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中国樟科植物的地理分布 总被引：1，自引：0，他引：1
李锡文 《中国科学院研究生院学报》1979,17(3):24-40
From the study of the geographical distribution of Chinese lauraceous genera and
species, we may concludely obtained some results as follows:
1) Lauraceous family is a pantropical one in distribution, sometimes it may be
reached to the subtropical or temperate zone. There are 18 genera in China natively.
Among them 17 genera are of the tropical distribution-pattern. The tropical Asia dis-
tribution-pattern, i.e. Indo-malaysian distribution-pattern, is the nucleus of Chinese
lauraceous flora. Only 1 genus is of temperate distribution-pattern, i.e. the East Asia-
North America distribution-pattern. From the analysis of the primitive forms and the
concentration of species in these genera, we may regard that: a) All genera of the
tropical distribution-pattern were originated at Gondwana in the past period. South-
western and Southern China may be the birth-land of some genera of tropical distribu-
tion-pattern because it was the northern boundary of Gondwana in the past period.
b) The genus of temperate distribution-pattern may be originated in the montane
region of Western or South-western China.
2) Yunnan, Guangdong, Guangxi and Sichuan are the provinces having laura-
ceous species in abundance. But the provinces having lauraceous endemic species in
abundance are Yunnan, Guangdong, Taiwan,, Guangxi and Sichuan. In general Chinese
lauraceous plants are distributed mainly in south-western and southern parts of China.
The southeastern and southern parts of province Yunnan are of great abundance in
lauraceous species or endemic species. The species amount of lauraceous species in
these two parts of Yunnan is 67.3% of the total species amount of the lauraceous
flora in that province. It may be explained by the fact that a) where it is of existence
of primary forest, b)of great specific endemism in the rocky region and c) the
passway in migration of lauraceous plant from east to west or reverse.
3) The great similarity of lauraceous flora between Yunnan (especially its
western or north-western part) and Xizang (especially its southern or south-eastern
part), as well as between Guangdong and Guangxi, may be exhibited by the background
in perfect harmony of each own flora with environment in the past period. The en-
demism of lauraceous flora in Taiwan and Hainan is manifest from the standpoint of
island's isolation. But the latter is of a more manifest one, because it is situated at
the southern latitude and is more adaptive to the development of lauraceous plant.
4) The deciduous species of lauraceous plant which are the principal elements
in the flora of subtropical or temperate zone, are mainly of inland distribution-pattern.
Their geographical distribution are more concentrated at the montane region of
Western or South-western China. Where it may be the birth-land of the subtropical
or temperate lauraceous species, or even of the whole temperate flora.
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李锡文 《苏州教育学院学报》1997,(2)
当前,加强青少年德育教育,已被越来越多的人们所关注和重视,思想政治课的地位和作用已被越来越多的人们所认识,但目前仍存在着一些糊涂认识:一是政治课教学轻松论,认为思想政治课教材已基本定型,教材编得好,观点明脉络清,事例生动,通俗易懂,因此,教师只要读读讲讲,学生看看划划,课后念念背背就行了.二是畏难论:说什么现在有许多实际问题,从理论上很难说得清、道得明的,作为政治教师只能以“难得糊涂”来应付.如果我们政治教师也染有这种思想的话,那不仅不能搞好思想政治的教学,而且同政治教师的名称也极不相称的.据此,我们有必要从深化政治课教学改革的高度,来探讨一下合格政治教师应具备那些基本素质的问题,积数十年中学政治课教学之体会,我以为合格政治教师须具备以下一些基本素质 相似文献
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报道了樟科油丹属一新种，即黄连山油丹Alseodaphne huanglianshanensis H. W. Li & Y. M. Shui。它产自中国云南东南部绿春县黄连山海拔840-1300 m的热带阔叶次生林中，在体态上与同一分布区内的云南油丹A. yunnanensis Kosterm.十分相似，但叶为长圆形或倒披针状长圆形(5-13×(0.8-)1.2-2.8 cm)，明显较狭，两面几无蜂窝穴，总梗及果梗无毛，密被灰白色小瘤而不同。该新种也与油丹A. hainanensis Merr. 相似，但叶长圆形至倒披针状长圆形，坚纸质，先端锐尖或渐尖，两面几无蜂窝穴，侧脉每侧7-8条，果梗长5-7 mm，密被灰白色条形的小瘤而不同。 相似文献
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李锡文 《苏州教育学院学报》1998,(2)
由应试教育向素质教育转轨,不仅是一次教育思想、教育内容、教育方法的深刻变革,而且又是一次育人模式的深刻变革.近二年来,我校坚持以教学为中心,抓住教学管理这个突破口,大力推进素质教育,初步获得了可喜的成果.初中教育质量综合评估多次获市三等奖,普高省级会考合格率在同类完中中名列前茅,德、智、体、美、劳各项活动正常开展,在市各项竞赛中均得到了优良的成绩.成绩的取得,靠领导的支持、全校师生的努力,靠科学的管理,尤其在教学管理上,我们进行了认真的探索和实践,有力地推进了素质教育. 相似文献
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