作 者: ;
机构地区: 兰州大学生命科学学院干旱农业生态国家重点实验室
出 处: 《干旱区资源与环境》 1996年第3期56-62,共7页
摘 要: 春旱使春小麦营养生长滞后,提前进入生殖生长,抽穗率降低,退化小穗的比例增加,造成大幅度减产。从春小麦的水分生态位适宜度看,五月上、中旬为水分伤害的第一个阈值点,五月下旬至六月初为水分伤害的第二个阈值点。后者是常住的。 In the area where this research was conducted,spring drought caused wheat to delay vegetative growth,to advance reproductive growth,to decrease heading rate and to increase degenerated ears. So the production greatly reduced. According to spring wheat's water niche suitability,the first half of May is the first damage threshold of water stress,and the period of time from the last ten days of May to the early June is the second one.