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Today, time and time again, we' re hearing stories of species on the move. Climate change and the great flow of human traffic around the globe means that species once isolated, are now springing up in the most unexpected places. And this mixing up of the world' s species is starting to have significant consequences. More than 40 of Britain' s wild plants are exotic species, introduced by us humans over the last thousand years. That' s sumac, not native. Not native. That' s not native, that' s not native. What' s that? That' s Sycamore, that' s not native. Yeah. I' ve come to London' s urban jungle with museum botanist Mark Spencer. We' re on the hunt for a new generation of exotic plants that are about to change the face of the British landscape. This here is the Loquat tree which is thought native to this country. It' s actually a plant from East Asia, China, Japan. It' s been grown in that part of the world for centuries. And this plant itself has actually really just been grown as an ornamental in this country for about 200 years, and never produced fruit because for many years our climate just wasn' t warm enough. So what' s different, what' s going on now, then? It' s just beginning to be able to, really, in the last ten years or so produce a lot of fruit. So for example in 2003, the really hot summer we had, I saw trees in people' s gardens in London with hundreds and hundreds of fruit. |
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jīn tiān, yī cì yòu yī cì dì, wǒ men tīng dào wù zhǒng qiān yí de xiāo xī, qì hòu biàn huà hé quán qiú dà guī mó jiāo tōng, shǐ de céng jīng zhī zài tè dìng dì qū shēng cún de shēng wù. zài chū rén yì liào de dì fāng dà sì fán yǎn, bèi dǎ luàn de shì jiè wù zhǒng fēn bù, zhèng zài yǐn fā yán jùn hòu guǒ. yīng guó chāo guò bǎi fēn zhī sì shí de yě shēng zhí wù, shì zài guò qù yī qiān nián nèi rén wéi yǐn jìn de. nà shi qī shù, fēi běn tǔ wù zhǒng, fēi běn tǔ wù zhǒng, zhè yě bú shì, nà gè yě bú shì. nà shi shén me měi guó wú tóng, fēi běn tǔ de. wǒ hé bó wù guǎn shēng wù xué jiā mǎ kè sī bīn sè yī tóng lái dào lún dūn chéng shì sēn lín xún zhǎo jí jiāng gǎi biàn yīng guó zì rán fēng guāng de xīn yī dài wài lái zhí wù zhè shì yī kē pí pá shù, tā bú shì wǒ guó běn tǔ de zhí wù. tā lái zì dōng yà guó jiā, bǐ rú zhōng guó hé rì běn, zhè zhòng shù zài dōng yà shēng zhǎng le shù shì jì, yú dà yuē liǎng bǎi nián qián bèi yǐn jìn dào yīng guó. zuò wéi guān shǎng zhí wù zhòng zhí, liǎng bǎi nián lái cóng wèi jiē shi, yīn wèi nà shí yīng guó qì hòu bù gòu wēn nuǎn. nà me xiàn zài yǒu shén me biàn huà ne? cóng dà yuē shí nián qián kāi shǐ, yīng guó de pí pá shù kāi shǐ jié chū guǒ shí. lì rú zài 2003 nián, nà gè fēi cháng yán rè de xià tiān, wǒ kàn dào lún dūn shì mín huā pǔ lǐ de pí pá shù jié le chéng bǎi shàng qiān de guǒ shí. |