论文部分内容阅读
出散孔材的树种,如山杨、白桦、柳属、千金榆等的年轮很难区别;出环孔材的树种(橡树、白腊树及榆属)及针叶树种,如其生长量不大,年轮也不易区别。因此,给计算年龄、编制生长过程表、确定年轮宽度及秋材的百分率等工作带来一定的困难。我们在已修平的树平断面上涂抹甘油进行试验,结果很好。某些树种(如白桦)在涂抹甘油以后,
Diffusion of tree species, such as aspen, birch, Salix, Qian Jin Yu, such as the annual ring is difficult to distinguish; out of the ring hole tree species (oak, white and elm) and conifer species, such as its growth is not large , Rings are not easy to distinguish. Therefore, it will bring some difficulties to the calculation of age, preparation of the growth process table, determination of the width of the ring and the percentage of autumn wood. We have been flattened tree-level section of glycerin smear test, the result is very good. Some species (such as birch) after the application of glycerol,