论文部分内容阅读
《模拟样地抽样法试验初报》(以下简称《模》文)于1975年发表后,引起了我们极大的兴趣。为了探讨这种方法在四川林区的适用情况,我省一、二大队于1976年在雅江、义敦、色达等林区,对模拟样地、象限模拟样地、定株样圆、常规样地等多种方法进行了对比试验。试验地区总面积为286.3公顷,最后用全林检尺做了检验。试验表明,模拟样地精度是可靠的,可以在森林调查中推广。但是,我们也觉得有些问题尚需进一步研究和讨论,使它更加完善。本文仅就模拟样地在四川林区的应用问题,提出一些看法,进行讨论。一、关于模拟样地面积计算公式问题模拟样地是一种只有理论边界而无实际边界、各样地林木株数相等而面积不等的实测样地。样地面积是通过量测中心点0号树距其最近几株树的平均株距,并将其模拟成正多边形计算的。
After the publication of the Preliminary Report on the Simulated Sample Sampling (hereinafter referred to as “Die”) in 1975, it aroused great interest. In order to explore the application of this method in the forest area of Sichuan Province, the first and second brigades of our province in the forest areas of Yajiang, Yidun and Seda in 1976 simulated and sampled quadrats, quadrats, Plots and other methods for a comparative test. The total area of the experimental area is 286.3 hectares, and finally the inspection is done with a full scale. Experiments show that the accuracy of simulated plots is reliable and can be promoted in forest surveys. However, we also think some issues need further study and discussion to make it more perfect. This article only on the application of simulated plots in the forest area in Sichuan, put forward some views for discussion. First, on the issue of the calculation of analog plots area Sample plots is a kind of theoretical boundaries without an actual border, all kinds of equal number of trees and the measured area of varying sizes. The sample area is calculated by measuring the average plant spacing of tree 0 from its nearest tree and simulating it as a regular polygon.