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引用本文:刘泽彬,程瑞梅,肖文发,郭泉水,王彦辉,王娜.中华蚊母树(Distylium chinense)幼苗对秋、冬季淹水的生长及生理响应.湖泊科学,2016,28(2):405-413. DOI:10.18307/2016.0221
LIU Zebin,CHENG Ruimei,XIAO Wenfa,GUO Quanshui,WANG Yanhui,WANG Na.Growth and physiological responses of Distylium chinense seedlings to autumn and winter flooding. J. Lake Sci.2016,28(2):405-413. DOI:10.18307/2016.0221
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中华蚊母树(Distylium chinense)幼苗对秋、冬季淹水的生长及生理响应
刘泽彬1,2, 程瑞梅1,2, 肖文发1,2, 郭泉水1, 王彦辉1, 王娜1,2
1.中国林业科学研究院森林生态环境与保护研究所, 国家林业局森林生态环境重点实验室, 北京 100091;2.南京林业大学南方现代林业协同创新中心, 南京 210037
摘要:
为阐明三峡库区岸生植物中华蚊母树(Distylium chinense)幼苗对水淹的耐淹机理,通过设置对照组(CK)、半淹组(PF)、全淹组(CF)3个水淹处理,模拟库区消落带秋、冬季淹水情况,研究中华蚊母树幼苗在不同水淹时间和深度下的生长及生理生化特性. 结果表明,淹水显著影响中华蚊母树幼苗的生物量,水淹150 d后,PF组植株和CF组植株根、茎、叶生物量均呈显著降低趋势,同时受水淹影响,植株根冠比也显著降低;中华蚊母树幼苗在水淹前90 d 2组水淹处理植株叶片丙二醛(MDA)含量均与CK组植株差异不显著,水淹120 d后,中华蚊母树幼苗叶片MDA含量显著增加,且随着水淹深度的增加而逐渐升高;可溶性蛋白在各水淹处理中的变化有所差异,水淹前60 d,淹水并没有影响CF组植株可溶性蛋白含量,但从水淹90 d开始,CF组植株可溶性蛋白含量有所上升,而PF组植株可溶性蛋白含量在整个淹水期间均与CK组植株差异不显著;2组水淹处理植株脯氨酸在水淹前期均显著上升,但自水淹90 d后逐渐下降至CK组水平;与MDA对水淹的响应一致,水淹前期PF组和CF组植株抗氧化酶活性(超氧化物歧化酶、过氧化氢酶和抗坏血酸过氧化物酶)均没有出现明显影响,但水淹后期2组水淹处理植株抗氧化酶活性均显著升高;可溶性糖含量在不同水淹处理下有所差异,PF组植株叶片可溶性糖含量在整个淹水期间均与CK组植株差异不显著;而CF组植株叶片可溶性糖含量随着水淹时间的延长逐渐降低. 研究证明,中华蚊母树幼苗生长及生理特性对秋、冬季水淹环境具有一定的调节能力,是中华蚊母树幼苗能够在库区消落带存活生长的一个重要原因.
关键词:  淹水  消落带  中华蚊母树幼苗  生物量  生理生化  三峡库区
DOI:10.18307/2016.0221
分类号:
基金项目:"十三五"林业科技支撑计划课题(2015BAD07B04)和"十二五"林业科技支撑计划课题(2011BAD38BO4)联合资助.
Growth and physiological responses of Distylium chinense seedlings to autumn and winter flooding
LIU Zebin1,2, CHENG Ruimei1,2, XIAO Wenfa1,2, GUO Quanshui1, WANG Yanhui1, WANG Na1,2
1.Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry Key Laboratory of Forest Ecology and Environment, State Forestry Administration, Beijing 100091, P. R. China;2.Co-innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, P. R. China
Abstract:
In order to reveal the tolerance mechanism of Distylium chinense seedlings to flooding, three treatments were installed, i.e., control (CK), partial flooding (PF) and complete flooding (CF) to simulate the reservoir flooding environments in autumn and winter seasons to study the growth and physiological adaptation mechanisms under different flooding duration and different flooding depth. Flooding significantly affected the biomass of D. chinense seedlings. After treated for 150 days, the biomass of leaf, shoot and root in PF and CF decreased significantly, and the root-shoot ratio also experienced a significant reduction. The content of MDA in PF and CF treatments were not significantly different at the beginning of 90-day flooding, but the content of MDA increased significantly after 120 days of flooding and gradually increased with the rise of flooding depth. The changes of soluble protein in PF and CF were different, while no difference in soluble protein content between CF and CK at the beginning of 60-day flooding. The content of soluble protein in CF increased after 90 days of flooding, while that in PF was not significantly different compared with CK. The content of proline in PF and CF increased at the early of flooding, and dropped to CK level after 90 days of flooding. Similar to MDA, there were no significant changes in the antioxidant enzyme activity (SOD, CAT and APX) at the early of flooding, but flooding caused the antioxidant enzyme activity to increase significantly at the end of flooding. The changes of soluble sugars under each treatment were different. There was no difference in soluble sugars in leaf between PF and CK, while soluble sugars in leaf in CF increased with flooding time gradually decreased. The above results suggest that D. chinense seedlings have high growth and physiological adjustment capability in the flooding environment. This adjustment capability is one of the important reasons for the survival and growth of D. chinense seedlings in hydro-fluctuation belt of the Three Gorges Reservoir region.
Key words:  Flooding  hydro-fluctuation belt  Distylium chinense seedlings  biomass  physiology and biochemistry  Three Gorges Reservoir
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