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一、试材 1983年11月在四川省冕宁县,北纬28°44′,东经102°14′,海拔2225米处彝海,挖取出丽江铁杉Tsuga forrestii、黄杉Pseudotsuga Sinensis古木。丽江铁杉埋藏深度75厘米,黄杉大头埋藏50厘米,小头150厘米。该地区气候冬暖夏凉,垂直差异显著,日照率高,雨量集中在5—10月份。土壤肥厚,PH4.55,壤土。据研究:因彝海处于南北和东西交叉断层会集带,地质结构不稳定,古木为强烈断层陷落性地震使森林倒埋的结果。丽江铁杉肉眼观察未见表腐状况,炭化程度较小;黄杉炭化程度大于丽江铁杉,表腐3—5％,C~(14)测定,丽江铁杉距今6058±167年,黄杉距今3965±140年。
I. Specimens In November 1983, in Mianning County, Sichuan Province, the Tsuga forrestii and Pseudotsuga Sinensis were dug in Yihai at 28 ° 44’N, 102 ° 14’E and 2225m above sea level. Lijiang Hemlock buried depth of 75 cm, buried in the main cedar 50 cm, 150 cm small head. The climate in this area is warm in summer and cool in summer with significant vertical differences and high sunshine rates with rainfall concentrated in May-October. Soil hypertrophy, PH4.55, loamy soil. According to the study, because of the sea of Yihai at the intersection of the north-south and east-west faults, the geological structure is unstable and the ancient wood is the result of the forest being buried under the strong earthquake-induced collapse. Lijiang hemlock naked eye observation showed no surface rot condition, the degree of carbonization is small; the degree of cedar is greater than the hemlock hemlock, Table 3-5%, C ~ (14) Determination, Lijiang hemlock 6058 ± 167 years ago, yellow Fir today 3965 ± 140 years.