user: ### NOW ANSWER:
Question: What is the district when prevailing types, % is Acer negundo — 30.22 Tilia — 18.6 Poplar — 15.23?
Columns: ['District', 'Total amount of trees', 'Prevailing types, %', 'Amount of old trees', 'Amount of trees, that require replacement']
Types: ['text', 'real', 'text', 'text', 'text']
Sample row: ['Kirovsky', 188497.0, 'Pine — 29.37 Poplar — 26.12 Acer negundo — 13.2', '98,374 (52.18%)', '2,322 (2.36%)']
SQL:

assistant: SELECT "District" FROM "Table" WHERE "Prevailing types, %" = 'Acer negundo — 30.22 Tilia — 18.6 Poplar — 15.23';