在计算森林覆盖率时,按规定需计入四旁林网树的占地面积,但其实际调查却比较困难。若直接量测冠幅,则工作量过大,如用树木株数折算面积,则因忽略了树种、胸径等因子引起的冠幅差异而影响精度。为探讨解决这一问题的途径,本文提出一个方法,即根据胸径 In calculating the forest coverage rate, according to the provisions to be included in the area next to the forest tree net, but the actual investigation is more difficult. If the direct measurement of the crown, the workload is too large, such as the number of trees converted area, then ignore the species, diameter and other factors caused by differences in the crown and affect the accuracy. In order to explore ways to solve this problem, this paper proposes a method based on DBH