气温变化对沙棘木蠹蛾成虫发生期的影响

The Influences of varied temperature on the occurrence period of Holcocerus hippophaecolus adults

根据宁夏彭阳2006—2011年期间沙棘木蠹蛾成虫发生期资料和2005-2011年的气象资料,分析了彭阳县每年5—9月气温变化趋势和沙棘木蠹蛾成虫发生期年变化趋势,探讨了发生期与气温之间的相关性。结果表明:2005—2011年,彭阳县平均气温、平均最高气温均呈现下降趋势,气温倾向率分别达-0.89、-0.57℃/10年,而平均最低气温呈现略微上升的趋势,气温倾向率为0.18℃/10年,但总体来说,气温的变化呈现下降的趋势,但是下降趋势不显著。沙棘木蠹蛾成虫始见期和结束期均向后推迟,发生期总体呈现加长的变化趋势。相关性分析结果表明气温降低对沙棘木蠹蛾成虫始见期的影响较大,始见期随气温的降低而推迟,平均温度下降1℃则向后推迟约9d,而历期受气温降低的影响较小,其他时期基本不受气温降低的影响。研究结果为有效控制沙棘木蠹蛾危害提供了理论依据。

In Pengyang County of Ningxia Hui Autonomous Region, the change trend of the occurrence period of Holcocerus hippophaecolus adults from May to September were analyzed by comparing the historical outdoor ob servations from 2006 to 2011 and the historical climate data from 2005 to 2011. The correlation between tempera ture and adult occurrence period was then analyzed using linear tendency method. The results showed that both mean temperature and mean maximum temperature exhibited a decline trend, and the temperature tendency rates were -0.89℃/10 year and -0.57 ℃/10 year, respectively. The mean minimum temperature exhibited a slight escalation trend, and the temperature tendency rate was 0.18 ~C/10 year. In general, the temperature change ex hibited a decline trend, but the decline trend was not significant. The initial occurrence and the terminal date of occurrence period of H. hippophaecolus adults were both postponed. The adult occurrence period generally tended to be longer. The results of correlation analysis showed that temperature declining had a great influence on the ini tial occurrence of H. hippophaecolus, and the initial occurrence tended to be delayed by the declining of tempera- ture. It was delayed by 9 days on average with the decline of 1 ℃. However, temperature declining had little in- fluence on the duration of adult occurrence period and had no influence on other periods. These data would pro vide a theoretical basis for practical control of the pest.