Xi and German leaders will exchange views on deepening political mutual trust, expanding practical cooperation and reinforcing cooperation within the framework of the Group of 20 (G20) major economies, and discuss other regional and global issues.
Representatives for the White House did not immediately reply to a request for comment.
Climate change is a top priority for both Merkel and many German voters - the chancellor made her first mark in worldwide politics by pushing through a pre-cursor to the Kyoto Protocol.
During his stay in Germany, Xi will also travel to Hamburg to attend the G20 summit.
"That's why we must all take action together quickly", he wrote.
The White House said Trump also talked with Saudi Arabia's King Salman, Crown Prince Mohamed bin Zayed Al Nahyan of Abu Dhabi, as well as Qatari Emir Tamim bin Hamad Al Thani. He called on Gulf leaders urging them to resolve the current ongoing dispute with Qatar in a diplomatic manner.
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According to two law enforcement sources, the incident is being treated as an accident, not an act of terrorism. A police spokesperson was not immediately available to respond to a request for further information.
The four countries have accused Qatar of promoting terrorism in the region and have demanded Qatar shut down the Al Jazeera television network, evict Turkish troops from Qatar, and curb its ties with Iran.
The visit, a month after Chinese Premier Li Keqiang traveled to Berlin to meet Merkel, comes at an extremely sensitive time for big-power relations.
Russian Federation and the United States are still discussing the timing of the encounter between Mr Trump and Mr Putin, according to a Kremlin aide.
"A meeting is planned with the american president before the start of the G20 summit, most likely on Thursday in the early evening", said to the press Steffen Seibert.
Germany and China are expected to take up more of the leadership role long held by the United States at the upcoming Group of 20 (G-20) meeting, Bloomberg reported Monday.