【摘要】：對(duì)在甘肅窯街中侏羅統(tǒng)窯街組發(fā)現(xiàn)的真蕨類化石進(jìn)行系統(tǒng)描述,通過與相似種的蕨葉、葉脈、羽片、小羽片分裂的程度及裂片形狀等特征的對(duì)比,明確該化石植物為Coniopteris spectabilis Brick。通過實(shí)驗(yàn)分析揭示出C.spectabilis的原位孢子基本特征:極面觀為三角形、圓三角形,頂角鈍圓,三邊線平直或微凸;赤道面觀為半圓形、橢圓形,近極微突出;極面觀直徑38~54μm,平均46μm;三射線平直或微彎,部分隆起為脊線狀。同時(shí),將其與窯街地層中相似分散孢子的形態(tài)、直徑、三射線等特征對(duì)比后認(rèn)為,Deltoidospora irregularis是C.spectabilis的孢子,后者為前者的母體植物。基于中國已發(fā)現(xiàn)的44種錐葉蕨的時(shí)空分布記錄發(fā)現(xiàn),從早侏羅世到早白堊世,中國錐葉蕨屬分布總體呈向北推移的趨勢(shì),分布范圍逐漸縮小,也反映出適宜錐葉蕨生長(zhǎng)的溫帶氣候區(qū)的總體分布也相應(yīng)地有向北推移的趨勢(shì)。
[Abstract]:A systematic description of the fern fossils found in the Middle Jurassic Yaojie formation in Yaojie, Gansu Province was carried out. By comparing the characteristics of the fern leaves, veins, pinnae, pinnae and small pinnae of similar species, and the shape of the segments, the fossil plant was identified as Coniopteris spectabilis Brick.. The basic characteristics of in situ spores of C.spectabilis were revealed by experimental analysis: the polar view is triangle, circular triangle, the apex angle is obtuse, the trilateral line is straight or slightly convex, the equatorial view is semicircular, ellipsoid, nearly micro-protruding; The diameter of the polar surface is 38 ~ 54 渭 m (average 46 渭 m), and the three-ray is straight or slightly curved, and some of the protuberances are ridge-like. At the same time, it is considered that, Deltoidospora irregularis is the spores of C.spectabilis, and the latter is the parent plant of the former, after comparing the morphology, diameter and three-ray characteristics of dispersed spores similar to those in Yaojie Strata. Based on the temporal and spatial distribution records of 44 species of Dryopteris species found in China, it was found that from early Jurassic to early Cretaceous, the distribution of the genus Dryopteris from early Jurassic to early Cretaceous generally showed a northward trend, and the distribution range gradually decreased. It also reflects that the overall distribution of temperate climates suitable for the growth of Dryopteris conifera has a tendency to move northward accordingly.
【作者單位】： 西北師范大學(xué)地理與環(huán)境科學(xué)學(xué)院;
【基金】：國家自然基金資助項(xiàng)目(41262001)
【分類號(hào)】：Q914

【相似文獻(xiàn)】

相關(guān)期刊論文 前9條

1 馬清溫,王宇飛,,李承森;北京西山侏羅紀(jì)大同錐葉蕨的研究[J];植物分類學(xué)報(bào);1998年02期

2 王永棟,吳秀元;新疆塔北二疊紀(jì)的柯坪稀囊蕨及其原位孢子[J];科學(xué)通報(bào);1998年18期

3 王永棟,梅盛吳;鄂西早侏羅世一種馬通科植物生殖器官的微細(xì)構(gòu)造及原位孢子特征[J];科學(xué)通報(bào);1999年04期

4 辛存林;陳世偉;都衛(wèi)東;魏明;;甘肅窯街中侏羅世Coniopteris margaretae的原位孢子與分散孢子的關(guān)系[J];地質(zhì)科技情報(bào);2011年05期

5 辛存林;孟健;魏明;陳世偉;都衛(wèi)東;;侏羅紀(jì)五種錐葉蕨植物原位孢子及其與分散孢子的關(guān)系[J];蘭州大學(xué)學(xué)報(bào)(自然科學(xué)版);2010年04期

6 鄧勝徽;遼寧鐵法盆地早白堊世植物群中的真蕨植物新材料及其原位孢子[J];地球科學(xué);1992年01期

7 楊小菊;張武;鄭少林;;遼西侏羅紀(jì)一塊有營養(yǎng)羽片、生殖羽片和原位孢子的紫萁根莖化石[J];科學(xué)通報(bào);2010年32期

8 趙立明;;山西晚石炭世硬囊蕨屬一新種及其意義[J];Journal of Integrative Plant Biology;1991年07期

9 王永棟;田寧;蔣子X;梅盛吳;;鄂西早侏羅世香溪植物群真蕨植物研究進(jìn)展[J];古生物學(xué)報(bào);2009年03期

相關(guān)會(huì)議論文 前2條

1 辛存林;孫柏年;;甘肅窯街侏羅紀(jì)幾種植物化石的原位孢子特征研究[A];中國古生物學(xué)會(huì)第十次全國會(huì)員代表大會(huì)暨第25屆學(xué)術(shù)年會(huì)——紀(jì)念中國古生物學(xué)會(huì)成立80周年論文摘要集[C];2009年

2 Gaetan Guignard;王永棟;倪慶;田寧;蔣子X;;中國湖北西部早侏羅世一種雙扇蕨科植物及其原位孢子[A];中國古生物學(xué)會(huì)第24屆學(xué)術(shù)年會(huì)論文摘要集[C];2007年

相關(guān)碩士學(xué)位論文 前1條

1 程晨;寧夏中衛(wèi)下河沿兩種晚石炭世有節(jié)類球果及其原位孢子研究[D];云南大學(xué);2012年

，

本文編號(hào)：2445366