中新网兰州7月15日电 (鲁蓉 郭海霞)盛夏时节，凌晨三点，甘肃省庆阳市环县环城镇龚淌村的田垄间已亮起零星光束。60岁的董凤龙和老伴佩戴头灯，腰系编织袋，在齐腰深的黄花菜地里摸索前行。手指对准花苞根部，一捏一折，“咯嘣”一声脆响，一根饱含水分的鲜黄花落入袋中。
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