文献类型：期刊文献

中文题名：不同淹水时间下中华蚊母树光响应特征及其模型比较

英文题名：Light response characteristics of photosynthesis and model comparison of Distylium chinense in different flooding durations

作者：刘泽彬[1,2] 程瑞梅[1,2] 肖文发[1,2] 郭泉水[1,2] 王娜[1,2]

第一作者：刘泽彬

机构：[1]中国林业科学研究院森林生态环境与保护研究所;[2]国家林业局森林生态环境重点实验室

年份：2015

卷号：26

期号：4

起止页码：1083-1090

中文期刊名：应用生态学报

外文期刊名：Chinese Journal of Applied Ecology

收录：CSTPCD;;Scopus;北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；PubMed;

基金："十二五"林业科技支撑计划项目(2011BAD38BO4)资助

语种：中文

中文关键词：淹水;中华蚊母树;净光合速率;光响应模型;光合参数

外文关键词：flooding; Distylium chinense ; net photosynthetic rate ; light response model ; photosyn-thetic parameter.

分类号：Q948.1

摘要：本文模拟库区秋冬季淹水环境,利用Li-6400 XT便携式光合仪测定了淹水条件下2年生中华蚊母树的光响应曲线,并采用直角双曲线模型、非直角双曲线模型和直角双曲线修正模型3种数学模型进行拟合分析,以探讨不同模型对水淹胁迫下中华蚊母树的适用性以及最佳光合参数对水淹胁迫的适应规律.结果表明:非直角双曲线模型对正常水分生长和短期水淹下(水淹15 d)中华蚊母树光响应过程的拟合优于其他两种模型,而直角双曲线修正模型对长期水淹下(水淹30、45和60 d)中华蚊母树光响应过程的拟合更具优势.直角双曲线修正模型对光补偿点(LCP)、最大净光合速率(Pn max)和光饱和点(LSP)的拟合效果最佳,非直角双曲线模型对暗呼吸速率(Rd)的拟合效果最佳.水淹前期(30 d),中华蚊母树表观量子效率(Φ)、Pn max和LSP逐渐降低,而LCP和Rd逐渐升高,但随着水淹时间的继续增加,中华蚊母树逐渐对水淹产生了适应性,各项光合生理指标逐渐趋于稳定,说明中华蚊母树具有一定适应水淹环境的能力.
The light responses of photosynthesis of two-year-old Distylium chinense seedlings subjec- ted to a simulated reservoir flooding environment in autumn and winter seasons were measured by using a Li-6400 XT portable photosynthesis system, and the light response curves were fitted and analyzed by three models of the rectangular hyperbola, non-rectangular hyperbola and modified rec- tangular hyperbola to investigate the applicability of different light response models for the D. chinense in different flooding durations and the adaption regulation of light response parameters to flooding stress. The results showed that the fitting effect of the non-rectangular hyperbola model for light response process of D. chinense under normal growth condition and under short-term flooding （ 15 days of flooding） was better than that of the other two models, while the fitting effect of the modified rectangular hyperbola model for light response process of D. chinense under longer-term flooding （30, 45 and 60 days of flooding） was better than that of the other two models. The modi- fied rectangular hyperbola model gave the best fitted results of light compensation point （ LCP ）, maximum net photosynthetic rate （P ） and light saturation point （LSP）, and the non-rectangu- lar hyperbola model gave the best fitted result of dark respiration rate （Rd ）. The apparent quantum yield （φ） , Pn max and LSP of D. chinense gradually decreased, and the LCP and Rd of D. chinense gradually increased in early flooding （30 days） , but D. chinense gradually produced adaptability for flooding as the flooding duration continued to increase, and various physiological indexes were grad- ually stabilized. Thus, this species has adaptability to some degree to the flooding environment.