaf bound water content under MD and FL conditions as compared to the control ©. The free or bound water content in WS was never lower than that in C in either species. No significant changes were demonstrated in electrolyte leakage and concentration of malondialdehyde (MDA) in baldcypress or pondcypress seedlings under MD, WS and FL, except the MDA concentration in FL in pondcypress. Flooding significantly increased soluble sugar concentration and decreased proline content in both species. Moreover, proline content was enhanced in baldcypress seedlings, but reduced in pondcypress seedlings in MD and WS. Thus, despite a number of similar responses, the seedlings of these two congeneric species exhibited some different traits in responses to water stresses.

Key words: soil water change, physiological response, leaf water content, Taxodium distichum, T. ascendens, seedlings

李昌晓;叶兵耿养会 Schneider Rebcca. 落羽杉与池杉幼苗对不同土壤水分含量的生理响应[J]. 林业科学, 2010, 46(4): 22-30.

Li Changxiao;Ye Bing;Geng Yanghui;Schneider Rebcca. Physiological Responses of Taxodium distichum (Baldcypress) and Taxodium ascendens (Pondcypress) Seedlings to Different Soil Water Regimes[J]. Scientia Silvae Sinicae, 2010, 46(4): 22-30.

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落羽杉与池杉幼苗对不同土壤水分含量的生理响应

Physiological Responses of Taxodium distichum (Baldcypress) and Taxodium ascendens (Pondcypress) Seedlings to Different Soil Water Regimes

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