文献类型：期刊文献

中文题名：温度与光照强度对红心杉幼苗光合特性的影响

英文题名：Effects of temperature and light on photosynthetic characteristics of Cunninghamia lanceolata seedlings

作者：付豪[1,2] 朱宁华[1] 段润梅[2] 阳胜男[3] 杨晓伟[1] 刘菲[1]

第一作者：付豪

机构：[1]中南林业科技大学,湖南长沙410004;[2]中国林业科学研究院热带林业实验中心,广西凭祥532600;[3]国家林业和草原局中南调查规划设计院,湖南长沙410014

年份：2020

卷号：40

期号：7

起止页码：73-78

中文期刊名：中南林业科技大学学报

外文期刊名：Journal of Central South University of Forestry & Technology

收录：CSTPCD;;北大核心:【北大核心2017】；CSCD:【CSCD2019_2020】；

基金：国家重点研发计划课题“不同产区杉木高值化装饰材培育技术研究”(2016YFD0600303)。

语种：中文

中文关键词：杉木;温度;光合;蒸腾;水分利用效率

外文关键词：Cunninghamia lanceolata;temperature;photosynthesis;transplration;water use efficiency

分类号：S791.27

摘要：【目的】通过对不同温度和光照强度下红心杉幼苗光合生理指标的测定和分析,了解夏季红心杉幼苗光合特性的变化规律,为促进杉木苗木生长和精准管理,提高育苗经济效益奠定理论依据。【方法】以陈山林场红心杉幼苗为材料,使用人工气候箱进行控温,采用LI-6400XT便携式光合仪于活体进行测定,研究不同温度和光照强度对光合生理指标的影响。【结果】红心杉幼苗的暗呼吸速率随着温度的升高而增加,呈线性关系;光补偿点随温度的升高而升高,并呈现显著的指数曲线变化规律;最大净光合速率呈二次曲线变化规律,在25℃时达最大值,35℃后快速下降。蒸腾速率随着温度的升高而增强,超过35℃时会迅速增强,总体呈现指数曲线变化规律;且温度与光照强度有协同作用,即高温、强光条件下,红心杉苗木蒸腾速率会增强。水分利用随温度的升高而降低;在相同温度下水分利用效率呈先升高后平稳最后下降的趋势,光照强度在1000~2500μmol·m-2s-1时利用率较高。【结论】杉木幼苗夏季低于35℃为适宜生长的温度,最适温度为25℃,适宜光照强度500~2000μmol·m-2s-1;在高温强光条件下会产生光、温抑制现象,且蒸腾速率快速增加,水分利用效率快速下降。因此,采取合理的育苗措施,如遮荫、喷雾等,控制苗床适宜的温度和光照强度,可以促进苗木的生长。
【Objective】Through the determination and analysis of photosynthetic physiological indexes of Cunninghamia lanceolata seedlings under different temperature and light intensity,the changes of photosynthetic characteristics of C.lanceolata seedlings were studied,which laid a theoretical basis for promoting the growth and precision management and improving the economic benefits.【Method】The C.lanceolata seedlings in Chenshan forest farm were used as experiment materials.The LI-6400XT portable photosynthetic apparatus was used to measure the photosynthesis.The effects of different temperature and light intensity on photosynthetic physiological indexes were studied.【Result】The dark respiration rate of C.lanceolata seedlings increased with the increase of temperature,which showed a linear relationship.The light compensation point increased with the increase of temperature and showed a significant exponential curve.The maximum net photosynthetic rate was two.The curve of the secondary curve changes to a maximum at 25℃and decreases rapidly after 35℃.The transpiration rate increases with the increase of temperature.When it exceeds 35℃,it will increase rapidly,and the overall exponential curve will change.The temperature and light intensity have synergistic effects.Under high temperature and strong light conditions,the transpiration rate of C.lanceolata seedlings will increase.The water use decreased with the increase of temperature;at the same temperature,the water use efficiency increased first and then finally decreased,and the light intensity was higher when the light intensity was 1000-2500μmol·m-2 s-1.【Conclusion】C.lanceolata seedlings were suitable for growth below 35℃,and the optimum temperature was 25℃.The suitable light intensity was 500-2000μmol·m-2s-1.Under high temperature and strong light conditions,light and temperature inhibition will occur,the transpiration rate will increase rapidly,the water use rate will decrease rapidly.Therefore,to control the appropriate temperature and light intensity of the seedbed,taking reasonable seedling measures can promote the growth of seedlings,such as shading,spraying.