China is ordering strengthened radiation monitoring of shipments arriving at its ports in the wake of Japan's nuclear emergency.
The order was issued Wednesday from the General Administration of Quality Supervision, Inspection and Quarantine. It aims to track any goods contaminated by leaks from the nuclear plants damaged from Friday's earthquake and tsunami.
China is Japan's largest trading partner, and two-way trade rose 30 percent in 2010 over the previous year to reach $300 billion. Japan's exports to China rose 36 percent during the year to almost $150 billion.
The disasters caused damage to factories and infrastructure that is likely to significantly diminish Japan's manufacturing output.
Chinese industries are especially concerned about the cutoff of supplies of components, especially in the electronics and automobile sectors.