CFDO chief Yang Hung-chih informs us that Alishan's Japanese cedar have become so dense that they restrict each other's growth and prevent any increase in wood volume, and as a result transpiration and respiration effects are approaching zero. This hinders the absorption of greenhouse gases.
嘉義林管處長楊宏志指出，近年來阿里山的柳杉林已因過密而極度鬱閉，生長停頓、材積不再增加，因此蒸散作用和呼吸效果都趨近於零，對於溫室氣體的減量沒有幫助。