The purposes of this research were to study and compare environmental knowledge, environmental ethics and environmental volunteers before and after integrated instructional activities of environmental education by using community - based learning and active learning, to compare environmental knowledge, environmental ethics and environmental volunteers of students with different gender and Grade Point Average (GPA). The sample used in the study were 89 the first year undergraduate students in Environmental Education program, Faculty of Environment and Resource Studies, Mahasarakham University, which was derived by purposive sampling in environmental studies course. The research tools were the integrated instructional activities of environmental education by using community - based learning and active learning, environmental knowledge test, environmental ethics test and environmental volunteers test. The statistics used for data analysis were frequency, percentage, mean, standard deviation and hypothesis testing using t-test, F-test (One–Way MANOVA, One–Way MANCOVA and Univariate Test). The results of the research showed that: 1) The students had average score of the environment knowledge, environmental ethics and environmental volunteers in the posttest higher than pretest statistical significance (p < .05). 2) There was no significant difference between average score of the environmental knowledge, environmental ethics and environmental volunteers of undergraduate students with different gender (p > .05). 3) There was statistically significant difference between average score of the environmental knowledge, environmental ethics and environmental volunteers of undergraduate students with different Grade Point Average (GPA) (p < .05).

Community-based learning is a strategy or model of learning management that integrates curricular content into the community using work based learning to encourage learners to learn from real-life situations in the community under the participation of teachers, learners and people in the community. The purposes of this research were to develop environmental education learning plans for enhancing rivers management in the Northeast of Thailand using community-based learning as effective and effective, to study and compare knowledge, attitude and environmental ethics for enhancing rivers management in the northeast before and after study and to compare knowledge, attitude and environmental ethics for enhancing rivers management in the Northeast of students with different gender. The sample used in the study were 50 the third year undergraduate students in Environmental Education program, Faculty of Environment and Resource Studies, Mahasarakham University, which was derived by purposive sampling. The research tools were the environmental education learning plans for enhancing rivers management in the Northeast of Thailand using community-based learning, knowledge test, attitude test and environmental ethics test. The statistics used for data analysis were frequency, percentage, mean, standard deviation and hypothesis testing using Paired t-test and One-Way ANOVA. The results of the research showed that: 1) The environmental education learning plans for enhancing rivers management in the Northeast of Thailand using community-based learning were the efficiency of 81.08/85.43, the efficiency index was a value of 0.7709, it showed that the students have increased knowledge and resulted in the students progressing from their studies accounted 77.09%; 2) The students had average score of the knowledge, attitude and environmental ethics in the posttest higher than the pretest statistical significance (p < .05); 3) There was statistically significant different of score of knowledge, attitude and environmental ethics of students with different gender (p < .05).

The purposes of this research were to develop learning plans for dam management in the Northeast of Thailand using case study-based learning being efficient and effective, to study and compare the knowledge, attitude, and environmental ethics concerning dam management in the Northeast of Thailand before and after learning, and different gender. The sample was 72 2nd-year students in Environmental Education program, Faculty of Environment and Resources Studies, Mahasarakham University, being selected by purposive sampling. Research tools were learning plans for dam management in the Northeast of Thailand, knowledge test, attitude test and an environmental ethics test. The statistics used in the research were frequency, percentage, mean, standard deviation, Paired t-test, and One-way ANOVA. The results of the research were found that: 1) The efficiency of learning plans was equal to 86.38/84.17, and the effectiveness index of learning plans was 0.7466. It showed that the students increased knowledge and resulted in the students progressing from their studies as 74.66 percent. 2) After the learning, the mean score of knowledge, environmental attitude, and environmental ethics of students were significantly higher than before the learning at the .05. 3) There was no different knowledge, environmental attitude, and environmental ethics between students with an different gender.

The purposes of this research were to study and compare knowledge about soil, water and forests conservation, environmental ethics and environmental volunteers using the environmental education training course on the concept of The King Rama Ⅸ of Thailand in soil, water and forest conservation before and after training of students having different genders and Grade Point Average (GPA). There were two sample used this research: one involved in the curriculum development consisting of 94 students in Environmental Education, Faculty of Environment and Resource Studies Mahasarakham University enrolled in the course Environmental Education Training Curriculum in the first semester of the academic year 2018, and the other composed of 67 first-year students in Environmental Studies who were enrolled in the course Environmental Education in the second semester of the academic year 2018. Both groups were selected through the purposive sampling. The research instruments were Environmental Education Training Course in soil, water and forest conservation on the concept of The King Rama Ⅸ of Thailand, knowledge test about soil, water and forest conservation, environmental ethics test and environmental volunteers test. The statistics used in the research were frequency, percentage, mean, standard deviation, including hypothesis testing using t-test, F-test One-Way MANOVA, One-Way MANCOVA, and Univariate Test. The results showed that: 1. The students’ average score of knowledge about soil, water and forest conservation on the concept of The King Rama Ⅸ of Thailand, environmental ethics, and environmental volunteers in the posttest was higher than the pretest statistical significance (p< .05). 2. There was significant different of average score of knowledge about soil, water and forest conservation on the concept of The King Rama Ⅸ science of Thailand, environmental ethics, and environmental volunteers between students with different gender statistical (p< .05). 3. There was significant different of average score of knowledge about soil, water and forest conservation on the concept of The King Rama Ⅸ of Thailand, environmental ethics, and environmental volunteers between students with different Grade Point Average (GPA) statistical (p< .05).

The purposes of this research were to study and compare knowledge about Khok Hin Lad community forest, environmental ethics, and environmental volunteers from learning activities of undergraduate students before and after activities, to study and compare knowledge about Khok Hin Lad community forest, environmental ethics, and environmental volunteers of undergraduate students with different gender and GPAs. The sample used in the research was 99 second-year undergraduate students in Environmental Education, Faculty of Environment and Resource Studies, Mahasarakham University, which are derived from purposive sampling. The research instruments were a manual of environmental learning activities in Khok Hin Lad community forest by using area-based learning, knowledge test about Khok Hin Lad Community Forest, Environmental ethics test, and environmental volunteers test. The statistics used in the research were frequency, percentage, mean, standard deviation. And hypothesis testing using t-test, F-test (One – Way MANOVA, One – Way MANCOVA, and Univariate Test). The study found that: 1) The student's knowledge average score of Khok Hin Lad community forest, environmental ethics, and environmental volunteers after learning activities were higher than before the learning activities' statistical significance (p< .05). 2) There was no different knowledge of Khok Hin Lad community forest, environmental ethics, and environmental volunteers between students of different gender (p> .05). 3) There was no different knowledge of Khok Hin Lad community forest, environmental ethics, and environmental volunteers between students with different GPAs (p>. 05).