温度升高和降水变化对高寒草甸两种典型物种荧光特性的影响

论文总字数：14171字

目 录

1 引言 1

2 材料和方法 2

2.1 实验介绍与实验材料 2

2.2 实验方法与实验测量 2

2.3 荧光参数的测量 2

3 数据的统计分析 3

3.1 温度升高和降水变化对荧光特性的影响 5

3.1.1 F_v'/ F_m' 5

3.1.2量子产量：Φ_PSII与Φ_CO2 5

3.1.3淬灭分析：qN与qP 6

3.1.4 ETR 8

4结论与讨论 8

4.1结论 8

4.2讨论 9

参考文献 9

致谢 11

温度升高和降水变化对高寒草甸两种典型物种荧光特性的影响

郝彦杰

Abstract:Under the background of global climate change, it is very important to understand the mechanism of temperature rise and precipitation changes on the fluorescence characteristics of species. In this experiment, we used the experiment of increasing temperature and changing precipitation. We carried out 6 treatments (no warming without changing precipitation, not increasing temperature water reduction by 50%, not increasing temperature plus water 50%, increasing temperature without changing precipitation, increasing temperature reducing water 50%, increasing temperature and reducing water by 50%), and setting up 6 repetitions for each treatment. Two species of Elymus dahuricus and Gentiana straminea were randomly selected as the subjects. The chlorophyll fluorescence characteristics of the leaves were measured for two years in the growing season, and then the multiple factor variance analysis was carried out. The results show that Elymus dahuricus has a linear positive correlation with precipitation at normal temperature. In the same precipitation situation, Fv'/Fm'has a linear negative correlation with the temperature. Under normal temperature treatment, the PSII value showed a linear negative correlation with precipitation. After increasing the temperature, there is a linear positive correlation between CO2 and precipitation. Under normal temperature, qN was higher than other precipitation treatments under normal rainfall conditions. There is a linear positive correlation between qP and precipitation under increasing temperature. At room temperature, ETR and precipitation showed a linear negative correlation trend. On the contrary, after warming treatment, ETR showed a linear positive correlation with precipitation change. At room temperature, Gentiana straminea showed a linear negative correlation with Fv'/Fm'. Under the condition of a certain amount of precipitation, there is a linear positive correlation between the temperature of PSII and the temperature. There is a positive linear correlation between the amount of PSII and the amount of precipitation. There is a linear negative correlation between the CO2 and precipitation. After the increase of temperature, the CO2 under normal precipitation is obviously higher than that of other precipitation. At room temperature, qN has a linear negative correlation with precipitation change. QP also has a linear negative correlation with the change of temperature. There was a positive linear correlation between ETR and precipitation at room temperature and temperature increase, and the linear positive correlation coefficient at room temperature was significantly higher than that after warming treatment.

Key words: Alpine meadow; warming; precipitation change; fluorescence characteristics

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