论文部分内容阅读
1974、1975和1978年,我们在云南省昆明市安宁县笔架山、板栗篝及云南林学院校园附近山地,对云南松的结实特性进行了初步的观察。调查的林分均为天然次生林,纯林,林龄一般不超过30年,郁闭度0.7左右,同时还调查了少量散生树木。由于附近人为活动比较频繁,选定标准地时曾特别注意避开遭受人为破坏的地点。调查地区海拔在1900—2100米之间,年平均温度14.7℃,年降水量941.0毫米,土壤多为红壤。一、开花结实的物候形态特点云南松小孢子叶球约在3月中下旬突破芽鞘显现(平均气温13.3—14.1℃),初期为深黄色,体
In 1974, 1975 and 1978, we conducted a preliminary observation of the robustness of Pinus yunnanensis in the mountainous terrain near Beijia Mountain, Chekiang Camp and Yunnan Forestry College in Anning County, Kunming, Yunnan Province. The survey stands are natural secondary forest, pure forest, usually not more than 30 years old, canopy density of about 0.7, but also investigated a small amount of scattered trees. Due to the frequent human activities in the vicinity, special attention was given to avoiding sites that were vandalized at the time of selection. Survey area at an altitude of 1900-2100 meters, the annual average temperature of 14.7 ℃, the annual rainfall of 941.0 mm, mostly red soil. First, the phenological characteristics of flowering and fruiting Pinus yunnanensis Microsporophyll leaves around the middle and late March break bud sheath manifestations (average temperature 13.3-14.1 ℃), the initial dark yellow, body