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2013-10-20 09:15|鿴:4171|:0|:С

OȺָһԶݵʱУһΧڣڶͻȻӶʱͻȻ½

 

OȺҪĸ

 

1.ֵﵽʵľֵ

 

2.ȣȫΧڵĹȡ

 

3.ȣ漰㷺IJͬ൥Ԫ

 

4.ʱԶݵĵʱ

 

OȺֵ

 

OȺֵ

 

OȺĿԭܶ࣬ײɽůˣƽ½ȱȶѧĿǰδȫĶۡÿδ¼Զʱ80-90ϵǣǿֱܹɵļ˶ӵĻرѶͬʱֱĻ仯ҲֵĵͻڼҴĺ¼ʼպͷչݻƪ£ÿȫԵ¼󣬶ĸպͷչ

 

̫ԪӦҲд¼ʱԾΪȱʯ¼ݻʯ¼5δOȺ¼ռĩڡĩڡĩڡĩںѼĩڵģѼ-¼ܵע¼ȴǹģ漰ȺࡢӰΪԶһΡϴ¼ܶ20ϡ

 

δ¼

 

±г5Ҫ¼,պͽܿˡ˹1982귢ı㷺ΪҪ¼

 

1.ռ-־¼ӢOrdovicianCSilurian extinction eventڰռڻռ־ʱڡ4.50ǰ4.40ǰ27%Ŀ57%ֵ֡Ϊδ¼ĵڶλֱԭǸɴ½ϼӰȫ仯ȫ仯밲˹-ʱ½

 

2.ͺ¼ӢLate Devonian extinction3.75ǰ3.60ǰӽ-ʯ̿ʱڡ Ҫ½Ӱ첻19%Ŀơ50%δ¼˽2000꣬ڼж߷ڡ콸ʧʯࡢ3Ŀɺ10ƿɪ¼ҲƸ˹-¼¼ʱܳԴѱʶܵѧԭڴǰ½ֲµӡ̼Ĵ٣뿨³ʱ¡½ֲĸϵر֮ף½ʯԪͷŽرˮˮϵĸӪ󱩷˺ȱ¼ķʢлijʹȫ̼ѭĶ̼뺣׳㣬Ҳǿ˵仯Ҳ½ɴúʱڣҲӾ˶̼̻ʯȦ

 

3. 2.51ǰĶ-͹ʱڡϷģ¼දĿĿȫձֲȺĩȫʢҶȫʧԭ40ʱȫȻ޴档ʯ10ƾͬڴԼ140޼ܹ57%Ŀơ83% (53%ĺĿơ84%ĺԼ96%ĺ֣70%½ˡֲӰϲȷ˴ֲȺռơȫ缸ûڵúγɡδ¼Ŀܳģ緢ɵĸdzȼڻͷ̹Ŵ½γɺı˵ϵͳȵȡ

 

4.-٪޼¼ 2.0ǰ-٪޼ʱڡ23%Ŀ48%ˡԭ޶ۡ

 

5.Ѽ-¼ (дΪK-T): 6ǧ5ǰԼ17%Ŀơ50%75%ˡһΪīȿ̹뵺ʯײ

 

δ

 

Ŀȫ¼

 

δֳȫ¼ֽȫ㷺OȺ¼漰ȺֲPĿƣ粸鶯ࡢࡢжP֫󲿷ڷ15002006꣬Ȼг784֡кܶʵֶûм¼һЩѧҹ20ͣ2-200ʵ߹ƣÿд14

 

ֽٶȹǵݻƽٶȵ100ͶȺһֱ21ִ͡¼ɵֱӰ졣

 

˵ȫ¼ɰ-ȫ֮ļ¼Ʊʱ¼һǰ෢չɢʼɾͶȺʧǴ¼Դת˿ࡣȫ¼ֽ21͡

 

ϴģ¼

 

¼Լδ¼֮⣬¹ģС¼

 

ʱʱʼʱ¼ʱԭ
258.8ǰļ¼647.4Լ1.3ǰŮľ¼1.3ǰӡŴаͻɽ7.4ǰ ʯɽӢLava Creek Tuff64ǰȲɱ ı䣿
530ǰӢPlioceneCPleistocene boundary marine extinction200ǰЫ-ЭOBЭ
2300ǰ¼ӢMiddle Miocene disruption1450ǰ
Ž6500ǰʼ-¼3390ǰɽƤͲƤʯСӰ죿
Ѽ1.45ǰյڽ¼1.17ǰӡϼRajmahal Traps ɽӢRajmahal Traps
٪޼ĩ¼ӢEnd-Jurassic extinction1.455ǰ»ɽ
٪޼2.013ǰа¼1.83ǰ³-ӢKaroo-Ferrarɽ
2.522ǰ¼ӢCarnian Pluvial Evet2.32ǰӢFlood basalt¼
2.989ǰ¶ɭ¼ӢOlson's Extinction2.7ǰ
ʯ̿3.589ǰʯֱ̿¼ӢCarboniferous Rainforest Collapse3.18ǰ仯ĴأʯӢWoodleigh crater
־ĩ¼ӢEnd-Silurian extinction event4.16ǰ
ͽ¼ӢLau event4.2ǰ

¶½¼

4.24ǰȫƽ½
־4.434ǰάϼ¼ӢIreviken event4.28ǰȱ
-ռ¼4.88ǰڣӢAnoxic event
˹¼ӢDresbachian extinction5.02ǰ
5.42ǰĩ¼ӢEnd-Botomian_mass extinction5.17ǰ
Ͽ6.2ǰϿĩ¼5.42ǰȱ? ɱֵѩ¼?

 

ݻϵҪ

 

¼ʱӿݻΪ¼ʱʹԭ̬ռƵQ˥𣬴ӶΪµķչṩ˸ռһ̬ϵͳУµȡ֣״š

 

磬벸鶯ڿռƵʱڼѴڣ޷ͼ׵̬λѼͣ¼˷ʹ鶯ܹͼ׵̬λǴߣΪ-٪޼¼ҪľǶ

 

һֹ۵˵Ԥн϶־̬֮λϲڴҴ档Ϊڴʱľұ仯ʹԭһЩܹøάһȶ״ھʱɸ

 

ߣڴҴֲδָԭȵԣ½ƣʱ"Խߵ"ˣ "ЩҴ"ķʽijδĻʧƫġ

 

Ȼȴּ֣ľʳռľݻڻı仯ҪڡԴʼһбʾSpecies are produced and exterminaTED by slowly acting causes...and the most import of all causes of organic change is one which is almost independent of altered...physical conditions, namely the mutual relation of organism to organism-the improvement of one organism entailing the improvement or extermination of others

 

 

ѧΪ¼ķԣԼÿ26003000֮䣬ߴԼÿ6200һЩ仯ڴ಻ͬĽ̫ܴͣһδ֪İǣī˹̫ϵڴֱϵ淽УߴԽϵۡ

 

ȻѧΪе¼δԵļ裬Ǹ̬ϵ𽥴ﵽһضٽ㣬ʹķòɱ⡣⣬Լ˵ܵɡ֧Ƹּ¼нǿ֤ʾķԣҷԵĵʻѧһµԡ



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