国家自然科学基金项目(41271167
41201398
41171122)
教育部人文社会科学研究青年基金项目(12YJC-ZH073)
湖南省自然科学基金项目(11JJ6028)
湖南省人文地理学重点建设学科项目
衡阳师范学院青年骨干教师项目(RGGJSPYF0311)
湖南省自然科学创新研究群体项目(12JJ7003)[Foundation:National Natu-ral Science Foundation of China, No.41271167
No.41201398
No.41171122
Humanity and Social Research Project of Education Ministry to Young Scholars, No,12YJCZH073
Natural Science Foundation of Hunan Prov- ince, No.llJJ6028
Key Constructive Disciplines Projects of Human Geography in Hunan Province
Key Young Teacher of Hengyang Normal University, No.RGGJSPYF0311
Natural Science Foundation of Creative Group of Hunan Province, No. 12JJ7003]