Drupal 7 - 分类术语层次结构钩子函数

As you know there is an admin page for setting up hierarchy of terms by dragging it, which can be found on admin/structure/taxonomy/your_vocabulary. Underneath the table there are two buttons "Save" and "Reset to alphabetical". Now I need to interact with those sumbits by using some hook but I've no idea how to do it. I've already tried hook_taxonomy_term_presave() and hook_taxonomy_term_update(), but those are definitely not appropriate. Any ideas how to hook it?As you know there is an admin page for setting