从2001年起，在榆林红石峡飞播试验区对飞播灌木林火烧迹地进行调查研究。
It started a study on the aerial bush in Hongshixia burned area in Yulin since 2001.
由于区域干旱引发1，400英亩（566公顷）的灌木林火灾，这个燃烧的柱体就是在这期间产生的。
The fiery column was spawned during a 1,400-acre (566-hectare) brush fire triggered by regional drought.
由于区域干旱引发1，400英亩（566公顷）的灌木林火灾，这个燃烧的柱体就是在这期间产生的。
The fiery column was spawned during a 1,400-acre (566-hectare) brush fire triggered by regional drought.
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