* Stock markets rise as Trump rolls out tax plan
* Dollar strength caps commodity gains
* LME/ShFE arb: http://bit.ly/2wZSAEz (Updates with closing prices)
LONDON, Sept 27 (Reuters) - Copper closed higher on Wednesday, clawing back some lost ground after five straight days of decline as expectations that buoyant demand would outstrip supply in the longer term tempted some buyers back to the market.
Prices were also supported by appetite for cyclical assets in the wider markets, with world stocks rising as Republicans rolled out their U.S. tax reform plan. A stronger dollar capped gains, however.
"Copper prices lost (ground) at the start of the week significantly," ABN Amro analyst Casper Burgering said. "But in the longer term, the fundamental base for the copper market is quite good.
"You see not only that demand in China is doing well, but also that in the longer term demand will increase even more from other sectors, like the electric vehicle industry. At this stage the fundamentals are very supportive of stronger prices."
* COPPER PRICES: London Metal Exchange copper closed at $6,438 a tonne, up 0.4 percent but off an earlier high of $6,491.50. Prices hit their lowest since mid-August last week at $6,366 a tonne.
* COPPER SPREADS: The cash to three-month spread on copper narrowed. It widened to the most in a decade <CMCU0-3> on Tuesday, signalling a lack of interest in spot metal.
* COPPER STOCKS: LME copper stocks <MCU-STOCKS> fell 1,600 tonnes on Tuesday, exchange data showed, while 13,350 tonnes of copper warrants were cancelled, meaning the metal had been earmarked for delivery and was no longer available to the market. Most cancellations were in Busan, South Korea.
* CHINA ECONOMY: China's economic growth probably slipped in the third quarter but was still in far better shape than last year, according to a private survey on Wednesday, which also said major risks were looming for 2018.
* FINANCIAL MARKETS: Share prices rose as Republicans in the U.S. Congress and the White House called for slashing tax rates on businesses, while rising expectations for a third U.S. interest rate rise this year lifted the dollar.
* ZINC/LEAD: LME zinc ended the day down 0.4 percent at $3,105 a tonne, extending Tuesday's 1 percent loss, while lead finished down 1 percent at $2,462 a tonne.
* NICKEL: LME nickel closed down 2.2 percent at $10,240 a tonne.
* NICKEL PREMIUMS: Premiums for nickel in Shanghai bonded warehouses surged by $55 to $295 a tonne, suggesting some short holders may be rushing to cover ahead of a Chinese holiday next week <0#BASEBW-SHMET>.
* OTHER METALS: LME tin closed little changed at $20,700, while aluminium finished 0.3 percent higher at $2,132 a tonne.
(Additional reporting by Melanie Burton in Melbourne; Editing by Mark Heinrich)