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化石采自云南腾冲上新统芒棒组。通过对比叶结构和角质层微细构造特征,从宏观和微观两个角度将化石鉴定为樟科植物樟(相似种)Cinnamomum cf.camphora(L.)Presl。化石叶片为卵状椭圆形,基部宽楔形,全缘,离基三出脉;上表皮无气孔器,表皮细胞为不规则四边形或多边形;下表皮细胞为不规则多边形,脉络上可见少量单细胞毛基,下表皮具短平列型气孔器,2个保卫细胞肾形,副卫细胞1-2个。同时对采自云南昆明,湖北武汉和浙江宁海三个地区的Cinnamomum camphora毛基密度做研究。发现毛基密度受太阳辐射和年降雨量的影响较大,与太阳辐射强度呈正相关,而与年降雨量呈负相关。与其现存最近亲缘种Cinnamomum camphora相比,化石的毛基密度较高,推测主要受到太阳辐射的影响,即腾冲地区上新世时太阳辐射强度比现在强。
Fossils from Yunnan Tengchong Umperor Manganese stick group. The fossils were identified as Cinnamomum cf. camphora (L.) Presl. From the macroscopic and microscopic perspectives by comparing the microstructural features of the leaf structure and the stratum corneum. Fossil leaves ovate oval, base wide wedge-shaped, entire, base three veins; upper epidermis without stomata, epidermal cells irregular tetragon or polygon; lower epidermal cells irregular polygons, a small number of single cells can be seen in the veins Hair base, the following epidermal short stomata stomatal apparatus, 2 guard cells kidney-shaped, vice guard cells 1-2. At the same time, the density of Cinnamomum camphora collected from Kunming in Yunnan Province, Wuhan in Hubei Province and Ninghai in Zhejiang Province was studied. It was found that the density of fur-based was strongly influenced by solar radiation and annual rainfall, positively correlated with solar radiation intensity, and negatively with annual rainfall. Compared with Cinnamomum camphora, its closest relative, the fossil has a higher density of fur, which is mainly due to the influence of solar radiation, that is, the intensity of solar radiation in the Tengchong area was higher than that at present.