BEIJING, Apr. 1-- Chinese manufacturing business activity rebounded slightly in March to expansion territory, official data showed on Wednesday.

The manufacturing purchasing managers' index (PMI), a key measure of factory activity in China, posted at 50.1 in March, up from 49.9 in the previous month, according to the data released by the National Bureau of Statistics and the China Federation of Logistics and Purchasing.

A reading above 50 indicates expansion, while a reading below 50 represents contraction.