Apart from lack of reliable data on forest degradation and the existence of various definitions for it, there are a number of issues such as land degradation which act synergistically with forest degradation.
20. 除了缺乏关于森林退化的可靠资料和存在森林退化的各种定义之外，有一些问题(如土地退化问题)都会对森林退化造成影响。