Abstract: Based on the 527 meteorological stations observation data as well as the diseases and pests data and planted crop areas data in China agricultural areas in 1961-2010, and by the method of correlation analysis, this paper analyzed the effects of the changes of meteorological elements on the occurrence of insect pests. Under the background of climate change, the mean annual air temperature and mean precipitation intensity increased at a rate of 0.27 ℃·10 a^-1 and 0.24 mm·(d·10 a)^-1, respectively, while the annual sunshine hours decreased at a rate of 47.40 h·10 a^-1. The annual precipitation intensity increased at a rate of 0.14 mm·10 a^-1, but had great fluctuations. There were significant positive correlations between the rate anomaly of insect pests’ occurrence area and that of mean annual air temperature and precipitation intensity. When the mean annual air temperature increased by 1 ℃, the increasing rate of insect pests’ occurrence area would be 0.648, and the occurrence area would be increased by 0.96×10⁸ hm²·time; when the mean annual precipitation intensity increased by 1 mm·d^-1, the increasing rate of insect pests’ occurrence area would be 0.713, and the occurrence area would be increased by 1.06×10⁸ hm²·time. The rate anomaly of insect pests’ occurrence area had a significant negative correlation with that of annual sunshine hours. When the annual sunshine hours decreased by 100 h, the rate anomaly of insect pests’ occurrence area would be increased by 040, and the occurrence area would be increased by 0.59×10⁸hm² ·time. Overall, the rate anomaly of insect pests’ occurrence area had little correlation with that of annual precipitation, but significant negative correlations with the rate anomaly of mean annual small precipitation, days of microprecipitation, and days of small precipitation. When the mean annual small precipitation, days of microprecipitation, and days of small precipitation decreased by 1 mm, 1 d, and 1 d, the rate anomaly of insect pests’ occurrence area would be increased by 0.014, 0.066 and 0.052, and the occurrence area would be increased by 0.02×10⁸, 0.10×10⁸, and 0.08×10⁸ hm²·time, respectively.

Key words: microbial biomass carbon, phospholipid fatty acid, grazing style.