青藏高原高寒草甸气温、降水和地上净初级生产力变化的周期特征

依据中国科学院海北高寒草甸生态系统定位站1980—2007共28年的气温、降水和地上净初级生产力数据，采用墨西哥小帽母函数对其进行周期特征的小波分析.结果表明:气温、降水和地上净初级生产力均存在13年的主要周期，但气温和地上净初级生产力的次要周期(均为2年)对其年际变化的影响较小，而降水次要周期(4年)的影响较大.三者的滞后相关分析发现,地上净初级生产力的变化在20年时间尺度上主要受控于气温，且对后者存在5～9年较弱的延迟效应;而与降水的关系较小.

Periodic fluctuation features of air temperature, precipitation, and aboveground net primary production of alpine meadow ecosystem on Qinghai-Tibetan Plateau.

With Mexican Hat function as mother function, a wavelet analysis was conducted on the periodic fluctuation features of air temperature, precipitation, and aboveground net primary production (ANPP) in the Alpine Meadow Ecosystem Research Station, Chinese Academy of Sciences from 1980 to 2007. The results showed that there was a main period of 13 years for the annual fluctuations of air temperature, precipitation, and ANPP. A secondary period of 2 years for the annual fluctuations of air temperature and ANPP had lesser influence, whereas that of 4 years for the annual fluctuation of precipitation had greater effect. Lagged correlation analysis indicated that the annual fluctuation of ANNP was mainly controlled by the air temperature in a 20 years scale and had a weak 5〖KG-*2〗-〖KG-*7〗9 years lag effect, but there was a less correlation between ANPP and precipitation.