chinas foreignexchange reserves rose in january official data showed tuesday amid a weakening us dollar the reserves rose by 568 billion from a month earlier to 3184 trillion said the state administration of foreign exchange the rise was wider than the 26 billion increase expected by economists polled by the wall street journal economists said the increase might have come from the sizable capital inflow into chinas stock market and a weakening us dollar that could have inflated nondollar assets in the reserves the foreign exchange regulator said in an online statement that chinas economic recovery is sustainable which could stabilize the nations foreign exchange