Teacher Li's rigorous and realistic academic attitude and diligent work attitude also deeply infected me and gave me great enlightenment, encouragement and encouragement. This spiritual infection will become a valuable asset in my life.

At the same time, I also want to thank my classmates and * * * for their support and encouragement in my writing process.

Finally, I would like to express my gratitude to all the teachers of Chenghuan College. I wish you good health and smooth work!

2. Thanks to * * teacher, * * teacher, * * teacher, * * teacher's education and training.

They carefully guide my study and research. Here, I want to bow deeply to all the teachers.

Thank my classmates * *, * *, * *, * * for their concern and help in my study and life in the past three years.

Finally, thank you for your understanding and support.

3. Thanks to Zhang Xiaomei, the teaching assistant, for his sincere teaching and Gong Rong, the head teacher, for his help!

Thank you, Mr. Li Chunhua, Mr. Tian Lu, Mr. Hua Crystal, Mr. An Tuanjie, Mr. Wang, and all the teachers in the Department of Folk Dance and the Department of Undergraduate, who have given me a lot of care and help during my four-year undergraduate study. I also thank the experts who participated in the thesis defense in advance. Their valuable opinions also played an important role in the further improvement of my thesis.

4. Thanks to my roommates Wen Yaxiang, Ke Chunting and Jia Ruixia in Fujian Normal University, who unconditionally let me live in their dormitory and gave me great convenience and help in the future. They help me do experiments when I am nervous and help me solve problems when I am depressed. Happy and warm dormitory life always brings me a good mood, which is productivity. I will never forget the little things we spent together over the past year or so.

I would like to thank my master tutor, Dr. Wu, a professor at the College of Forestry, Fujian Agriculture and Forestry University. Although I left him after graduation, I still seem to be under his guidance in my mind. When I encounter academic problems, my first thought is to look for him. He always answers me patiently and seriously with his profound knowledge. From the initial conception of my thesis to the implementation of the experiment to the analysis of the experimental data, every step has Mr. Wu's profound thoughts in it.

6. This research and thesis was completed under the kind care and careful guidance of my tutor. His serious scientific attitude, rigorous academic spirit and work style of Excellence deeply infected and inspired me. * Teachers not only give me careful guidance in my studies, but also give me meticulous care in my thoughts and life. Sincere thanks and high respect to the teachers. I also want to thank the students who spent the graduation thesis group happily together. It is because of your help and support that I can overcome one difficulty after another until I successfully finish this paper. When the paper is about to be completed, my heart can't be calm. How many respectable teachers, classmates and friends gave me wordless help from the beginning to the smooth completion of the thesis? Please understand my sincere thanks! Finally, I want to thank my parents who raised me with great pains. Thank you! Finally, once again, I would like to express my heartfelt thanks to the teachers and classmates who care about and help me!

7. The most important thing to thank is my tutor, Professor Gao! Thank you! Before the undergraduate course, I probably didn't pay much attention to my growth except studying. I am impulsive, arrogant and reckless. I always feel that I can succeed through my own efforts. When I became your student, you gave me greater guidance, and many life experiences influenced my growth imperceptibly. This is the best rule for me to leave my major behind! Now, I am going to graduate, and I must make myself work harder! You must also need more teaching!

8. First of all, I sincerely thank my thesis advisor, Mr. * *. She took time out of her busy teaching work to review and revise my paper. And all the teachers who have taught me, your rigorous and meticulous style has always been an example in my work and study; Their persuasive teaching and eclectic thinking have given me endless inspiration.

I thank my classmates and friends who have been with me for three years, and thank them for giving me useful suggestions and opinions. With their support, encouragement and help, I can spend three years of study life.

9. I thank my tutor Professor Liu Guohui. This paper was completed under the careful guidance of Liu Guohui, and it was patiently and meticulously guided by Liu Guohui from the topic selection, design scheme to the completion of the paper.

At the same time, I thank my dear classmates. We help each other, encourage each other and care about each other in our study. It is you who let me gain more things in my study and life.

10, first of all, thank the thesis tutor (thanks are for the tutor's contribution to this thesis and his teaching and influence on the author of the thesis).

Then, I would like to thank the teachers who helped me in the process of writing my thesis (the direction of thanks is: the teachers' help and guidance to the experimental part of this paper, and the solutions to some problems in this experiment, etc. )

Finally, in the process of writing your thesis, you should thank your brothers and sisters, classmates, brothers, sisters, friends and family, who help you with your experiments or search for information.

1 1. When the paper is finished, I look back on my study and life with infinite feelings. In these days, I have received the guidance, care, support and help from all teachers and classmates, and I want to express my heartfelt thanks to them. First of all, I want to thank all my acquaintances. They gave me help and encouragement in my study and life. * I left a perfect memory of my life. Finally, I want to thank my parents who have been silently supporting me behind me. Without their selfless support and care, I could not have achieved today's achievements. Finally, thank you to all those who have cared and helped me! And I would like to express my sincere thanks to all the teachers who participated in the paper review and defense.

12. Thanks to Jiao Juying, Teacher An Shaoshan for their care and help in the field investigation and daily life, and to Tian, Liu, Mu Xingmin, Shangguan, Jiao Juying, Xu Bingcheng, Teacher Chen Yunming for their guidance and valuable suggestions in the opening and completion of the paper.

I want to sincerely thank my tutor, Mr. Wen. From the topic selection, experiment, writing, revision and finalization of the paper, teachers have devoted a lot of effort and sweat. The teacher's rigorous academic attitude has a great influence on me, and his generous personality charm is my example to learn from. Unforgettable teachers' persuasive and earnest teaching in study, and their care and help in life made me gradually find the interest in learning, initially realized the fun of scientific research, broadened my horizons and ideas, and decided the future development direction. I am very grateful to the teacher for his help and concern during the exam, and gave me encouragement and guidance when I was confused.

14. At the end of this article, I sincerely thank all those who have given me help and care. Thank you for your help, let me make continuous progress and growth. Of course, I also want to thank those who gave me a different look and voted against it. You made it to this moment.

15, thanks to undergraduate students Tang Xiaowen, Su Jingwen, Zhu Lv and Lei Meng. Because we came together from the same school, we learned from each other, encouraged each other and became good partners in four years. There are also Wu Qingyao, Shi Ao, Zhang, et al. 20 1x and all undergraduate students. Thank you!